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Posted to commits@hbase.apache.org by st...@apache.org on 2013/04/06 08:06:09 UTC
svn commit: r1465198 [20/41] - in /hbase/hbase.apache.org/trunk: ./ css/
hbase-assembly/ images/ xref-test/ xref-test/org/apache/hadoop/hbase/
xref-test/org/apache/hadoop/hbase/client/
xref-test/org/apache/hadoop/hbase/client/replication/ xref-test/org...
Modified: hbase/hbase.apache.org/trunk/xref/org/apache/hadoop/hbase/client/HConnectionManager.html
URL: http://svn.apache.org/viewvc/hbase/hbase.apache.org/trunk/xref/org/apache/hadoop/hbase/client/HConnectionManager.html?rev=1465198&r1=1465197&r2=1465198&view=diff
==============================================================================
--- hbase/hbase.apache.org/trunk/xref/org/apache/hadoop/hbase/client/HConnectionManager.html (original)
+++ hbase/hbase.apache.org/trunk/xref/org/apache/hadoop/hbase/client/HConnectionManager.html Sat Apr 6 06:06:07 2013
@@ -105,2455 +105,2585 @@
<a class="jxr_linenumber" name="95" href="#95">95</a> <strong class="jxr_keyword">import</strong> org.apache.hadoop.ipc.RemoteException;
<a class="jxr_linenumber" name="96" href="#96">96</a> <strong class="jxr_keyword">import</strong> org.apache.zookeeper.KeeperException;
<a class="jxr_linenumber" name="97" href="#97">97</a>
-<a class="jxr_linenumber" name="98" href="#98">98</a> <strong class="jxr_keyword">import</strong> com.google.protobuf.ServiceException;
-<a class="jxr_linenumber" name="99" href="#99">99</a>
-<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * A non-instantiable class that manages {@link HConnection}s.</em>
-<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * This class has a static Map of {@link HConnection} instances keyed by</em>
-<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * {@link Configuration}; all invocations of {@link #getConnection(Configuration)}</em>
-<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * that pass the same {@link Configuration} instance will be returned the same</em>
-<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * {@link HConnection} instance (Adding properties to a Configuration</em>
-<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * instance does not change its object identity). Sharing {@link HConnection}</em>
-<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment"> * instances is usually what you want; all clients of the {@link HConnection}</em>
-<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * instances share the HConnections' cache of Region locations rather than each</em>
-<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * having to discover for itself the location of meta, etc. It makes</em>
-<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * sense for the likes of the pool of HTables class {@link HTablePool}, for</em>
-<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * instance (If concerned that a single {@link HConnection} is insufficient</em>
-<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * for sharing amongst clients in say an heavily-multithreaded environment,</em>
-<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * in practise its not proven to be an issue. Besides, {@link HConnection} is</em>
-<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * implemented atop Hadoop RPC and as of this writing, Hadoop RPC does a</em>
-<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> * connection per cluster-member, exclusively).</em>
-<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment"> * <p>But sharing connections</em>
-<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment"> * makes clean up of {@link HConnection} instances a little awkward. Currently,</em>
-<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment"> * clients cleanup by calling</em>
-<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment"> * {@link #deleteConnection(Configuration)}. This will shutdown the</em>
-<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment"> * zookeeper connection the HConnection was using and clean up all</em>
-<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment"> * HConnection resources as well as stopping proxies to servers out on the</em>
-<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * cluster. Not running the cleanup will not end the world; it'll</em>
-<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment"> * just stall the closeup some and spew some zookeeper connection failed</em>
-<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment"> * messages into the log. Running the cleanup on a {@link HConnection} that is</em>
-<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment"> * subsequently used by another will cause breakage so be careful running</em>
-<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * cleanup.</em>
-<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * <p>To create a {@link HConnection} that is not shared by others, you can</em>
-<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment"> * create a new {@link Configuration} instance, pass this new instance to</em>
-<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment"> * {@link #getConnection(Configuration)}, and then when done, close it up by</em>
-<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment"> * doing something like the following:</em>
-<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment"> * <pre></em>
-<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment"> * {@code</em>
-<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment"> * Configuration newConfig = new Configuration(originalConf);</em>
-<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment"> * HConnection connection = HConnectionManager.getConnection(newConfig);</em>
-<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment"> * // Use the connection to your hearts' delight and then when done...</em>
-<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment"> * HConnectionManager.deleteConnection(newConfig, true);</em>
-<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment"> * }</em>
-<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment"> * </pre></em>
-<a class="jxr_linenumber" name="140" href="#140">140</a> <em class="jxr_javadoccomment"> * <p>Cleanup used to be done inside in a shutdown hook. On startup we'd</em>
-<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment"> * register a shutdown hook that called {@link #deleteAllConnections()}</em>
-<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment"> * on its way out but the order in which shutdown hooks run is not defined so</em>
-<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment"> * were problematic for clients of HConnection that wanted to register their</em>
-<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment"> * own shutdown hooks so we removed ours though this shifts the onus for</em>
-<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment"> * cleanup to the client.</em>
-<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="147" href="#147">147</a> @SuppressWarnings(<span class="jxr_string">"serial"</span>)
-<a class="jxr_linenumber" name="148" href="#148">148</a> @InterfaceAudience.Public
-<a class="jxr_linenumber" name="149" href="#149">149</a> @InterfaceStability.Evolving
-<a class="jxr_linenumber" name="150" href="#150">150</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionManager</a> {
-<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_comment">// An LRU Map of HConnectionKey -> HConnection (TableServer). All</em>
-<a class="jxr_linenumber" name="152" href="#152">152</a> <em class="jxr_comment">// access must be synchronized. This map is not private because tests</em>
-<a class="jxr_linenumber" name="153" href="#153">153</a> <em class="jxr_comment">// need to be able to tinker with it.</em>
-<a class="jxr_linenumber" name="154" href="#154">154</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Map<HConnectionKey, HConnectionImplementation> HBASE_INSTANCES;
-<a class="jxr_linenumber" name="155" href="#155">155</a>
-<a class="jxr_linenumber" name="156" href="#156">156</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MAX_CACHED_HBASE_INSTANCES;
-<a class="jxr_linenumber" name="157" href="#157">157</a>
-<a class="jxr_linenumber" name="158" href="#158">158</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Parameter name for what client protocol to use. */</em>
-<a class="jxr_linenumber" name="159" href="#159">159</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String CLIENT_PROTOCOL_CLASS = <span class="jxr_string">"hbase.clientprotocol.class"</span>;
-<a class="jxr_linenumber" name="160" href="#160">160</a>
-<a class="jxr_linenumber" name="161" href="#161">161</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Default client protocol class name. */</em>
-<a class="jxr_linenumber" name="162" href="#162">162</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_CLIENT_PROTOCOL_CLASS = ClientProtocol.<strong class="jxr_keyword">class</strong>.getName();
-<a class="jxr_linenumber" name="163" href="#163">163</a>
-<a class="jxr_linenumber" name="164" href="#164">164</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Parameter name for what admin protocol to use. */</em>
-<a class="jxr_linenumber" name="165" href="#165">165</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String REGION_PROTOCOL_CLASS = <span class="jxr_string">"hbase.adminprotocol.class"</span>;
-<a class="jxr_linenumber" name="166" href="#166">166</a>
-<a class="jxr_linenumber" name="167" href="#167">167</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Default admin protocol class name. */</em>
-<a class="jxr_linenumber" name="168" href="#168">168</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_ADMIN_PROTOCOL_CLASS = AdminProtocol.<strong class="jxr_keyword">class</strong>.getName();
-<a class="jxr_linenumber" name="169" href="#169">169</a>
-<a class="jxr_linenumber" name="170" href="#170">170</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Log LOG = LogFactory.getLog(HConnectionManager.<strong class="jxr_keyword">class</strong>);
-<a class="jxr_linenumber" name="171" href="#171">171</a>
-<a class="jxr_linenumber" name="172" href="#172">172</a> <strong class="jxr_keyword">static</strong> {
-<a class="jxr_linenumber" name="173" href="#173">173</a> <em class="jxr_comment">// We set instances to one more than the value specified for {@link</em>
-<a class="jxr_linenumber" name="174" href="#174">174</a> <em class="jxr_comment">// HConstants#ZOOKEEPER_MAX_CLIENT_CNXNS}. By default, the zk default max</em>
-<a class="jxr_linenumber" name="175" href="#175">175</a> <em class="jxr_comment">// connections to the ensemble from the one client is 30, so in that case we</em>
-<a class="jxr_linenumber" name="176" href="#176">176</a> <em class="jxr_comment">// should run into zk issues before the LRU hit this value of 31.</em>
-<a class="jxr_linenumber" name="177" href="#177">177</a> MAX_CACHED_HBASE_INSTANCES = HBaseConfiguration.create().getInt(
-<a class="jxr_linenumber" name="178" href="#178">178</a> HConstants.ZOOKEEPER_MAX_CLIENT_CNXNS,
-<a class="jxr_linenumber" name="179" href="#179">179</a> HConstants.DEFAULT_ZOOKEPER_MAX_CLIENT_CNXNS) + 1;
-<a class="jxr_linenumber" name="180" href="#180">180</a> HBASE_INSTANCES = <strong class="jxr_keyword">new</strong> LinkedHashMap<HConnectionKey, HConnectionImplementation>(
-<a class="jxr_linenumber" name="181" href="#181">181</a> (<strong class="jxr_keyword">int</strong>) (MAX_CACHED_HBASE_INSTANCES / 0.75F) + 1, 0.75F, <strong class="jxr_keyword">true</strong>) {
-<a class="jxr_linenumber" name="182" href="#182">182</a> @Override
-<a class="jxr_linenumber" name="183" href="#183">183</a> <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> removeEldestEntry(
-<a class="jxr_linenumber" name="184" href="#184">184</a> Map.Entry<HConnectionKey, HConnectionImplementation> eldest) {
-<a class="jxr_linenumber" name="185" href="#185">185</a> <strong class="jxr_keyword">return</strong> size() > MAX_CACHED_HBASE_INSTANCES;
-<a class="jxr_linenumber" name="186" href="#186">186</a> }
-<a class="jxr_linenumber" name="187" href="#187">187</a> };
-<a class="jxr_linenumber" name="188" href="#188">188</a> }
-<a class="jxr_linenumber" name="189" href="#189">189</a>
-<a class="jxr_linenumber" name="190" href="#190">190</a> <em class="jxr_comment">/*</em>
-<a class="jxr_linenumber" name="191" href="#191">191</a> <em class="jxr_comment"> * Non-instantiable.</em>
-<a class="jxr_linenumber" name="192" href="#192">192</a> <em class="jxr_comment"> */</em>
-<a class="jxr_linenumber" name="193" href="#193">193</a> <strong class="jxr_keyword">protected</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionManager</a>() {
-<a class="jxr_linenumber" name="194" href="#194">194</a> <strong class="jxr_keyword">super</strong>();
-<a class="jxr_linenumber" name="195" href="#195">195</a> }
-<a class="jxr_linenumber" name="196" href="#196">196</a>
-<a class="jxr_linenumber" name="197" href="#197">197</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="198" href="#198">198</a> <em class="jxr_javadoccomment"> * Get the connection that goes with the passed <code>conf</code></em>
-<a class="jxr_linenumber" name="199" href="#199">199</a> <em class="jxr_javadoccomment"> * configuration instance.</em>
-<a class="jxr_linenumber" name="200" href="#200">200</a> <em class="jxr_javadoccomment"> * If no current connection exists, method creates a new connection for the</em>
-<a class="jxr_linenumber" name="201" href="#201">201</a> <em class="jxr_javadoccomment"> * passed <code>conf</code> instance.</em>
-<a class="jxr_linenumber" name="202" href="#202">202</a> <em class="jxr_javadoccomment"> * @param conf configuration</em>
-<a class="jxr_linenumber" name="203" href="#203">203</a> <em class="jxr_javadoccomment"> * @return HConnection object for <code>conf</code></em>
-<a class="jxr_linenumber" name="204" href="#204">204</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
-<a class="jxr_linenumber" name="205" href="#205">205</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="206" href="#206">206</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> getConnection(Configuration conf)
-<a class="jxr_linenumber" name="207" href="#207">207</a> <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="208" href="#208">208</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a> connectionKey = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a>(conf);
-<a class="jxr_linenumber" name="209" href="#209">209</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
-<a class="jxr_linenumber" name="210" href="#210">210</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a> connection = HBASE_INSTANCES.get(connectionKey);
-<a class="jxr_linenumber" name="211" href="#211">211</a> <strong class="jxr_keyword">if</strong> (connection == <strong class="jxr_keyword">null</strong>) {
-<a class="jxr_linenumber" name="212" href="#212">212</a> connection = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a>(conf, <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="213" href="#213">213</a> HBASE_INSTANCES.put(connectionKey, connection);
-<a class="jxr_linenumber" name="214" href="#214">214</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (connection.isClosed()) {
-<a class="jxr_linenumber" name="215" href="#215">215</a> HConnectionManager.deleteConnection(connectionKey, <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="216" href="#216">216</a> connection = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a>(conf, <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="217" href="#217">217</a> HBASE_INSTANCES.put(connectionKey, connection);
-<a class="jxr_linenumber" name="218" href="#218">218</a> }
-<a class="jxr_linenumber" name="219" href="#219">219</a> connection.incCount();
-<a class="jxr_linenumber" name="220" href="#220">220</a> <strong class="jxr_keyword">return</strong> connection;
-<a class="jxr_linenumber" name="221" href="#221">221</a> }
-<a class="jxr_linenumber" name="222" href="#222">222</a> }
-<a class="jxr_linenumber" name="223" href="#223">223</a>
-<a class="jxr_linenumber" name="224" href="#224">224</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="225" href="#225">225</a> <em class="jxr_javadoccomment"> * Create a new HConnection instance using the passed <code>conf</code></em>
-<a class="jxr_linenumber" name="226" href="#226">226</a> <em class="jxr_javadoccomment"> * instance.</em>
-<a class="jxr_linenumber" name="227" href="#227">227</a> <em class="jxr_javadoccomment"> * Note: This bypasses the usual HConnection life cycle management!</em>
-<a class="jxr_linenumber" name="228" href="#228">228</a> <em class="jxr_javadoccomment"> * Use this with caution, the caller is responsible for closing the</em>
-<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_javadoccomment"> * created connection.</em>
-<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_javadoccomment"> * @param conf configuration</em>
-<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment"> * @return HConnection object for <code>conf</code></em>
-<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
-<a class="jxr_linenumber" name="233" href="#233">233</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="234" href="#234">234</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> createConnection(Configuration conf)
-<a class="jxr_linenumber" name="235" href="#235">235</a> <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="236" href="#236">236</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a>(conf, false);
-<a class="jxr_linenumber" name="237" href="#237">237</a> }
-<a class="jxr_linenumber" name="238" href="#238">238</a>
-<a class="jxr_linenumber" name="239" href="#239">239</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="240" href="#240">240</a> <em class="jxr_javadoccomment"> * Delete connection information for the instance specified by configuration.</em>
-<a class="jxr_linenumber" name="241" href="#241">241</a> <em class="jxr_javadoccomment"> * If there are no more references to it, this will then close connection to</em>
-<a class="jxr_linenumber" name="242" href="#242">242</a> <em class="jxr_javadoccomment"> * the zookeeper ensemble and let go of all resources.</em>
-<a class="jxr_linenumber" name="243" href="#243">243</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="244" href="#244">244</a> <em class="jxr_javadoccomment"> * @param conf</em>
-<a class="jxr_linenumber" name="245" href="#245">245</a> <em class="jxr_javadoccomment"> * configuration whose identity is used to find {@link HConnection}</em>
-<a class="jxr_linenumber" name="246" href="#246">246</a> <em class="jxr_javadoccomment"> * instance.</em>
-<a class="jxr_linenumber" name="247" href="#247">247</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="248" href="#248">248</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteConnection(Configuration conf) {
-<a class="jxr_linenumber" name="249" href="#249">249</a> deleteConnection(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a>(conf), false);
-<a class="jxr_linenumber" name="250" href="#250">250</a> }
-<a class="jxr_linenumber" name="251" href="#251">251</a>
-<a class="jxr_linenumber" name="252" href="#252">252</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="253" href="#253">253</a> <em class="jxr_javadoccomment"> * Delete stale connection information for the instance specified by configuration.</em>
-<a class="jxr_linenumber" name="254" href="#254">254</a> <em class="jxr_javadoccomment"> * This will then close connection to</em>
-<a class="jxr_linenumber" name="255" href="#255">255</a> <em class="jxr_javadoccomment"> * the zookeeper ensemble and let go of all resources.</em>
-<a class="jxr_linenumber" name="256" href="#256">256</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="257" href="#257">257</a> <em class="jxr_javadoccomment"> * @param connection</em>
-<a class="jxr_linenumber" name="258" href="#258">258</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="259" href="#259">259</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteStaleConnection(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) {
-<a class="jxr_linenumber" name="260" href="#260">260</a> deleteConnection(connection, <strong class="jxr_keyword">true</strong>);
-<a class="jxr_linenumber" name="261" href="#261">261</a> }
-<a class="jxr_linenumber" name="262" href="#262">262</a>
-<a class="jxr_linenumber" name="263" href="#263">263</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="264" href="#264">264</a> <em class="jxr_javadoccomment"> * Delete information for all connections.</em>
-<a class="jxr_linenumber" name="265" href="#265">265</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="266" href="#266">266</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteAllConnections() {
-<a class="jxr_linenumber" name="267" href="#267">267</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
-<a class="jxr_linenumber" name="268" href="#268">268</a> Set<HConnectionKey> connectionKeys = <strong class="jxr_keyword">new</strong> HashSet<HConnectionKey>();
-<a class="jxr_linenumber" name="269" href="#269">269</a> connectionKeys.addAll(HBASE_INSTANCES.keySet());
-<a class="jxr_linenumber" name="270" href="#270">270</a> <strong class="jxr_keyword">for</strong> (HConnectionKey connectionKey : connectionKeys) {
-<a class="jxr_linenumber" name="271" href="#271">271</a> deleteConnection(connectionKey, false);
-<a class="jxr_linenumber" name="272" href="#272">272</a> }
-<a class="jxr_linenumber" name="273" href="#273">273</a> HBASE_INSTANCES.clear();
-<a class="jxr_linenumber" name="274" href="#274">274</a> }
-<a class="jxr_linenumber" name="275" href="#275">275</a> }
-<a class="jxr_linenumber" name="276" href="#276">276</a>
-<a class="jxr_linenumber" name="277" href="#277">277</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteConnection(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection, <strong class="jxr_keyword">boolean</strong> staleConnection) {
-<a class="jxr_linenumber" name="278" href="#278">278</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
-<a class="jxr_linenumber" name="279" href="#279">279</a> <strong class="jxr_keyword">for</strong> (Entry<HConnectionKey, HConnectionImplementation> connectionEntry : HBASE_INSTANCES
-<a class="jxr_linenumber" name="280" href="#280">280</a> .entrySet()) {
-<a class="jxr_linenumber" name="281" href="#281">281</a> <strong class="jxr_keyword">if</strong> (connectionEntry.getValue() == connection) {
-<a class="jxr_linenumber" name="282" href="#282">282</a> deleteConnection(connectionEntry.getKey(), staleConnection);
-<a class="jxr_linenumber" name="283" href="#283">283</a> <strong class="jxr_keyword">break</strong>;
-<a class="jxr_linenumber" name="284" href="#284">284</a> }
-<a class="jxr_linenumber" name="285" href="#285">285</a> }
-<a class="jxr_linenumber" name="286" href="#286">286</a> }
-<a class="jxr_linenumber" name="287" href="#287">287</a> }
-<a class="jxr_linenumber" name="288" href="#288">288</a>
-<a class="jxr_linenumber" name="289" href="#289">289</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteConnection(<a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a> connectionKey, <strong class="jxr_keyword">boolean</strong> staleConnection) {
-<a class="jxr_linenumber" name="290" href="#290">290</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
-<a class="jxr_linenumber" name="291" href="#291">291</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a> connection = HBASE_INSTANCES
-<a class="jxr_linenumber" name="292" href="#292">292</a> .get(connectionKey);
-<a class="jxr_linenumber" name="293" href="#293">293</a> <strong class="jxr_keyword">if</strong> (connection != <strong class="jxr_keyword">null</strong>) {
-<a class="jxr_linenumber" name="294" href="#294">294</a> connection.decCount();
-<a class="jxr_linenumber" name="295" href="#295">295</a> <strong class="jxr_keyword">if</strong> (connection.isZeroReference() || staleConnection) {
-<a class="jxr_linenumber" name="296" href="#296">296</a> HBASE_INSTANCES.remove(connectionKey);
-<a class="jxr_linenumber" name="297" href="#297">297</a> connection.internalClose();
-<a class="jxr_linenumber" name="298" href="#298">298</a> }
-<a class="jxr_linenumber" name="299" href="#299">299</a> } <strong class="jxr_keyword">else</strong> {
-<a class="jxr_linenumber" name="300" href="#300">300</a> LOG.error(<span class="jxr_string">"Connection not found in the list, can't delete it "</span>+
-<a class="jxr_linenumber" name="301" href="#301">301</a> <span class="jxr_string">"(connection key="</span>+connectionKey+<span class="jxr_string">"). May be the key was modified?"</span>);
-<a class="jxr_linenumber" name="302" href="#302">302</a> }
-<a class="jxr_linenumber" name="303" href="#303">303</a> }
-<a class="jxr_linenumber" name="304" href="#304">304</a> }
-<a class="jxr_linenumber" name="305" href="#305">305</a>
-<a class="jxr_linenumber" name="306" href="#306">306</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="307" href="#307">307</a> <em class="jxr_javadoccomment"> * It is provided for unit test cases which verify the behavior of region</em>
-<a class="jxr_linenumber" name="308" href="#308">308</a> <em class="jxr_javadoccomment"> * location cache prefetch.</em>
-<a class="jxr_linenumber" name="309" href="#309">309</a> <em class="jxr_javadoccomment"> * @return Number of cached regions for the table.</em>
-<a class="jxr_linenumber" name="310" href="#310">310</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
-<a class="jxr_linenumber" name="311" href="#311">311</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="312" href="#312">312</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> getCachedRegionCount(Configuration conf,
-<a class="jxr_linenumber" name="313" href="#313">313</a> <strong class="jxr_keyword">final</strong> byte[] tableName)
-<a class="jxr_linenumber" name="314" href="#314">314</a> <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="315" href="#315">315</a> <strong class="jxr_keyword">return</strong> execute(<strong class="jxr_keyword">new</strong> HConnectable<Integer>(conf) {
-<a class="jxr_linenumber" name="316" href="#316">316</a> @Override
-<a class="jxr_linenumber" name="317" href="#317">317</a> <strong class="jxr_keyword">public</strong> Integer connect(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) {
-<a class="jxr_linenumber" name="318" href="#318">318</a> <strong class="jxr_keyword">return</strong> ((HConnectionImplementation) connection)
-<a class="jxr_linenumber" name="319" href="#319">319</a> .getNumberOfCachedRegionLocations(tableName);
-<a class="jxr_linenumber" name="320" href="#320">320</a> }
-<a class="jxr_linenumber" name="321" href="#321">321</a> });
-<a class="jxr_linenumber" name="322" href="#322">322</a> }
-<a class="jxr_linenumber" name="323" href="#323">323</a>
-<a class="jxr_linenumber" name="324" href="#324">324</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="325" href="#325">325</a> <em class="jxr_javadoccomment"> * It's provided for unit test cases which verify the behavior of region</em>
-<a class="jxr_linenumber" name="326" href="#326">326</a> <em class="jxr_javadoccomment"> * location cache prefetch.</em>
-<a class="jxr_linenumber" name="327" href="#327">327</a> <em class="jxr_javadoccomment"> * @return true if the region where the table and row reside is cached.</em>
-<a class="jxr_linenumber" name="328" href="#328">328</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
-<a class="jxr_linenumber" name="329" href="#329">329</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="330" href="#330">330</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isRegionCached(Configuration conf,
-<a class="jxr_linenumber" name="331" href="#331">331</a> <strong class="jxr_keyword">final</strong> byte[] tableName, <strong class="jxr_keyword">final</strong> byte[] row) <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="332" href="#332">332</a> <strong class="jxr_keyword">return</strong> execute(<strong class="jxr_keyword">new</strong> HConnectable<Boolean>(conf) {
-<a class="jxr_linenumber" name="333" href="#333">333</a> @Override
-<a class="jxr_linenumber" name="334" href="#334">334</a> <strong class="jxr_keyword">public</strong> Boolean connect(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) {
-<a class="jxr_linenumber" name="335" href="#335">335</a> <strong class="jxr_keyword">return</strong> ((HConnectionImplementation) connection).isRegionCached(tableName, row);
-<a class="jxr_linenumber" name="336" href="#336">336</a> }
-<a class="jxr_linenumber" name="337" href="#337">337</a> });
-<a class="jxr_linenumber" name="338" href="#338">338</a> }
-<a class="jxr_linenumber" name="339" href="#339">339</a>
-<a class="jxr_linenumber" name="340" href="#340">340</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="341" href="#341">341</a> <em class="jxr_javadoccomment"> * This class makes it convenient for one to execute a command in the context</em>
-<a class="jxr_linenumber" name="342" href="#342">342</a> <em class="jxr_javadoccomment"> * of a {@link HConnection} instance based on the given {@link Configuration}.</em>
-<a class="jxr_linenumber" name="343" href="#343">343</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="344" href="#344">344</a> <em class="jxr_javadoccomment"> * <p></em>
-<a class="jxr_linenumber" name="345" href="#345">345</a> <em class="jxr_javadoccomment"> * If you find yourself wanting to use a {@link HConnection} for a relatively</em>
-<a class="jxr_linenumber" name="346" href="#346">346</a> <em class="jxr_javadoccomment"> * short duration of time, and do not want to deal with the hassle of creating</em>
-<a class="jxr_linenumber" name="347" href="#347">347</a> <em class="jxr_javadoccomment"> * and cleaning up that resource, then you should consider using this</em>
-<a class="jxr_linenumber" name="348" href="#348">348</a> <em class="jxr_javadoccomment"> * convenience class.</em>
-<a class="jxr_linenumber" name="349" href="#349">349</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="350" href="#350">350</a> <em class="jxr_javadoccomment"> * @param <T></em>
-<a class="jxr_linenumber" name="351" href="#351">351</a> <em class="jxr_javadoccomment"> * the return type of the {@link HConnectable#connect(HConnection)}</em>
-<a class="jxr_linenumber" name="352" href="#352">352</a> <em class="jxr_javadoccomment"> * method.</em>
-<a class="jxr_linenumber" name="353" href="#353">353</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="354" href="#354">354</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">abstract</strong> <strong class="jxr_keyword">class</strong> HConnectable<T> {
-<a class="jxr_linenumber" name="355" href="#355">355</a> <strong class="jxr_keyword">public</strong> Configuration conf;
-<a class="jxr_linenumber" name="356" href="#356">356</a>
-<a class="jxr_linenumber" name="357" href="#357">357</a> <strong class="jxr_keyword">protected</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectable</a>(Configuration conf) {
-<a class="jxr_linenumber" name="358" href="#358">358</a> <strong class="jxr_keyword">this</strong>.conf = conf;
-<a class="jxr_linenumber" name="359" href="#359">359</a> }
-<a class="jxr_linenumber" name="360" href="#360">360</a>
-<a class="jxr_linenumber" name="361" href="#361">361</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">abstract</strong> T connect(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) <strong class="jxr_keyword">throws</strong> IOException;
-<a class="jxr_linenumber" name="362" href="#362">362</a> }
+<a class="jxr_linenumber" name="98" href="#98">98</a> <strong class="jxr_keyword">import</strong> com.google.common.annotations.VisibleForTesting;
+<a class="jxr_linenumber" name="99" href="#99">99</a> <strong class="jxr_keyword">import</strong> com.google.protobuf.ServiceException;
+<a class="jxr_linenumber" name="100" href="#100">100</a>
+<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * A non-instantiable class that manages {@link HConnection}s.</em>
+<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * This class has a static Map of {@link HConnection} instances keyed by</em>
+<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * {@link Configuration}; all invocations of {@link #getConnection(Configuration)}</em>
+<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * that pass the same {@link Configuration} instance will be returned the same</em>
+<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * {@link HConnection} instance (Adding properties to a Configuration</em>
+<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment"> * instance does not change its object identity). Sharing {@link HConnection}</em>
+<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * instances is usually what you want; all clients of the {@link HConnection}</em>
+<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * instances share the HConnections' cache of Region locations rather than each</em>
+<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * having to discover for itself the location of meta, etc. It makes</em>
+<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * sense for the likes of the pool of HTables class {@link HTablePool}, for</em>
+<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * instance (If concerned that a single {@link HConnection} is insufficient</em>
+<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * for sharing amongst clients in say an heavily-multithreaded environment,</em>
+<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * in practise its not proven to be an issue. Besides, {@link HConnection} is</em>
+<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> * implemented atop Hadoop RPC and as of this writing, Hadoop RPC does a</em>
+<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> * connection per cluster-member, exclusively).</em>
+<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment"> * <p>But sharing connections</em>
+<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment"> * makes clean up of {@link HConnection} instances a little awkward. Currently,</em>
+<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment"> * clients cleanup by calling</em>
+<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment"> * {@link #deleteConnection(Configuration)}. This will shutdown the</em>
+<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment"> * zookeeper connection the HConnection was using and clean up all</em>
+<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * HConnection resources as well as stopping proxies to servers out on the</em>
+<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment"> * cluster. Not running the cleanup will not end the world; it'll</em>
+<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment"> * just stall the closeup some and spew some zookeeper connection failed</em>
+<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment"> * messages into the log. Running the cleanup on a {@link HConnection} that is</em>
+<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * subsequently used by another will cause breakage so be careful running</em>
+<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * cleanup.</em>
+<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment"> * <p>To create a {@link HConnection} that is not shared by others, you can</em>
+<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment"> * create a new {@link Configuration} instance, pass this new instance to</em>
+<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment"> * {@link #getConnection(Configuration)}, and then when done, close it up by</em>
+<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment"> * doing something like the following:</em>
+<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment"> * <pre></em>
+<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment"> * {@code</em>
+<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment"> * Configuration newConfig = new Configuration(originalConf);</em>
+<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment"> * HConnection connection = HConnectionManager.getConnection(newConfig);</em>
+<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment"> * // Use the connection to your hearts' delight and then when done...</em>
+<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment"> * HConnectionManager.deleteConnection(newConfig, true);</em>
+<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment"> * }</em>
+<a class="jxr_linenumber" name="140" href="#140">140</a> <em class="jxr_javadoccomment"> * </pre></em>
+<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment"> * <p>Cleanup used to be done inside in a shutdown hook. On startup we'd</em>
+<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment"> * register a shutdown hook that called {@link #deleteAllConnections()}</em>
+<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment"> * on its way out but the order in which shutdown hooks run is not defined so</em>
+<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment"> * were problematic for clients of HConnection that wanted to register their</em>
+<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment"> * own shutdown hooks so we removed ours though this shifts the onus for</em>
+<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment"> * cleanup to the client.</em>
+<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="148" href="#148">148</a> @SuppressWarnings(<span class="jxr_string">"serial"</span>)
+<a class="jxr_linenumber" name="149" href="#149">149</a> @InterfaceAudience.Public
+<a class="jxr_linenumber" name="150" href="#150">150</a> @InterfaceStability.Evolving
+<a class="jxr_linenumber" name="151" href="#151">151</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionManager</a> {
+<a class="jxr_linenumber" name="152" href="#152">152</a> <em class="jxr_comment">// An LRU Map of HConnectionKey -> HConnection (TableServer). All</em>
+<a class="jxr_linenumber" name="153" href="#153">153</a> <em class="jxr_comment">// access must be synchronized. This map is not private because tests</em>
+<a class="jxr_linenumber" name="154" href="#154">154</a> <em class="jxr_comment">// need to be able to tinker with it.</em>
+<a class="jxr_linenumber" name="155" href="#155">155</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Map<HConnectionKey, HConnectionImplementation> HBASE_INSTANCES;
+<a class="jxr_linenumber" name="156" href="#156">156</a>
+<a class="jxr_linenumber" name="157" href="#157">157</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MAX_CACHED_HBASE_INSTANCES;
+<a class="jxr_linenumber" name="158" href="#158">158</a>
+<a class="jxr_linenumber" name="159" href="#159">159</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Parameter name for what client protocol to use. */</em>
+<a class="jxr_linenumber" name="160" href="#160">160</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String CLIENT_PROTOCOL_CLASS = <span class="jxr_string">"hbase.clientprotocol.class"</span>;
+<a class="jxr_linenumber" name="161" href="#161">161</a>
+<a class="jxr_linenumber" name="162" href="#162">162</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Default client protocol class name. */</em>
+<a class="jxr_linenumber" name="163" href="#163">163</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_CLIENT_PROTOCOL_CLASS = ClientProtocol.<strong class="jxr_keyword">class</strong>.getName();
+<a class="jxr_linenumber" name="164" href="#164">164</a>
+<a class="jxr_linenumber" name="165" href="#165">165</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Parameter name for what admin protocol to use. */</em>
+<a class="jxr_linenumber" name="166" href="#166">166</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String REGION_PROTOCOL_CLASS = <span class="jxr_string">"hbase.adminprotocol.class"</span>;
+<a class="jxr_linenumber" name="167" href="#167">167</a>
+<a class="jxr_linenumber" name="168" href="#168">168</a> <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Default admin protocol class name. */</em>
+<a class="jxr_linenumber" name="169" href="#169">169</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_ADMIN_PROTOCOL_CLASS = AdminProtocol.<strong class="jxr_keyword">class</strong>.getName();
+<a class="jxr_linenumber" name="170" href="#170">170</a>
+<a class="jxr_linenumber" name="171" href="#171">171</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String RETRIES_BY_SERVER = <span class="jxr_string">"hbase.client.retries.by.server"</span>;
+<a class="jxr_linenumber" name="172" href="#172">172</a>
+<a class="jxr_linenumber" name="173" href="#173">173</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Log LOG = LogFactory.getLog(HConnectionManager.<strong class="jxr_keyword">class</strong>);
+<a class="jxr_linenumber" name="174" href="#174">174</a>
+<a class="jxr_linenumber" name="175" href="#175">175</a> <strong class="jxr_keyword">static</strong> {
+<a class="jxr_linenumber" name="176" href="#176">176</a> <em class="jxr_comment">// We set instances to one more than the value specified for {@link</em>
+<a class="jxr_linenumber" name="177" href="#177">177</a> <em class="jxr_comment">// HConstants#ZOOKEEPER_MAX_CLIENT_CNXNS}. By default, the zk default max</em>
+<a class="jxr_linenumber" name="178" href="#178">178</a> <em class="jxr_comment">// connections to the ensemble from the one client is 30, so in that case we</em>
+<a class="jxr_linenumber" name="179" href="#179">179</a> <em class="jxr_comment">// should run into zk issues before the LRU hit this value of 31.</em>
+<a class="jxr_linenumber" name="180" href="#180">180</a> MAX_CACHED_HBASE_INSTANCES = HBaseConfiguration.create().getInt(
+<a class="jxr_linenumber" name="181" href="#181">181</a> HConstants.ZOOKEEPER_MAX_CLIENT_CNXNS,
+<a class="jxr_linenumber" name="182" href="#182">182</a> HConstants.DEFAULT_ZOOKEPER_MAX_CLIENT_CNXNS) + 1;
+<a class="jxr_linenumber" name="183" href="#183">183</a> HBASE_INSTANCES = <strong class="jxr_keyword">new</strong> LinkedHashMap<HConnectionKey, HConnectionImplementation>(
+<a class="jxr_linenumber" name="184" href="#184">184</a> (<strong class="jxr_keyword">int</strong>) (MAX_CACHED_HBASE_INSTANCES / 0.75F) + 1, 0.75F, <strong class="jxr_keyword">true</strong>) {
+<a class="jxr_linenumber" name="185" href="#185">185</a> @Override
+<a class="jxr_linenumber" name="186" href="#186">186</a> <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> removeEldestEntry(
+<a class="jxr_linenumber" name="187" href="#187">187</a> Map.Entry<HConnectionKey, HConnectionImplementation> eldest) {
+<a class="jxr_linenumber" name="188" href="#188">188</a> <strong class="jxr_keyword">return</strong> size() > MAX_CACHED_HBASE_INSTANCES;
+<a class="jxr_linenumber" name="189" href="#189">189</a> }
+<a class="jxr_linenumber" name="190" href="#190">190</a> };
+<a class="jxr_linenumber" name="191" href="#191">191</a> }
+<a class="jxr_linenumber" name="192" href="#192">192</a>
+<a class="jxr_linenumber" name="193" href="#193">193</a> <em class="jxr_comment">/*</em>
+<a class="jxr_linenumber" name="194" href="#194">194</a> <em class="jxr_comment"> * Non-instantiable.</em>
+<a class="jxr_linenumber" name="195" href="#195">195</a> <em class="jxr_comment"> */</em>
+<a class="jxr_linenumber" name="196" href="#196">196</a> <strong class="jxr_keyword">protected</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionManager</a>() {
+<a class="jxr_linenumber" name="197" href="#197">197</a> <strong class="jxr_keyword">super</strong>();
+<a class="jxr_linenumber" name="198" href="#198">198</a> }
+<a class="jxr_linenumber" name="199" href="#199">199</a>
+<a class="jxr_linenumber" name="200" href="#200">200</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="201" href="#201">201</a> <em class="jxr_javadoccomment"> * Get the connection that goes with the passed <code>conf</code></em>
+<a class="jxr_linenumber" name="202" href="#202">202</a> <em class="jxr_javadoccomment"> * configuration instance.</em>
+<a class="jxr_linenumber" name="203" href="#203">203</a> <em class="jxr_javadoccomment"> * If no current connection exists, method creates a new connection for the</em>
+<a class="jxr_linenumber" name="204" href="#204">204</a> <em class="jxr_javadoccomment"> * passed <code>conf</code> instance.</em>
+<a class="jxr_linenumber" name="205" href="#205">205</a> <em class="jxr_javadoccomment"> * @param conf configuration</em>
+<a class="jxr_linenumber" name="206" href="#206">206</a> <em class="jxr_javadoccomment"> * @return HConnection object for <code>conf</code></em>
+<a class="jxr_linenumber" name="207" href="#207">207</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
+<a class="jxr_linenumber" name="208" href="#208">208</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="209" href="#209">209</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> getConnection(Configuration conf)
+<a class="jxr_linenumber" name="210" href="#210">210</a> <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="211" href="#211">211</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a> connectionKey = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a>(conf);
+<a class="jxr_linenumber" name="212" href="#212">212</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
+<a class="jxr_linenumber" name="213" href="#213">213</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a> connection = HBASE_INSTANCES.get(connectionKey);
+<a class="jxr_linenumber" name="214" href="#214">214</a> <strong class="jxr_keyword">if</strong> (connection == <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="215" href="#215">215</a> connection = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a>(conf, <strong class="jxr_keyword">true</strong>);
+<a class="jxr_linenumber" name="216" href="#216">216</a> HBASE_INSTANCES.put(connectionKey, connection);
+<a class="jxr_linenumber" name="217" href="#217">217</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (connection.isClosed()) {
+<a class="jxr_linenumber" name="218" href="#218">218</a> HConnectionManager.deleteConnection(connectionKey, <strong class="jxr_keyword">true</strong>);
+<a class="jxr_linenumber" name="219" href="#219">219</a> connection = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a>(conf, <strong class="jxr_keyword">true</strong>);
+<a class="jxr_linenumber" name="220" href="#220">220</a> HBASE_INSTANCES.put(connectionKey, connection);
+<a class="jxr_linenumber" name="221" href="#221">221</a> }
+<a class="jxr_linenumber" name="222" href="#222">222</a> connection.incCount();
+<a class="jxr_linenumber" name="223" href="#223">223</a> <strong class="jxr_keyword">return</strong> connection;
+<a class="jxr_linenumber" name="224" href="#224">224</a> }
+<a class="jxr_linenumber" name="225" href="#225">225</a> }
+<a class="jxr_linenumber" name="226" href="#226">226</a>
+<a class="jxr_linenumber" name="227" href="#227">227</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="228" href="#228">228</a> <em class="jxr_javadoccomment"> * Create a new HConnection instance using the passed <code>conf</code></em>
+<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_javadoccomment"> * instance.</em>
+<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_javadoccomment"> * Note: This bypasses the usual HConnection life cycle management!</em>
+<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment"> * Use this with caution, the caller is responsible for closing the</em>
+<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment"> * created connection.</em>
+<a class="jxr_linenumber" name="233" href="#233">233</a> <em class="jxr_javadoccomment"> * @param conf configuration</em>
+<a class="jxr_linenumber" name="234" href="#234">234</a> <em class="jxr_javadoccomment"> * @return HConnection object for <code>conf</code></em>
+<a class="jxr_linenumber" name="235" href="#235">235</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
+<a class="jxr_linenumber" name="236" href="#236">236</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="237" href="#237">237</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> createConnection(Configuration conf)
+<a class="jxr_linenumber" name="238" href="#238">238</a> <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="239" href="#239">239</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a>(conf, false);
+<a class="jxr_linenumber" name="240" href="#240">240</a> }
+<a class="jxr_linenumber" name="241" href="#241">241</a>
+<a class="jxr_linenumber" name="242" href="#242">242</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="243" href="#243">243</a> <em class="jxr_javadoccomment"> * Delete connection information for the instance specified by configuration.</em>
+<a class="jxr_linenumber" name="244" href="#244">244</a> <em class="jxr_javadoccomment"> * If there are no more references to it, this will then close connection to</em>
+<a class="jxr_linenumber" name="245" href="#245">245</a> <em class="jxr_javadoccomment"> * the zookeeper ensemble and let go of all resources.</em>
+<a class="jxr_linenumber" name="246" href="#246">246</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="247" href="#247">247</a> <em class="jxr_javadoccomment"> * @param conf</em>
+<a class="jxr_linenumber" name="248" href="#248">248</a> <em class="jxr_javadoccomment"> * configuration whose identity is used to find {@link HConnection}</em>
+<a class="jxr_linenumber" name="249" href="#249">249</a> <em class="jxr_javadoccomment"> * instance.</em>
+<a class="jxr_linenumber" name="250" href="#250">250</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="251" href="#251">251</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteConnection(Configuration conf) {
+<a class="jxr_linenumber" name="252" href="#252">252</a> deleteConnection(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a>(conf), false);
+<a class="jxr_linenumber" name="253" href="#253">253</a> }
+<a class="jxr_linenumber" name="254" href="#254">254</a>
+<a class="jxr_linenumber" name="255" href="#255">255</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="256" href="#256">256</a> <em class="jxr_javadoccomment"> * Delete stale connection information for the instance specified by configuration.</em>
+<a class="jxr_linenumber" name="257" href="#257">257</a> <em class="jxr_javadoccomment"> * This will then close connection to</em>
+<a class="jxr_linenumber" name="258" href="#258">258</a> <em class="jxr_javadoccomment"> * the zookeeper ensemble and let go of all resources.</em>
+<a class="jxr_linenumber" name="259" href="#259">259</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="260" href="#260">260</a> <em class="jxr_javadoccomment"> * @param connection</em>
+<a class="jxr_linenumber" name="261" href="#261">261</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="262" href="#262">262</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteStaleConnection(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) {
+<a class="jxr_linenumber" name="263" href="#263">263</a> deleteConnection(connection, <strong class="jxr_keyword">true</strong>);
+<a class="jxr_linenumber" name="264" href="#264">264</a> }
+<a class="jxr_linenumber" name="265" href="#265">265</a>
+<a class="jxr_linenumber" name="266" href="#266">266</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="267" href="#267">267</a> <em class="jxr_javadoccomment"> * Delete information for all connections.</em>
+<a class="jxr_linenumber" name="268" href="#268">268</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="269" href="#269">269</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteAllConnections() {
+<a class="jxr_linenumber" name="270" href="#270">270</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
+<a class="jxr_linenumber" name="271" href="#271">271</a> Set<HConnectionKey> connectionKeys = <strong class="jxr_keyword">new</strong> HashSet<HConnectionKey>();
+<a class="jxr_linenumber" name="272" href="#272">272</a> connectionKeys.addAll(HBASE_INSTANCES.keySet());
+<a class="jxr_linenumber" name="273" href="#273">273</a> <strong class="jxr_keyword">for</strong> (HConnectionKey connectionKey : connectionKeys) {
+<a class="jxr_linenumber" name="274" href="#274">274</a> deleteConnection(connectionKey, false);
+<a class="jxr_linenumber" name="275" href="#275">275</a> }
+<a class="jxr_linenumber" name="276" href="#276">276</a> HBASE_INSTANCES.clear();
+<a class="jxr_linenumber" name="277" href="#277">277</a> }
+<a class="jxr_linenumber" name="278" href="#278">278</a> }
+<a class="jxr_linenumber" name="279" href="#279">279</a>
+<a class="jxr_linenumber" name="280" href="#280">280</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteConnection(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection, <strong class="jxr_keyword">boolean</strong> staleConnection) {
+<a class="jxr_linenumber" name="281" href="#281">281</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
+<a class="jxr_linenumber" name="282" href="#282">282</a> <strong class="jxr_keyword">for</strong> (Entry<HConnectionKey, HConnectionImplementation> connectionEntry : HBASE_INSTANCES
+<a class="jxr_linenumber" name="283" href="#283">283</a> .entrySet()) {
+<a class="jxr_linenumber" name="284" href="#284">284</a> <strong class="jxr_keyword">if</strong> (connectionEntry.getValue() == connection) {
+<a class="jxr_linenumber" name="285" href="#285">285</a> deleteConnection(connectionEntry.getKey(), staleConnection);
+<a class="jxr_linenumber" name="286" href="#286">286</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="287" href="#287">287</a> }
+<a class="jxr_linenumber" name="288" href="#288">288</a> }
+<a class="jxr_linenumber" name="289" href="#289">289</a> }
+<a class="jxr_linenumber" name="290" href="#290">290</a> }
+<a class="jxr_linenumber" name="291" href="#291">291</a>
+<a class="jxr_linenumber" name="292" href="#292">292</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> deleteConnection(<a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a> connectionKey, <strong class="jxr_keyword">boolean</strong> staleConnection) {
+<a class="jxr_linenumber" name="293" href="#293">293</a> <strong class="jxr_keyword">synchronized</strong> (HBASE_INSTANCES) {
+<a class="jxr_linenumber" name="294" href="#294">294</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionImplementation</a> connection = HBASE_INSTANCES
+<a class="jxr_linenumber" name="295" href="#295">295</a> .get(connectionKey);
+<a class="jxr_linenumber" name="296" href="#296">296</a> <strong class="jxr_keyword">if</strong> (connection != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="297" href="#297">297</a> connection.decCount();
+<a class="jxr_linenumber" name="298" href="#298">298</a> <strong class="jxr_keyword">if</strong> (connection.isZeroReference() || staleConnection) {
+<a class="jxr_linenumber" name="299" href="#299">299</a> HBASE_INSTANCES.remove(connectionKey);
+<a class="jxr_linenumber" name="300" href="#300">300</a> connection.internalClose();
+<a class="jxr_linenumber" name="301" href="#301">301</a> }
+<a class="jxr_linenumber" name="302" href="#302">302</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="303" href="#303">303</a> LOG.error(<span class="jxr_string">"Connection not found in the list, can't delete it "</span>+
+<a class="jxr_linenumber" name="304" href="#304">304</a> <span class="jxr_string">"(connection key="</span>+connectionKey+<span class="jxr_string">"). May be the key was modified?"</span>);
+<a class="jxr_linenumber" name="305" href="#305">305</a> }
+<a class="jxr_linenumber" name="306" href="#306">306</a> }
+<a class="jxr_linenumber" name="307" href="#307">307</a> }
+<a class="jxr_linenumber" name="308" href="#308">308</a>
+<a class="jxr_linenumber" name="309" href="#309">309</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="310" href="#310">310</a> <em class="jxr_javadoccomment"> * It is provided for unit test cases which verify the behavior of region</em>
+<a class="jxr_linenumber" name="311" href="#311">311</a> <em class="jxr_javadoccomment"> * location cache prefetch.</em>
+<a class="jxr_linenumber" name="312" href="#312">312</a> <em class="jxr_javadoccomment"> * @return Number of cached regions for the table.</em>
+<a class="jxr_linenumber" name="313" href="#313">313</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
+<a class="jxr_linenumber" name="314" href="#314">314</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="315" href="#315">315</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> getCachedRegionCount(Configuration conf,
+<a class="jxr_linenumber" name="316" href="#316">316</a> <strong class="jxr_keyword">final</strong> byte[] tableName)
+<a class="jxr_linenumber" name="317" href="#317">317</a> <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="318" href="#318">318</a> <strong class="jxr_keyword">return</strong> execute(<strong class="jxr_keyword">new</strong> HConnectable<Integer>(conf) {
+<a class="jxr_linenumber" name="319" href="#319">319</a> @Override
+<a class="jxr_linenumber" name="320" href="#320">320</a> <strong class="jxr_keyword">public</strong> Integer connect(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) {
+<a class="jxr_linenumber" name="321" href="#321">321</a> <strong class="jxr_keyword">return</strong> ((HConnectionImplementation) connection)
+<a class="jxr_linenumber" name="322" href="#322">322</a> .getNumberOfCachedRegionLocations(tableName);
+<a class="jxr_linenumber" name="323" href="#323">323</a> }
+<a class="jxr_linenumber" name="324" href="#324">324</a> });
+<a class="jxr_linenumber" name="325" href="#325">325</a> }
+<a class="jxr_linenumber" name="326" href="#326">326</a>
+<a class="jxr_linenumber" name="327" href="#327">327</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="328" href="#328">328</a> <em class="jxr_javadoccomment"> * It's provided for unit test cases which verify the behavior of region</em>
+<a class="jxr_linenumber" name="329" href="#329">329</a> <em class="jxr_javadoccomment"> * location cache prefetch.</em>
+<a class="jxr_linenumber" name="330" href="#330">330</a> <em class="jxr_javadoccomment"> * @return true if the region where the table and row reside is cached.</em>
+<a class="jxr_linenumber" name="331" href="#331">331</a> <em class="jxr_javadoccomment"> * @throws ZooKeeperConnectionException</em>
+<a class="jxr_linenumber" name="332" href="#332">332</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="333" href="#333">333</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isRegionCached(Configuration conf,
+<a class="jxr_linenumber" name="334" href="#334">334</a> <strong class="jxr_keyword">final</strong> byte[] tableName, <strong class="jxr_keyword">final</strong> byte[] row) <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="335" href="#335">335</a> <strong class="jxr_keyword">return</strong> execute(<strong class="jxr_keyword">new</strong> HConnectable<Boolean>(conf) {
+<a class="jxr_linenumber" name="336" href="#336">336</a> @Override
+<a class="jxr_linenumber" name="337" href="#337">337</a> <strong class="jxr_keyword">public</strong> Boolean connect(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) {
+<a class="jxr_linenumber" name="338" href="#338">338</a> <strong class="jxr_keyword">return</strong> ((HConnectionImplementation) connection).isRegionCached(tableName, row);
+<a class="jxr_linenumber" name="339" href="#339">339</a> }
+<a class="jxr_linenumber" name="340" href="#340">340</a> });
+<a class="jxr_linenumber" name="341" href="#341">341</a> }
+<a class="jxr_linenumber" name="342" href="#342">342</a>
+<a class="jxr_linenumber" name="343" href="#343">343</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="344" href="#344">344</a> <em class="jxr_javadoccomment"> * This class makes it convenient for one to execute a command in the context</em>
+<a class="jxr_linenumber" name="345" href="#345">345</a> <em class="jxr_javadoccomment"> * of a {@link HConnection} instance based on the given {@link Configuration}.</em>
+<a class="jxr_linenumber" name="346" href="#346">346</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="347" href="#347">347</a> <em class="jxr_javadoccomment"> * <p></em>
+<a class="jxr_linenumber" name="348" href="#348">348</a> <em class="jxr_javadoccomment"> * If you find yourself wanting to use a {@link HConnection} for a relatively</em>
+<a class="jxr_linenumber" name="349" href="#349">349</a> <em class="jxr_javadoccomment"> * short duration of time, and do not want to deal with the hassle of creating</em>
+<a class="jxr_linenumber" name="350" href="#350">350</a> <em class="jxr_javadoccomment"> * and cleaning up that resource, then you should consider using this</em>
+<a class="jxr_linenumber" name="351" href="#351">351</a> <em class="jxr_javadoccomment"> * convenience class.</em>
+<a class="jxr_linenumber" name="352" href="#352">352</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="353" href="#353">353</a> <em class="jxr_javadoccomment"> * @param <T></em>
+<a class="jxr_linenumber" name="354" href="#354">354</a> <em class="jxr_javadoccomment"> * the return type of the {@link HConnectable#connect(HConnection)}</em>
+<a class="jxr_linenumber" name="355" href="#355">355</a> <em class="jxr_javadoccomment"> * method.</em>
+<a class="jxr_linenumber" name="356" href="#356">356</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="357" href="#357">357</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">abstract</strong> <strong class="jxr_keyword">class</strong> HConnectable<T> {
+<a class="jxr_linenumber" name="358" href="#358">358</a> <strong class="jxr_keyword">public</strong> Configuration conf;
+<a class="jxr_linenumber" name="359" href="#359">359</a>
+<a class="jxr_linenumber" name="360" href="#360">360</a> <strong class="jxr_keyword">protected</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectable</a>(Configuration conf) {
+<a class="jxr_linenumber" name="361" href="#361">361</a> <strong class="jxr_keyword">this</strong>.conf = conf;
+<a class="jxr_linenumber" name="362" href="#362">362</a> }
<a class="jxr_linenumber" name="363" href="#363">363</a>
-<a class="jxr_linenumber" name="364" href="#364">364</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="365" href="#365">365</a> <em class="jxr_javadoccomment"> * This convenience method invokes the given {@link HConnectable#connect}</em>
-<a class="jxr_linenumber" name="366" href="#366">366</a> <em class="jxr_javadoccomment"> * implementation using a {@link HConnection} instance that lasts just for the</em>
-<a class="jxr_linenumber" name="367" href="#367">367</a> <em class="jxr_javadoccomment"> * duration of that invocation.</em>
-<a class="jxr_linenumber" name="368" href="#368">368</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="369" href="#369">369</a> <em class="jxr_javadoccomment"> * @param <T> the return type of the connect method</em>
-<a class="jxr_linenumber" name="370" href="#370">370</a> <em class="jxr_javadoccomment"> * @param connectable the {@link HConnectable} instance</em>
-<a class="jxr_linenumber" name="371" href="#371">371</a> <em class="jxr_javadoccomment"> * @return the value returned by the connect method</em>
-<a class="jxr_linenumber" name="372" href="#372">372</a> <em class="jxr_javadoccomment"> * @throws IOException</em>
-<a class="jxr_linenumber" name="373" href="#373">373</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="374" href="#374">374</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <T> T execute(HConnectable<T> connectable) <strong class="jxr_keyword">throws</strong> IOException {
-<a class="jxr_linenumber" name="375" href="#375">375</a> <strong class="jxr_keyword">if</strong> (connectable == <strong class="jxr_keyword">null</strong> || connectable.conf == <strong class="jxr_keyword">null</strong>) {
-<a class="jxr_linenumber" name="376" href="#376">376</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
-<a class="jxr_linenumber" name="377" href="#377">377</a> }
-<a class="jxr_linenumber" name="378" href="#378">378</a> Configuration conf = connectable.conf;
-<a class="jxr_linenumber" name="379" href="#379">379</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection = HConnectionManager.getConnection(conf);
-<a class="jxr_linenumber" name="380" href="#380">380</a> <strong class="jxr_keyword">boolean</strong> connectSucceeded = false;
-<a class="jxr_linenumber" name="381" href="#381">381</a> <strong class="jxr_keyword">try</strong> {
-<a class="jxr_linenumber" name="382" href="#382">382</a> T returnValue = connectable.connect(connection);
-<a class="jxr_linenumber" name="383" href="#383">383</a> connectSucceeded = <strong class="jxr_keyword">true</strong>;
-<a class="jxr_linenumber" name="384" href="#384">384</a> <strong class="jxr_keyword">return</strong> returnValue;
-<a class="jxr_linenumber" name="385" href="#385">385</a> } <strong class="jxr_keyword">finally</strong> {
-<a class="jxr_linenumber" name="386" href="#386">386</a> <strong class="jxr_keyword">try</strong> {
-<a class="jxr_linenumber" name="387" href="#387">387</a> connection.close();
-<a class="jxr_linenumber" name="388" href="#388">388</a> } <strong class="jxr_keyword">catch</strong> (Exception e) {
-<a class="jxr_linenumber" name="389" href="#389">389</a> <strong class="jxr_keyword">if</strong> (connectSucceeded) {
-<a class="jxr_linenumber" name="390" href="#390">390</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IOException(<span class="jxr_string">"The connection to "</span> + connection
-<a class="jxr_linenumber" name="391" href="#391">391</a> + <span class="jxr_string">" could not be deleted."</span>, e);
-<a class="jxr_linenumber" name="392" href="#392">392</a> }
-<a class="jxr_linenumber" name="393" href="#393">393</a> }
-<a class="jxr_linenumber" name="394" href="#394">394</a> }
-<a class="jxr_linenumber" name="395" href="#395">395</a> }
-<a class="jxr_linenumber" name="396" href="#396">396</a>
-<a class="jxr_linenumber" name="397" href="#397">397</a> <em class="jxr_javadoccomment">/**</em>
-<a class="jxr_linenumber" name="398" href="#398">398</a> <em class="jxr_javadoccomment"> * Denotes a unique key to a {@link HConnection} instance.</em>
-<a class="jxr_linenumber" name="399" href="#399">399</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="400" href="#400">400</a> <em class="jxr_javadoccomment"> * In essence, this class captures the properties in {@link Configuration}</em>
-<a class="jxr_linenumber" name="401" href="#401">401</a> <em class="jxr_javadoccomment"> * that may be used in the process of establishing a connection. In light of</em>
-<a class="jxr_linenumber" name="402" href="#402">402</a> <em class="jxr_javadoccomment"> * that, if any new such properties are introduced into the mix, they must be</em>
-<a class="jxr_linenumber" name="403" href="#403">403</a> <em class="jxr_javadoccomment"> * added to the {@link HConnectionKey#properties} list.</em>
-<a class="jxr_linenumber" name="404" href="#404">404</a> <em class="jxr_javadoccomment"> *</em>
-<a class="jxr_linenumber" name="405" href="#405">405</a> <em class="jxr_javadoccomment"> */</em>
-<a class="jxr_linenumber" name="406" href="#406">406</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a> {
-<a class="jxr_linenumber" name="407" href="#407">407</a> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">static</strong> String[] CONNECTION_PROPERTIES = <strong class="jxr_keyword">new</strong> String[] {
-<a class="jxr_linenumber" name="408" href="#408">408</a> HConstants.ZOOKEEPER_QUORUM, HConstants.ZOOKEEPER_ZNODE_PARENT,
-<a class="jxr_linenumber" name="409" href="#409">409</a> HConstants.ZOOKEEPER_CLIENT_PORT,
-<a class="jxr_linenumber" name="410" href="#410">410</a> HConstants.ZOOKEEPER_RECOVERABLE_WAITTIME,
-<a class="jxr_linenumber" name="411" href="#411">411</a> HConstants.HBASE_CLIENT_PAUSE, HConstants.HBASE_CLIENT_RETRIES_NUMBER,
-<a class="jxr_linenumber" name="412" href="#412">412</a> HConstants.HBASE_CLIENT_RPC_MAXATTEMPTS,
-<a class="jxr_linenumber" name="413" href="#413">413</a> HConstants.HBASE_RPC_TIMEOUT_KEY,
-<a class="jxr_linenumber" name="414" href="#414">414</a> HConstants.HBASE_CLIENT_PREFETCH_LIMIT,
-<a class="jxr_linenumber" name="415" href="#415">415</a> HConstants.HBASE_META_SCANNER_CACHING,
-<a class="jxr_linenumber" name="416" href="#416">416</a> HConstants.HBASE_CLIENT_INSTANCE_ID };
-<a class="jxr_linenumber" name="417" href="#417">417</a>
-<a class="jxr_linenumber" name="418" href="#418">418</a> <strong class="jxr_keyword">private</strong> Map<String, String> properties;
-<a class="jxr_linenumber" name="419" href="#419">419</a> <strong class="jxr_keyword">private</strong> String username;
+<a class="jxr_linenumber" name="364" href="#364">364</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">abstract</strong> T connect(<a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection) <strong class="jxr_keyword">throws</strong> IOException;
+<a class="jxr_linenumber" name="365" href="#365">365</a> }
+<a class="jxr_linenumber" name="366" href="#366">366</a>
+<a class="jxr_linenumber" name="367" href="#367">367</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="368" href="#368">368</a> <em class="jxr_javadoccomment"> * This convenience method invokes the given {@link HConnectable#connect}</em>
+<a class="jxr_linenumber" name="369" href="#369">369</a> <em class="jxr_javadoccomment"> * implementation using a {@link HConnection} instance that lasts just for the</em>
+<a class="jxr_linenumber" name="370" href="#370">370</a> <em class="jxr_javadoccomment"> * duration of that invocation.</em>
+<a class="jxr_linenumber" name="371" href="#371">371</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="372" href="#372">372</a> <em class="jxr_javadoccomment"> * @param <T> the return type of the connect method</em>
+<a class="jxr_linenumber" name="373" href="#373">373</a> <em class="jxr_javadoccomment"> * @param connectable the {@link HConnectable} instance</em>
+<a class="jxr_linenumber" name="374" href="#374">374</a> <em class="jxr_javadoccomment"> * @return the value returned by the connect method</em>
+<a class="jxr_linenumber" name="375" href="#375">375</a> <em class="jxr_javadoccomment"> * @throws IOException</em>
+<a class="jxr_linenumber" name="376" href="#376">376</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="377" href="#377">377</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <T> T execute(HConnectable<T> connectable) <strong class="jxr_keyword">throws</strong> IOException {
+<a class="jxr_linenumber" name="378" href="#378">378</a> <strong class="jxr_keyword">if</strong> (connectable == <strong class="jxr_keyword">null</strong> || connectable.conf == <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="379" href="#379">379</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="380" href="#380">380</a> }
+<a class="jxr_linenumber" name="381" href="#381">381</a> Configuration conf = connectable.conf;
+<a class="jxr_linenumber" name="382" href="#382">382</a> <a href="../../../../../org/apache/hadoop/hbase/client/HConnection.html">HConnection</a> connection = HConnectionManager.getConnection(conf);
+<a class="jxr_linenumber" name="383" href="#383">383</a> <strong class="jxr_keyword">boolean</strong> connectSucceeded = false;
+<a class="jxr_linenumber" name="384" href="#384">384</a> <strong class="jxr_keyword">try</strong> {
+<a class="jxr_linenumber" name="385" href="#385">385</a> T returnValue = connectable.connect(connection);
+<a class="jxr_linenumber" name="386" href="#386">386</a> connectSucceeded = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="387" href="#387">387</a> <strong class="jxr_keyword">return</strong> returnValue;
+<a class="jxr_linenumber" name="388" href="#388">388</a> } <strong class="jxr_keyword">finally</strong> {
+<a class="jxr_linenumber" name="389" href="#389">389</a> <strong class="jxr_keyword">try</strong> {
+<a class="jxr_linenumber" name="390" href="#390">390</a> connection.close();
+<a class="jxr_linenumber" name="391" href="#391">391</a> } <strong class="jxr_keyword">catch</strong> (Exception e) {
+<a class="jxr_linenumber" name="392" href="#392">392</a> <strong class="jxr_keyword">if</strong> (connectSucceeded) {
+<a class="jxr_linenumber" name="393" href="#393">393</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IOException(<span class="jxr_string">"The connection to "</span> + connection
+<a class="jxr_linenumber" name="394" href="#394">394</a> + <span class="jxr_string">" could not be deleted."</span>, e);
+<a class="jxr_linenumber" name="395" href="#395">395</a> }
+<a class="jxr_linenumber" name="396" href="#396">396</a> }
+<a class="jxr_linenumber" name="397" href="#397">397</a> }
+<a class="jxr_linenumber" name="398" href="#398">398</a> }
+<a class="jxr_linenumber" name="399" href="#399">399</a>
+<a class="jxr_linenumber" name="400" href="#400">400</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="401" href="#401">401</a> <em class="jxr_javadoccomment"> * Denotes a unique key to a {@link HConnection} instance.</em>
+<a class="jxr_linenumber" name="402" href="#402">402</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="403" href="#403">403</a> <em class="jxr_javadoccomment"> * In essence, this class captures the properties in {@link Configuration}</em>
+<a class="jxr_linenumber" name="404" href="#404">404</a> <em class="jxr_javadoccomment"> * that may be used in the process of establishing a connection. In light of</em>
+<a class="jxr_linenumber" name="405" href="#405">405</a> <em class="jxr_javadoccomment"> * that, if any new such properties are introduced into the mix, they must be</em>
+<a class="jxr_linenumber" name="406" href="#406">406</a> <em class="jxr_javadoccomment"> * added to the {@link HConnectionKey#properties} list.</em>
+<a class="jxr_linenumber" name="407" href="#407">407</a> <em class="jxr_javadoccomment"> *</em>
+<a class="jxr_linenumber" name="408" href="#408">408</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="409" href="#409">409</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a> {
+<a class="jxr_linenumber" name="410" href="#410">410</a> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">static</strong> String[] CONNECTION_PROPERTIES = <strong class="jxr_keyword">new</strong> String[] {
+<a class="jxr_linenumber" name="411" href="#411">411</a> HConstants.ZOOKEEPER_QUORUM, HConstants.ZOOKEEPER_ZNODE_PARENT,
+<a class="jxr_linenumber" name="412" href="#412">412</a> HConstants.ZOOKEEPER_CLIENT_PORT,
+<a class="jxr_linenumber" name="413" href="#413">413</a> HConstants.ZOOKEEPER_RECOVERABLE_WAITTIME,
+<a class="jxr_linenumber" name="414" href="#414">414</a> HConstants.HBASE_CLIENT_PAUSE, HConstants.HBASE_CLIENT_RETRIES_NUMBER,
+<a class="jxr_linenumber" name="415" href="#415">415</a> HConstants.HBASE_CLIENT_RPC_MAXATTEMPTS,
+<a class="jxr_linenumber" name="416" href="#416">416</a> HConstants.HBASE_RPC_TIMEOUT_KEY,
+<a class="jxr_linenumber" name="417" href="#417">417</a> HConstants.HBASE_CLIENT_PREFETCH_LIMIT,
+<a class="jxr_linenumber" name="418" href="#418">418</a> HConstants.HBASE_META_SCANNER_CACHING,
+<a class="jxr_linenumber" name="419" href="#419">419</a> HConstants.HBASE_CLIENT_INSTANCE_ID };
<a class="jxr_linenumber" name="420" href="#420">420</a>
-<a class="jxr_linenumber" name="421" href="#421">421</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/hadoop/hbase/client/HConnectionManager.html">HConnectionKey</a>(Configuration conf) {
-<a class="jxr_linenumber" name="422" href="#422">422</a> Map<String, String> m = <strong class="jxr_keyword">new</strong> HashMap<String, String>();
-<a class="jxr_linenumber" name="423" href="#423">423</a> <strong class="jxr_keyword">if</strong> (conf != <strong class="jxr_keyword">null</strong>) {
-<a class="jxr_linenumber" name="424" href="#424">424</a> <strong class="jxr_keyword">for</strong> (String property : CONNECTION_PROPERTIES) {
-<a class="jxr_linenumber" name="425" href="#425">425</a> String value = conf.get(property);
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