You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hbase.apache.org by mi...@apache.org on 2016/02/05 05:32:26 UTC
[16/51] [partial] hbase-site git commit: Published site at
18eff3c1c337003b2a419490e621f931d16936fb.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/a8725a46/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/AnnotationReadingPriorityFunction.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/AnnotationReadingPriorityFunction.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/AnnotationReadingPriorityFunction.html
index 7d1d60f..6948cc6 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/AnnotationReadingPriorityFunction.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/AnnotationReadingPriorityFunction.html
@@ -43,270 +43,269 @@
<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.GetStoreFileRequest;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.SplitRegionRequest;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.GetRequest;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MultiRequest;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MutateRequest;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.ScanRequest;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.protobuf.generated.RPCProtos.RequestHeader;<a name="line.42"></a>
-<span class="sourceLineNo">043</span><a name="line.43"></a>
-<span class="sourceLineNo">044</span>import com.google.common.annotations.VisibleForTesting;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import com.google.protobuf.Message;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import com.google.protobuf.TextFormat;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.security.Superusers;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.security.User;<a name="line.48"></a>
-<span class="sourceLineNo">049</span><a name="line.49"></a>
-<span class="sourceLineNo">050</span>/**<a name="line.50"></a>
-<span class="sourceLineNo">051</span> * Reads special method annotations and table names to figure a priority for use by QoS facility in<a name="line.51"></a>
-<span class="sourceLineNo">052</span> * ipc; e.g: rpcs to hbase:meta get priority.<a name="line.52"></a>
-<span class="sourceLineNo">053</span> */<a name="line.53"></a>
-<span class="sourceLineNo">054</span>// TODO: Remove. This is doing way too much work just to figure a priority. Do as Elliott<a name="line.54"></a>
-<span class="sourceLineNo">055</span>// suggests and just have the client specify a priority.<a name="line.55"></a>
-<span class="sourceLineNo">056</span><a name="line.56"></a>
-<span class="sourceLineNo">057</span>//The logic for figuring out high priority RPCs is as follows:<a name="line.57"></a>
-<span class="sourceLineNo">058</span>//1. if the method is annotated with a QosPriority of QOS_HIGH,<a name="line.58"></a>
-<span class="sourceLineNo">059</span>// that is honored<a name="line.59"></a>
-<span class="sourceLineNo">060</span>//2. parse out the protobuf message and see if the request is for meta<a name="line.60"></a>
-<span class="sourceLineNo">061</span>// region, and if so, treat it as a high priority RPC<a name="line.61"></a>
-<span class="sourceLineNo">062</span>//Some optimizations for (2) are done here -<a name="line.62"></a>
-<span class="sourceLineNo">063</span>//Clients send the argument classname as part of making the RPC. The server<a name="line.63"></a>
-<span class="sourceLineNo">064</span>//decides whether to deserialize the proto argument message based on the<a name="line.64"></a>
-<span class="sourceLineNo">065</span>//pre-established set of argument classes (knownArgumentClasses below).<a name="line.65"></a>
-<span class="sourceLineNo">066</span>//This prevents the server from having to deserialize all proto argument<a name="line.66"></a>
-<span class="sourceLineNo">067</span>//messages prematurely.<a name="line.67"></a>
-<span class="sourceLineNo">068</span>//All the argument classes declare a 'getRegion' method that returns a<a name="line.68"></a>
-<span class="sourceLineNo">069</span>//RegionSpecifier object. Methods can be invoked on the returned object<a name="line.69"></a>
-<span class="sourceLineNo">070</span>//to figure out whether it is a meta region or not.<a name="line.70"></a>
-<span class="sourceLineNo">071</span>@InterfaceAudience.Private<a name="line.71"></a>
-<span class="sourceLineNo">072</span>public class AnnotationReadingPriorityFunction implements PriorityFunction {<a name="line.72"></a>
-<span class="sourceLineNo">073</span> private static final Log LOG =<a name="line.73"></a>
-<span class="sourceLineNo">074</span> LogFactory.getLog(AnnotationReadingPriorityFunction.class.getName());<a name="line.74"></a>
-<span class="sourceLineNo">075</span><a name="line.75"></a>
-<span class="sourceLineNo">076</span> /** Used to control the scan delay, currently sqrt(numNextCall * weight) */<a name="line.76"></a>
-<span class="sourceLineNo">077</span> public static final String SCAN_VTIME_WEIGHT_CONF_KEY = "hbase.ipc.server.scan.vtime.weight";<a name="line.77"></a>
-<span class="sourceLineNo">078</span><a name="line.78"></a>
-<span class="sourceLineNo">079</span> protected final Map<String, Integer> annotatedQos;<a name="line.79"></a>
-<span class="sourceLineNo">080</span> //We need to mock the regionserver instance for some unit tests (set via<a name="line.80"></a>
-<span class="sourceLineNo">081</span> //setRegionServer method.<a name="line.81"></a>
-<span class="sourceLineNo">082</span> private RSRpcServices rpcServices;<a name="line.82"></a>
-<span class="sourceLineNo">083</span> @SuppressWarnings("unchecked")<a name="line.83"></a>
-<span class="sourceLineNo">084</span> private final Class<? extends Message>[] knownArgumentClasses = new Class[]{<a name="line.84"></a>
-<span class="sourceLineNo">085</span> GetRegionInfoRequest.class,<a name="line.85"></a>
-<span class="sourceLineNo">086</span> GetStoreFileRequest.class,<a name="line.86"></a>
-<span class="sourceLineNo">087</span> CloseRegionRequest.class,<a name="line.87"></a>
-<span class="sourceLineNo">088</span> FlushRegionRequest.class,<a name="line.88"></a>
-<span class="sourceLineNo">089</span> SplitRegionRequest.class,<a name="line.89"></a>
-<span class="sourceLineNo">090</span> CompactRegionRequest.class,<a name="line.90"></a>
-<span class="sourceLineNo">091</span> GetRequest.class,<a name="line.91"></a>
-<span class="sourceLineNo">092</span> MutateRequest.class,<a name="line.92"></a>
-<span class="sourceLineNo">093</span> ScanRequest.class<a name="line.93"></a>
-<span class="sourceLineNo">094</span> };<a name="line.94"></a>
-<span class="sourceLineNo">095</span><a name="line.95"></a>
-<span class="sourceLineNo">096</span> // Some caches for helping performance<a name="line.96"></a>
-<span class="sourceLineNo">097</span> private final Map<String, Class<? extends Message>> argumentToClassMap =<a name="line.97"></a>
-<span class="sourceLineNo">098</span> new HashMap<String, Class<? extends Message>>();<a name="line.98"></a>
-<span class="sourceLineNo">099</span> private final Map<String, Map<Class<? extends Message>, Method>> methodMap =<a name="line.99"></a>
-<span class="sourceLineNo">100</span> new HashMap<String, Map<Class<? extends Message>, Method>>();<a name="line.100"></a>
-<span class="sourceLineNo">101</span><a name="line.101"></a>
-<span class="sourceLineNo">102</span> private final float scanVirtualTimeWeight;<a name="line.102"></a>
-<span class="sourceLineNo">103</span><a name="line.103"></a>
-<span class="sourceLineNo">104</span> /**<a name="line.104"></a>
-<span class="sourceLineNo">105</span> * Calls {@link #AnnotationReadingPriorityFunction(RSRpcServices, Class)} using the result of<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * {@code rpcServices#getClass()}<a name="line.106"></a>
-<span class="sourceLineNo">107</span> *<a name="line.107"></a>
-<span class="sourceLineNo">108</span> * @param rpcServices<a name="line.108"></a>
-<span class="sourceLineNo">109</span> * The RPC server implementation<a name="line.109"></a>
-<span class="sourceLineNo">110</span> */<a name="line.110"></a>
-<span class="sourceLineNo">111</span> public AnnotationReadingPriorityFunction(final RSRpcServices rpcServices) {<a name="line.111"></a>
-<span class="sourceLineNo">112</span> this(rpcServices, rpcServices.getClass());<a name="line.112"></a>
-<span class="sourceLineNo">113</span> }<a name="line.113"></a>
-<span class="sourceLineNo">114</span><a name="line.114"></a>
-<span class="sourceLineNo">115</span> /**<a name="line.115"></a>
-<span class="sourceLineNo">116</span> * Constructs the priority function given the RPC server implementation and the annotations on the<a name="line.116"></a>
-<span class="sourceLineNo">117</span> * methods in the provided {@code clz}.<a name="line.117"></a>
-<span class="sourceLineNo">118</span> *<a name="line.118"></a>
-<span class="sourceLineNo">119</span> * @param rpcServices<a name="line.119"></a>
-<span class="sourceLineNo">120</span> * The RPC server implementation<a name="line.120"></a>
-<span class="sourceLineNo">121</span> * @param clz<a name="line.121"></a>
-<span class="sourceLineNo">122</span> * The concrete RPC server implementation's class<a name="line.122"></a>
-<span class="sourceLineNo">123</span> */<a name="line.123"></a>
-<span class="sourceLineNo">124</span> public AnnotationReadingPriorityFunction(final RSRpcServices rpcServices,<a name="line.124"></a>
-<span class="sourceLineNo">125</span> Class<? extends RSRpcServices> clz) {<a name="line.125"></a>
-<span class="sourceLineNo">126</span> Map<String,Integer> qosMap = new HashMap<String,Integer>();<a name="line.126"></a>
-<span class="sourceLineNo">127</span> for (Method m : clz.getMethods()) {<a name="line.127"></a>
-<span class="sourceLineNo">128</span> QosPriority p = m.getAnnotation(QosPriority.class);<a name="line.128"></a>
-<span class="sourceLineNo">129</span> if (p != null) {<a name="line.129"></a>
-<span class="sourceLineNo">130</span> // Since we protobuf'd, and then subsequently, when we went with pb style, method names<a name="line.130"></a>
-<span class="sourceLineNo">131</span> // are capitalized. This meant that this brittle compare of method names gotten by<a name="line.131"></a>
-<span class="sourceLineNo">132</span> // reflection no longer matched the method names coming in over pb. TODO: Get rid of this<a name="line.132"></a>
-<span class="sourceLineNo">133</span> // check. For now, workaround is to capitalize the names we got from reflection so they<a name="line.133"></a>
-<span class="sourceLineNo">134</span> // have chance of matching the pb ones.<a name="line.134"></a>
-<span class="sourceLineNo">135</span> String capitalizedMethodName = capitalize(m.getName());<a name="line.135"></a>
-<span class="sourceLineNo">136</span> qosMap.put(capitalizedMethodName, p.priority());<a name="line.136"></a>
-<span class="sourceLineNo">137</span> }<a name="line.137"></a>
-<span class="sourceLineNo">138</span> }<a name="line.138"></a>
-<span class="sourceLineNo">139</span> this.rpcServices = rpcServices;<a name="line.139"></a>
-<span class="sourceLineNo">140</span> this.annotatedQos = qosMap;<a name="line.140"></a>
-<span class="sourceLineNo">141</span> if (methodMap.get("getRegion") == null) {<a name="line.141"></a>
-<span class="sourceLineNo">142</span> methodMap.put("hasRegion", new HashMap<Class<? extends Message>, Method>());<a name="line.142"></a>
-<span class="sourceLineNo">143</span> methodMap.put("getRegion", new HashMap<Class<? extends Message>, Method>());<a name="line.143"></a>
-<span class="sourceLineNo">144</span> }<a name="line.144"></a>
-<span class="sourceLineNo">145</span> for (Class<? extends Message> cls : knownArgumentClasses) {<a name="line.145"></a>
-<span class="sourceLineNo">146</span> argumentToClassMap.put(cls.getName(), cls);<a name="line.146"></a>
-<span class="sourceLineNo">147</span> try {<a name="line.147"></a>
-<span class="sourceLineNo">148</span> methodMap.get("hasRegion").put(cls, cls.getDeclaredMethod("hasRegion"));<a name="line.148"></a>
-<span class="sourceLineNo">149</span> methodMap.get("getRegion").put(cls, cls.getDeclaredMethod("getRegion"));<a name="line.149"></a>
-<span class="sourceLineNo">150</span> } catch (Exception e) {<a name="line.150"></a>
-<span class="sourceLineNo">151</span> throw new RuntimeException(e);<a name="line.151"></a>
-<span class="sourceLineNo">152</span> }<a name="line.152"></a>
-<span class="sourceLineNo">153</span> }<a name="line.153"></a>
-<span class="sourceLineNo">154</span><a name="line.154"></a>
-<span class="sourceLineNo">155</span> Configuration conf = rpcServices.getConfiguration();<a name="line.155"></a>
-<span class="sourceLineNo">156</span> scanVirtualTimeWeight = conf.getFloat(SCAN_VTIME_WEIGHT_CONF_KEY, 1.0f);<a name="line.156"></a>
-<span class="sourceLineNo">157</span> }<a name="line.157"></a>
-<span class="sourceLineNo">158</span><a name="line.158"></a>
-<span class="sourceLineNo">159</span> private String capitalize(final String s) {<a name="line.159"></a>
-<span class="sourceLineNo">160</span> StringBuilder strBuilder = new StringBuilder(s);<a name="line.160"></a>
-<span class="sourceLineNo">161</span> strBuilder.setCharAt(0, Character.toUpperCase(strBuilder.charAt(0)));<a name="line.161"></a>
-<span class="sourceLineNo">162</span> return strBuilder.toString();<a name="line.162"></a>
-<span class="sourceLineNo">163</span> }<a name="line.163"></a>
-<span class="sourceLineNo">164</span><a name="line.164"></a>
-<span class="sourceLineNo">165</span> /**<a name="line.165"></a>
-<span class="sourceLineNo">166</span> * Returns a 'priority' based on the request type.<a name="line.166"></a>
-<span class="sourceLineNo">167</span> *<a name="line.167"></a>
-<span class="sourceLineNo">168</span> * Currently the returned priority is used for queue selection.<a name="line.168"></a>
-<span class="sourceLineNo">169</span> * See the SimpleRpcScheduler as example. It maintains a queue per 'priory type'<a name="line.169"></a>
-<span class="sourceLineNo">170</span> * HIGH_QOS (meta requests), REPLICATION_QOS (replication requests),<a name="line.170"></a>
-<span class="sourceLineNo">171</span> * NORMAL_QOS (user requests).<a name="line.171"></a>
-<span class="sourceLineNo">172</span> */<a name="line.172"></a>
-<span class="sourceLineNo">173</span> @Override<a name="line.173"></a>
-<span class="sourceLineNo">174</span> public int getPriority(RequestHeader header, Message param, User user) {<a name="line.174"></a>
-<span class="sourceLineNo">175</span> int priorityByAnnotation = getAnnotatedPriority(header);<a name="line.175"></a>
-<span class="sourceLineNo">176</span><a name="line.176"></a>
-<span class="sourceLineNo">177</span> if (priorityByAnnotation >= 0) {<a name="line.177"></a>
-<span class="sourceLineNo">178</span> return priorityByAnnotation;<a name="line.178"></a>
-<span class="sourceLineNo">179</span> }<a name="line.179"></a>
-<span class="sourceLineNo">180</span><a name="line.180"></a>
-<span class="sourceLineNo">181</span> // all requests executed by super users have high QoS<a name="line.181"></a>
-<span class="sourceLineNo">182</span> try {<a name="line.182"></a>
-<span class="sourceLineNo">183</span> if (Superusers.isSuperUser(user)) {<a name="line.183"></a>
-<span class="sourceLineNo">184</span> return HConstants.ADMIN_QOS;<a name="line.184"></a>
-<span class="sourceLineNo">185</span> }<a name="line.185"></a>
-<span class="sourceLineNo">186</span> } catch (IllegalStateException ex) {<a name="line.186"></a>
-<span class="sourceLineNo">187</span> // Not good throwing an exception out of here, a runtime anyways. Let the query go into the<a name="line.187"></a>
-<span class="sourceLineNo">188</span> // server and have it throw the exception if still an issue. Just mark it normal priority.<a name="line.188"></a>
-<span class="sourceLineNo">189</span> if (LOG.isTraceEnabled()) LOG.trace("Marking normal priority after getting exception=" + ex);<a name="line.189"></a>
-<span class="sourceLineNo">190</span> return HConstants.NORMAL_QOS;<a name="line.190"></a>
-<span class="sourceLineNo">191</span> }<a name="line.191"></a>
-<span class="sourceLineNo">192</span><a name="line.192"></a>
-<span class="sourceLineNo">193</span> return getBasePriority(header, param);<a name="line.193"></a>
-<span class="sourceLineNo">194</span> }<a name="line.194"></a>
-<span class="sourceLineNo">195</span><a name="line.195"></a>
-<span class="sourceLineNo">196</span> /**<a name="line.196"></a>
-<span class="sourceLineNo">197</span> * See if the method has an annotation.<a name="line.197"></a>
-<span class="sourceLineNo">198</span> * @param header<a name="line.198"></a>
-<span class="sourceLineNo">199</span> * @return Return the priority from the annotation. If there isn't<a name="line.199"></a>
-<span class="sourceLineNo">200</span> * an annotation, this returns something below zero.<a name="line.200"></a>
-<span class="sourceLineNo">201</span> */<a name="line.201"></a>
-<span class="sourceLineNo">202</span> protected int getAnnotatedPriority(RequestHeader header) {<a name="line.202"></a>
-<span class="sourceLineNo">203</span> String methodName = header.getMethodName();<a name="line.203"></a>
-<span class="sourceLineNo">204</span> Integer priorityByAnnotation = annotatedQos.get(methodName);<a name="line.204"></a>
-<span class="sourceLineNo">205</span> if (priorityByAnnotation != null) {<a name="line.205"></a>
-<span class="sourceLineNo">206</span> return priorityByAnnotation;<a name="line.206"></a>
-<span class="sourceLineNo">207</span> }<a name="line.207"></a>
-<span class="sourceLineNo">208</span> return -1;<a name="line.208"></a>
-<span class="sourceLineNo">209</span> }<a name="line.209"></a>
-<span class="sourceLineNo">210</span><a name="line.210"></a>
-<span class="sourceLineNo">211</span> /**<a name="line.211"></a>
-<span class="sourceLineNo">212</span> * Get the priority for a given request from the header and the param<a name="line.212"></a>
-<span class="sourceLineNo">213</span> * This doesn't consider which user is sending the request at all.<a name="line.213"></a>
-<span class="sourceLineNo">214</span> * This doesn't consider annotations<a name="line.214"></a>
-<span class="sourceLineNo">215</span> */<a name="line.215"></a>
-<span class="sourceLineNo">216</span> protected int getBasePriority(RequestHeader header, Message param) {<a name="line.216"></a>
-<span class="sourceLineNo">217</span> if (param == null) {<a name="line.217"></a>
-<span class="sourceLineNo">218</span> return HConstants.NORMAL_QOS;<a name="line.218"></a>
-<span class="sourceLineNo">219</span> }<a name="line.219"></a>
-<span class="sourceLineNo">220</span> if (param instanceof MultiRequest) {<a name="line.220"></a>
-<span class="sourceLineNo">221</span> // The multi call has its priority set in the header. All calls should work this way but<a name="line.221"></a>
-<span class="sourceLineNo">222</span> // only this one has been converted so far. No priority == NORMAL_QOS.<a name="line.222"></a>
-<span class="sourceLineNo">223</span> return header.hasPriority()? header.getPriority(): HConstants.NORMAL_QOS;<a name="line.223"></a>
-<span class="sourceLineNo">224</span> }<a name="line.224"></a>
-<span class="sourceLineNo">225</span><a name="line.225"></a>
-<span class="sourceLineNo">226</span> String cls = param.getClass().getName();<a name="line.226"></a>
-<span class="sourceLineNo">227</span> Class<? extends Message> rpcArgClass = argumentToClassMap.get(cls);<a name="line.227"></a>
-<span class="sourceLineNo">228</span> RegionSpecifier regionSpecifier = null;<a name="line.228"></a>
-<span class="sourceLineNo">229</span> //check whether the request has reference to meta region or now.<a name="line.229"></a>
-<span class="sourceLineNo">230</span> try {<a name="line.230"></a>
-<span class="sourceLineNo">231</span> // Check if the param has a region specifier; the pb methods are hasRegion and getRegion if<a name="line.231"></a>
-<span class="sourceLineNo">232</span> // hasRegion returns true. Not all listed methods have region specifier each time. For<a name="line.232"></a>
-<span class="sourceLineNo">233</span> // example, the ScanRequest has it on setup but thereafter relies on the scannerid rather than<a name="line.233"></a>
-<span class="sourceLineNo">234</span> // send the region over every time.<a name="line.234"></a>
-<span class="sourceLineNo">235</span> Method hasRegion = methodMap.get("hasRegion").get(rpcArgClass);<a name="line.235"></a>
-<span class="sourceLineNo">236</span> if (hasRegion != null && (Boolean)hasRegion.invoke(param, (Object[])null)) {<a name="line.236"></a>
-<span class="sourceLineNo">237</span> Method getRegion = methodMap.get("getRegion").get(rpcArgClass);<a name="line.237"></a>
-<span class="sourceLineNo">238</span> regionSpecifier = (RegionSpecifier)getRegion.invoke(param, (Object[])null);<a name="line.238"></a>
-<span class="sourceLineNo">239</span> Region region = rpcServices.getRegion(regionSpecifier);<a name="line.239"></a>
-<span class="sourceLineNo">240</span> if (region.getRegionInfo().isSystemTable()) {<a name="line.240"></a>
-<span class="sourceLineNo">241</span> if (LOG.isTraceEnabled()) {<a name="line.241"></a>
-<span class="sourceLineNo">242</span> LOG.trace("High priority because region=" +<a name="line.242"></a>
-<span class="sourceLineNo">243</span> region.getRegionInfo().getRegionNameAsString());<a name="line.243"></a>
-<span class="sourceLineNo">244</span> }<a name="line.244"></a>
-<span class="sourceLineNo">245</span> return HConstants.SYSTEMTABLE_QOS;<a name="line.245"></a>
-<span class="sourceLineNo">246</span> }<a name="line.246"></a>
-<span class="sourceLineNo">247</span> }<a name="line.247"></a>
-<span class="sourceLineNo">248</span> } catch (Exception ex) {<a name="line.248"></a>
-<span class="sourceLineNo">249</span> // Not good throwing an exception out of here, a runtime anyways. Let the query go into the<a name="line.249"></a>
-<span class="sourceLineNo">250</span> // server and have it throw the exception if still an issue. Just mark it normal priority.<a name="line.250"></a>
-<span class="sourceLineNo">251</span> if (LOG.isTraceEnabled()) LOG.trace("Marking normal priority after getting exception=" + ex);<a name="line.251"></a>
-<span class="sourceLineNo">252</span> return HConstants.NORMAL_QOS;<a name="line.252"></a>
-<span class="sourceLineNo">253</span> }<a name="line.253"></a>
-<span class="sourceLineNo">254</span><a name="line.254"></a>
-<span class="sourceLineNo">255</span> if (param instanceof ScanRequest) { // scanner methods...<a name="line.255"></a>
-<span class="sourceLineNo">256</span> ScanRequest request = (ScanRequest)param;<a name="line.256"></a>
-<span class="sourceLineNo">257</span> if (!request.hasScannerId()) {<a name="line.257"></a>
-<span class="sourceLineNo">258</span> return HConstants.NORMAL_QOS;<a name="line.258"></a>
-<span class="sourceLineNo">259</span> }<a name="line.259"></a>
-<span class="sourceLineNo">260</span> RegionScanner scanner = rpcServices.getScanner(request.getScannerId());<a name="line.260"></a>
-<span class="sourceLineNo">261</span> if (scanner != null && scanner.getRegionInfo().isSystemTable()) {<a name="line.261"></a>
-<span class="sourceLineNo">262</span> if (LOG.isTraceEnabled()) {<a name="line.262"></a>
-<span class="sourceLineNo">263</span> // Scanner requests are small in size so TextFormat version should not overwhelm log.<a name="line.263"></a>
-<span class="sourceLineNo">264</span> LOG.trace("High priority scanner request " + TextFormat.shortDebugString(request));<a name="line.264"></a>
-<span class="sourceLineNo">265</span> }<a name="line.265"></a>
-<span class="sourceLineNo">266</span> return HConstants.SYSTEMTABLE_QOS;<a name="line.266"></a>
-<span class="sourceLineNo">267</span> }<a name="line.267"></a>
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-<span class="sourceLineNo">269</span><a name="line.269"></a>
-<span class="sourceLineNo">270</span> return HConstants.NORMAL_QOS;<a name="line.270"></a>
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-<span class="sourceLineNo">272</span><a name="line.272"></a>
-<span class="sourceLineNo">273</span> /**<a name="line.273"></a>
-<span class="sourceLineNo">274</span> * Based on the request content, returns the deadline of the request.<a name="line.274"></a>
-<span class="sourceLineNo">275</span> *<a name="line.275"></a>
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-<span class="sourceLineNo">278</span> * @return Deadline of this request. 0 now, otherwise msec of 'delay'<a name="line.278"></a>
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-<span class="sourceLineNo">281</span> public long getDeadline(RequestHeader header, Message param) {<a name="line.281"></a>
-<span class="sourceLineNo">282</span> if (param instanceof ScanRequest) {<a name="line.282"></a>
-<span class="sourceLineNo">283</span> ScanRequest request = (ScanRequest)param;<a name="line.283"></a>
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-<span class="sourceLineNo">288</span> // get the 'virtual time' of the scanner, and applies sqrt() to get a<a name="line.288"></a>
-<span class="sourceLineNo">289</span> // nice curve for the delay. More a scanner is used the less priority it gets.<a name="line.289"></a>
-<span class="sourceLineNo">290</span> // The weight is used to have more control on the delay.<a name="line.290"></a>
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-<span class="sourceLineNo">292</span> return Math.round(Math.sqrt(vtime * scanVirtualTimeWeight));<a name="line.292"></a>
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-<span class="sourceLineNo">299</span> this.rpcServices = hrs.getRSRpcServices();<a name="line.299"></a>
-<span class="sourceLineNo">300</span> }<a name="line.300"></a>
-<span class="sourceLineNo">301</span>}<a name="line.301"></a>
+<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MutateRequest;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.ScanRequest;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionSpecifier;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.protobuf.generated.RPCProtos.RequestHeader;<a name="line.41"></a>
+<span class="sourceLineNo">042</span><a name="line.42"></a>
+<span class="sourceLineNo">043</span>import com.google.common.annotations.VisibleForTesting;<a name="line.43"></a>
+<span class="sourceLineNo">044</span>import com.google.protobuf.Message;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import com.google.protobuf.TextFormat;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.security.Superusers;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.security.User;<a name="line.47"></a>
+<span class="sourceLineNo">048</span><a name="line.48"></a>
+<span class="sourceLineNo">049</span>/**<a name="line.49"></a>
+<span class="sourceLineNo">050</span> * Reads special method annotations and table names to figure a priority for use by QoS facility in<a name="line.50"></a>
+<span class="sourceLineNo">051</span> * ipc; e.g: rpcs to hbase:meta get priority.<a name="line.51"></a>
+<span class="sourceLineNo">052</span> */<a name="line.52"></a>
+<span class="sourceLineNo">053</span>// TODO: Remove. This is doing way too much work just to figure a priority. Do as Elliott<a name="line.53"></a>
+<span class="sourceLineNo">054</span>// suggests and just have the client specify a priority.<a name="line.54"></a>
+<span class="sourceLineNo">055</span><a name="line.55"></a>
+<span class="sourceLineNo">056</span>//The logic for figuring out high priority RPCs is as follows:<a name="line.56"></a>
+<span class="sourceLineNo">057</span>//1. if the method is annotated with a QosPriority of QOS_HIGH,<a name="line.57"></a>
+<span class="sourceLineNo">058</span>// that is honored<a name="line.58"></a>
+<span class="sourceLineNo">059</span>//2. parse out the protobuf message and see if the request is for meta<a name="line.59"></a>
+<span class="sourceLineNo">060</span>// region, and if so, treat it as a high priority RPC<a name="line.60"></a>
+<span class="sourceLineNo">061</span>//Some optimizations for (2) are done here -<a name="line.61"></a>
+<span class="sourceLineNo">062</span>//Clients send the argument classname as part of making the RPC. The server<a name="line.62"></a>
+<span class="sourceLineNo">063</span>//decides whether to deserialize the proto argument message based on the<a name="line.63"></a>
+<span class="sourceLineNo">064</span>//pre-established set of argument classes (knownArgumentClasses below).<a name="line.64"></a>
+<span class="sourceLineNo">065</span>//This prevents the server from having to deserialize all proto argument<a name="line.65"></a>
+<span class="sourceLineNo">066</span>//messages prematurely.<a name="line.66"></a>
+<span class="sourceLineNo">067</span>//All the argument classes declare a 'getRegion' method that returns a<a name="line.67"></a>
+<span class="sourceLineNo">068</span>//RegionSpecifier object. Methods can be invoked on the returned object<a name="line.68"></a>
+<span class="sourceLineNo">069</span>//to figure out whether it is a meta region or not.<a name="line.69"></a>
+<span class="sourceLineNo">070</span>@InterfaceAudience.Private<a name="line.70"></a>
+<span class="sourceLineNo">071</span>public class AnnotationReadingPriorityFunction implements PriorityFunction {<a name="line.71"></a>
+<span class="sourceLineNo">072</span> private static final Log LOG =<a name="line.72"></a>
+<span class="sourceLineNo">073</span> LogFactory.getLog(AnnotationReadingPriorityFunction.class.getName());<a name="line.73"></a>
+<span class="sourceLineNo">074</span><a name="line.74"></a>
+<span class="sourceLineNo">075</span> /** Used to control the scan delay, currently sqrt(numNextCall * weight) */<a name="line.75"></a>
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+<span class="sourceLineNo">077</span><a name="line.77"></a>
+<span class="sourceLineNo">078</span> protected final Map<String, Integer> annotatedQos;<a name="line.78"></a>
+<span class="sourceLineNo">079</span> //We need to mock the regionserver instance for some unit tests (set via<a name="line.79"></a>
+<span class="sourceLineNo">080</span> //setRegionServer method.<a name="line.80"></a>
+<span class="sourceLineNo">081</span> private RSRpcServices rpcServices;<a name="line.81"></a>
+<span class="sourceLineNo">082</span> @SuppressWarnings("unchecked")<a name="line.82"></a>
+<span class="sourceLineNo">083</span> private final Class<? extends Message>[] knownArgumentClasses = new Class[]{<a name="line.83"></a>
+<span class="sourceLineNo">084</span> GetRegionInfoRequest.class,<a name="line.84"></a>
+<span class="sourceLineNo">085</span> GetStoreFileRequest.class,<a name="line.85"></a>
+<span class="sourceLineNo">086</span> CloseRegionRequest.class,<a name="line.86"></a>
+<span class="sourceLineNo">087</span> FlushRegionRequest.class,<a name="line.87"></a>
+<span class="sourceLineNo">088</span> SplitRegionRequest.class,<a name="line.88"></a>
+<span class="sourceLineNo">089</span> CompactRegionRequest.class,<a name="line.89"></a>
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+<span class="sourceLineNo">092</span> ScanRequest.class<a name="line.92"></a>
+<span class="sourceLineNo">093</span> };<a name="line.93"></a>
+<span class="sourceLineNo">094</span><a name="line.94"></a>
+<span class="sourceLineNo">095</span> // Some caches for helping performance<a name="line.95"></a>
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+<span class="sourceLineNo">097</span> new HashMap<String, Class<? extends Message>>();<a name="line.97"></a>
+<span class="sourceLineNo">098</span> private final Map<String, Map<Class<? extends Message>, Method>> methodMap =<a name="line.98"></a>
+<span class="sourceLineNo">099</span> new HashMap<String, Map<Class<? extends Message>, Method>>();<a name="line.99"></a>
+<span class="sourceLineNo">100</span><a name="line.100"></a>
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+<span class="sourceLineNo">102</span><a name="line.102"></a>
+<span class="sourceLineNo">103</span> /**<a name="line.103"></a>
+<span class="sourceLineNo">104</span> * Calls {@link #AnnotationReadingPriorityFunction(RSRpcServices, Class)} using the result of<a name="line.104"></a>
+<span class="sourceLineNo">105</span> * {@code rpcServices#getClass()}<a name="line.105"></a>
+<span class="sourceLineNo">106</span> *<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * @param rpcServices<a name="line.107"></a>
+<span class="sourceLineNo">108</span> * The RPC server implementation<a name="line.108"></a>
+<span class="sourceLineNo">109</span> */<a name="line.109"></a>
+<span class="sourceLineNo">110</span> public AnnotationReadingPriorityFunction(final RSRpcServices rpcServices) {<a name="line.110"></a>
+<span class="sourceLineNo">111</span> this(rpcServices, rpcServices.getClass());<a name="line.111"></a>
+<span class="sourceLineNo">112</span> }<a name="line.112"></a>
+<span class="sourceLineNo">113</span><a name="line.113"></a>
+<span class="sourceLineNo">114</span> /**<a name="line.114"></a>
+<span class="sourceLineNo">115</span> * Constructs the priority function given the RPC server implementation and the annotations on the<a name="line.115"></a>
+<span class="sourceLineNo">116</span> * methods in the provided {@code clz}.<a name="line.116"></a>
+<span class="sourceLineNo">117</span> *<a name="line.117"></a>
+<span class="sourceLineNo">118</span> * @param rpcServices<a name="line.118"></a>
+<span class="sourceLineNo">119</span> * The RPC server implementation<a name="line.119"></a>
+<span class="sourceLineNo">120</span> * @param clz<a name="line.120"></a>
+<span class="sourceLineNo">121</span> * The concrete RPC server implementation's class<a name="line.121"></a>
+<span class="sourceLineNo">122</span> */<a name="line.122"></a>
+<span class="sourceLineNo">123</span> public AnnotationReadingPriorityFunction(final RSRpcServices rpcServices,<a name="line.123"></a>
+<span class="sourceLineNo">124</span> Class<? extends RSRpcServices> clz) {<a name="line.124"></a>
+<span class="sourceLineNo">125</span> Map<String,Integer> qosMap = new HashMap<String,Integer>();<a name="line.125"></a>
+<span class="sourceLineNo">126</span> for (Method m : clz.getMethods()) {<a name="line.126"></a>
+<span class="sourceLineNo">127</span> QosPriority p = m.getAnnotation(QosPriority.class);<a name="line.127"></a>
+<span class="sourceLineNo">128</span> if (p != null) {<a name="line.128"></a>
+<span class="sourceLineNo">129</span> // Since we protobuf'd, and then subsequently, when we went with pb style, method names<a name="line.129"></a>
+<span class="sourceLineNo">130</span> // are capitalized. This meant that this brittle compare of method names gotten by<a name="line.130"></a>
+<span class="sourceLineNo">131</span> // reflection no longer matched the method names coming in over pb. TODO: Get rid of this<a name="line.131"></a>
+<span class="sourceLineNo">132</span> // check. For now, workaround is to capitalize the names we got from reflection so they<a name="line.132"></a>
+<span class="sourceLineNo">133</span> // have chance of matching the pb ones.<a name="line.133"></a>
+<span class="sourceLineNo">134</span> String capitalizedMethodName = capitalize(m.getName());<a name="line.134"></a>
+<span class="sourceLineNo">135</span> qosMap.put(capitalizedMethodName, p.priority());<a name="line.135"></a>
+<span class="sourceLineNo">136</span> }<a name="line.136"></a>
+<span class="sourceLineNo">137</span> }<a name="line.137"></a>
+<span class="sourceLineNo">138</span> this.rpcServices = rpcServices;<a name="line.138"></a>
+<span class="sourceLineNo">139</span> this.annotatedQos = qosMap;<a name="line.139"></a>
+<span class="sourceLineNo">140</span> if (methodMap.get("getRegion") == null) {<a name="line.140"></a>
+<span class="sourceLineNo">141</span> methodMap.put("hasRegion", new HashMap<Class<? extends Message>, Method>());<a name="line.141"></a>
+<span class="sourceLineNo">142</span> methodMap.put("getRegion", new HashMap<Class<? extends Message>, Method>());<a name="line.142"></a>
+<span class="sourceLineNo">143</span> }<a name="line.143"></a>
+<span class="sourceLineNo">144</span> for (Class<? extends Message> cls : knownArgumentClasses) {<a name="line.144"></a>
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+<span class="sourceLineNo">146</span> try {<a name="line.146"></a>
+<span class="sourceLineNo">147</span> methodMap.get("hasRegion").put(cls, cls.getDeclaredMethod("hasRegion"));<a name="line.147"></a>
+<span class="sourceLineNo">148</span> methodMap.get("getRegion").put(cls, cls.getDeclaredMethod("getRegion"));<a name="line.148"></a>
+<span class="sourceLineNo">149</span> } catch (Exception e) {<a name="line.149"></a>
+<span class="sourceLineNo">150</span> throw new RuntimeException(e);<a name="line.150"></a>
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+<span class="sourceLineNo">154</span> Configuration conf = rpcServices.getConfiguration();<a name="line.154"></a>
+<span class="sourceLineNo">155</span> scanVirtualTimeWeight = conf.getFloat(SCAN_VTIME_WEIGHT_CONF_KEY, 1.0f);<a name="line.155"></a>
+<span class="sourceLineNo">156</span> }<a name="line.156"></a>
+<span class="sourceLineNo">157</span><a name="line.157"></a>
+<span class="sourceLineNo">158</span> private String capitalize(final String s) {<a name="line.158"></a>
+<span class="sourceLineNo">159</span> StringBuilder strBuilder = new StringBuilder(s);<a name="line.159"></a>
+<span class="sourceLineNo">160</span> strBuilder.setCharAt(0, Character.toUpperCase(strBuilder.charAt(0)));<a name="line.160"></a>
+<span class="sourceLineNo">161</span> return strBuilder.toString();<a name="line.161"></a>
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+<span class="sourceLineNo">163</span><a name="line.163"></a>
+<span class="sourceLineNo">164</span> /**<a name="line.164"></a>
+<span class="sourceLineNo">165</span> * Returns a 'priority' based on the request type.<a name="line.165"></a>
+<span class="sourceLineNo">166</span> *<a name="line.166"></a>
+<span class="sourceLineNo">167</span> * Currently the returned priority is used for queue selection.<a name="line.167"></a>
+<span class="sourceLineNo">168</span> * See the SimpleRpcScheduler as example. It maintains a queue per 'priory type'<a name="line.168"></a>
+<span class="sourceLineNo">169</span> * HIGH_QOS (meta requests), REPLICATION_QOS (replication requests),<a name="line.169"></a>
+<span class="sourceLineNo">170</span> * NORMAL_QOS (user requests).<a name="line.170"></a>
+<span class="sourceLineNo">171</span> */<a name="line.171"></a>
+<span class="sourceLineNo">172</span> @Override<a name="line.172"></a>
+<span class="sourceLineNo">173</span> public int getPriority(RequestHeader header, Message param, User user) {<a name="line.173"></a>
+<span class="sourceLineNo">174</span> int priorityByAnnotation = getAnnotatedPriority(header);<a name="line.174"></a>
+<span class="sourceLineNo">175</span><a name="line.175"></a>
+<span class="sourceLineNo">176</span> if (priorityByAnnotation >= 0) {<a name="line.176"></a>
+<span class="sourceLineNo">177</span> return priorityByAnnotation;<a name="line.177"></a>
+<span class="sourceLineNo">178</span> }<a name="line.178"></a>
+<span class="sourceLineNo">179</span><a name="line.179"></a>
+<span class="sourceLineNo">180</span> // all requests executed by super users have high QoS<a name="line.180"></a>
+<span class="sourceLineNo">181</span> try {<a name="line.181"></a>
+<span class="sourceLineNo">182</span> if (Superusers.isSuperUser(user)) {<a name="line.182"></a>
+<span class="sourceLineNo">183</span> return HConstants.ADMIN_QOS;<a name="line.183"></a>
+<span class="sourceLineNo">184</span> }<a name="line.184"></a>
+<span class="sourceLineNo">185</span> } catch (IllegalStateException ex) {<a name="line.185"></a>
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+<span class="sourceLineNo">187</span> // server and have it throw the exception if still an issue. Just mark it normal priority.<a name="line.187"></a>
+<span class="sourceLineNo">188</span> if (LOG.isTraceEnabled()) LOG.trace("Marking normal priority after getting exception=" + ex);<a name="line.188"></a>
+<span class="sourceLineNo">189</span> return HConstants.NORMAL_QOS;<a name="line.189"></a>
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+<span class="sourceLineNo">195</span> /**<a name="line.195"></a>
+<span class="sourceLineNo">196</span> * See if the method has an annotation.<a name="line.196"></a>
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+<span class="sourceLineNo">199</span> * an annotation, this returns something below zero.<a name="line.199"></a>
+<span class="sourceLineNo">200</span> */<a name="line.200"></a>
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+<span class="sourceLineNo">203</span> Integer priorityByAnnotation = annotatedQos.get(methodName);<a name="line.203"></a>
+<span class="sourceLineNo">204</span> if (priorityByAnnotation != null) {<a name="line.204"></a>
+<span class="sourceLineNo">205</span> return priorityByAnnotation;<a name="line.205"></a>
+<span class="sourceLineNo">206</span> }<a name="line.206"></a>
+<span class="sourceLineNo">207</span> return -1;<a name="line.207"></a>
+<span class="sourceLineNo">208</span> }<a name="line.208"></a>
+<span class="sourceLineNo">209</span><a name="line.209"></a>
+<span class="sourceLineNo">210</span> /**<a name="line.210"></a>
+<span class="sourceLineNo">211</span> * Get the priority for a given request from the header and the param<a name="line.211"></a>
+<span class="sourceLineNo">212</span> * This doesn't consider which user is sending the request at all.<a name="line.212"></a>
+<span class="sourceLineNo">213</span> * This doesn't consider annotations<a name="line.213"></a>
+<span class="sourceLineNo">214</span> */<a name="line.214"></a>
+<span class="sourceLineNo">215</span> protected int getBasePriority(RequestHeader header, Message param) {<a name="line.215"></a>
+<span class="sourceLineNo">216</span> if (param == null) {<a name="line.216"></a>
+<span class="sourceLineNo">217</span> return HConstants.NORMAL_QOS;<a name="line.217"></a>
+<span class="sourceLineNo">218</span> }<a name="line.218"></a>
+<span class="sourceLineNo">219</span><a name="line.219"></a>
+<span class="sourceLineNo">220</span> // Trust the client-set priorities if set<a name="line.220"></a>
+<span class="sourceLineNo">221</span> if (header.hasPriority()) {<a name="line.221"></a>
+<span class="sourceLineNo">222</span> return header.getPriority();<a name="line.222"></a>
+<span class="sourceLineNo">223</span> }<a name="line.223"></a>
+<span class="sourceLineNo">224</span><a name="line.224"></a>
+<span class="sourceLineNo">225</span> String cls = param.getClass().getName();<a name="line.225"></a>
+<span class="sourceLineNo">226</span> Class<? extends Message> rpcArgClass = argumentToClassMap.get(cls);<a name="line.226"></a>
+<span class="sourceLineNo">227</span> RegionSpecifier regionSpecifier = null;<a name="line.227"></a>
+<span class="sourceLineNo">228</span> //check whether the request has reference to meta region or now.<a name="line.228"></a>
+<span class="sourceLineNo">229</span> try {<a name="line.229"></a>
+<span class="sourceLineNo">230</span> // Check if the param has a region specifier; the pb methods are hasRegion and getRegion if<a name="line.230"></a>
+<span class="sourceLineNo">231</span> // hasRegion returns true. Not all listed methods have region specifier each time. For<a name="line.231"></a>
+<span class="sourceLineNo">232</span> // example, the ScanRequest has it on setup but thereafter relies on the scannerid rather than<a name="line.232"></a>
+<span class="sourceLineNo">233</span> // send the region over every time.<a name="line.233"></a>
+<span class="sourceLineNo">234</span> Method hasRegion = methodMap.get("hasRegion").get(rpcArgClass);<a name="line.234"></a>
+<span class="sourceLineNo">235</span> if (hasRegion != null && (Boolean)hasRegion.invoke(param, (Object[])null)) {<a name="line.235"></a>
+<span class="sourceLineNo">236</span> Method getRegion = methodMap.get("getRegion").get(rpcArgClass);<a name="line.236"></a>
+<span class="sourceLineNo">237</span> regionSpecifier = (RegionSpecifier)getRegion.invoke(param, (Object[])null);<a name="line.237"></a>
+<span class="sourceLineNo">238</span> Region region = rpcServices.getRegion(regionSpecifier);<a name="line.238"></a>
+<span class="sourceLineNo">239</span> if (region.getRegionInfo().isSystemTable()) {<a name="line.239"></a>
+<span class="sourceLineNo">240</span> if (LOG.isTraceEnabled()) {<a name="line.240"></a>
+<span class="sourceLineNo">241</span> LOG.trace("High priority because region=" +<a name="line.241"></a>
+<span class="sourceLineNo">242</span> region.getRegionInfo().getRegionNameAsString());<a name="line.242"></a>
+<span class="sourceLineNo">243</span> }<a name="line.243"></a>
+<span class="sourceLineNo">244</span> return HConstants.SYSTEMTABLE_QOS;<a name="line.244"></a>
+<span class="sourceLineNo">245</span> }<a name="line.245"></a>
+<span class="sourceLineNo">246</span> }<a name="line.246"></a>
+<span class="sourceLineNo">247</span> } catch (Exception ex) {<a name="line.247"></a>
+<span class="sourceLineNo">248</span> // Not good throwing an exception out of here, a runtime anyways. Let the query go into the<a name="line.248"></a>
+<span class="sourceLineNo">249</span> // server and have it throw the exception if still an issue. Just mark it normal priority.<a name="line.249"></a>
+<span class="sourceLineNo">250</span> if (LOG.isTraceEnabled()) LOG.trace("Marking normal priority after getting exception=" + ex);<a name="line.250"></a>
+<span class="sourceLineNo">251</span> return HConstants.NORMAL_QOS;<a name="line.251"></a>
+<span class="sourceLineNo">252</span> }<a name="line.252"></a>
+<span class="sourceLineNo">253</span><a name="line.253"></a>
+<span class="sourceLineNo">254</span> if (param instanceof ScanRequest) { // scanner methods...<a name="line.254"></a>
+<span class="sourceLineNo">255</span> ScanRequest request = (ScanRequest)param;<a name="line.255"></a>
+<span class="sourceLineNo">256</span> if (!request.hasScannerId()) {<a name="line.256"></a>
+<span class="sourceLineNo">257</span> return HConstants.NORMAL_QOS;<a name="line.257"></a>
+<span class="sourceLineNo">258</span> }<a name="line.258"></a>
+<span class="sourceLineNo">259</span> RegionScanner scanner = rpcServices.getScanner(request.getScannerId());<a name="line.259"></a>
+<span class="sourceLineNo">260</span> if (scanner != null && scanner.getRegionInfo().isSystemTable()) {<a name="line.260"></a>
+<span class="sourceLineNo">261</span> if (LOG.isTraceEnabled()) {<a name="line.261"></a>
+<span class="sourceLineNo">262</span> // Scanner requests are small in size so TextFormat version should not overwhelm log.<a name="line.262"></a>
+<span class="sourceLineNo">263</span> LOG.trace("High priority scanner request " + TextFormat.shortDebugString(request));<a name="line.263"></a>
+<span class="sourceLineNo">264</span> }<a name="line.264"></a>
+<span class="sourceLineNo">265</span> return HConstants.SYSTEMTABLE_QOS;<a name="line.265"></a>
+<span class="sourceLineNo">266</span> }<a name="line.266"></a>
+<span class="sourceLineNo">267</span> }<a name="line.267"></a>
+<span class="sourceLineNo">268</span><a name="line.268"></a>
+<span class="sourceLineNo">269</span> return HConstants.NORMAL_QOS;<a name="line.269"></a>
+<span class="sourceLineNo">270</span> }<a name="line.270"></a>
+<span class="sourceLineNo">271</span><a name="line.271"></a>
+<span class="sourceLineNo">272</span> /**<a name="line.272"></a>
+<span class="sourceLineNo">273</span> * Based on the request content, returns the deadline of the request.<a name="line.273"></a>
+<span class="sourceLineNo">274</span> *<a name="line.274"></a>
+<span class="sourceLineNo">275</span> * @param header<a name="line.275"></a>
+<span class="sourceLineNo">276</span> * @param param<a name="line.276"></a>
+<span class="sourceLineNo">277</span> * @return Deadline of this request. 0 now, otherwise msec of 'delay'<a name="line.277"></a>
+<span class="sourceLineNo">278</span> */<a name="line.278"></a>
+<span class="sourceLineNo">279</span> @Override<a name="line.279"></a>
+<span class="sourceLineNo">280</span> public long getDeadline(RequestHeader header, Message param) {<a name="line.280"></a>
+<span class="sourceLineNo">281</span> if (param instanceof ScanRequest) {<a name="line.281"></a>
+<span class="sourceLineNo">282</span> ScanRequest request = (ScanRequest)param;<a name="line.282"></a>
+<span class="sourceLineNo">283</span> if (!request.hasScannerId()) {<a name="line.283"></a>
+<span class="sourceLineNo">284</span> return 0;<a name="line.284"></a>
+<span class="sourceLineNo">285</span> }<a name="line.285"></a>
+<span class="sourceLineNo">286</span><a name="line.286"></a>
+<span class="sourceLineNo">287</span> // get the 'virtual time' of the scanner, and applies sqrt() to get a<a name="line.287"></a>
+<span class="sourceLineNo">288</span> // nice curve for the delay. More a scanner is used the less priority it gets.<a name="line.288"></a>
+<span class="sourceLineNo">289</span> // The weight is used to have more control on the delay.<a name="line.289"></a>
+<span class="sourceLineNo">290</span> long vtime = rpcServices.getScannerVirtualTime(request.getScannerId());<a name="line.290"></a>
+<span class="sourceLineNo">291</span> return Math.round(Math.sqrt(vtime * scanVirtualTimeWeight));<a name="line.291"></a>
+<span class="sourceLineNo">292</span> }<a name="line.292"></a>
+<span class="sourceLineNo">293</span> return 0;<a name="line.293"></a>
+<span class="sourceLineNo">294</span> }<a name="line.294"></a>
+<span class="sourceLineNo">295</span><a name="line.295"></a>
+<span class="sourceLineNo">296</span> @VisibleForTesting<a name="line.296"></a>
+<span class="sourceLineNo">297</span> void setRegionServer(final HRegionServer hrs) {<a name="line.297"></a>
+<span class="sourceLineNo">298</span> this.rpcServices = hrs.getRSRpcServices();<a name="line.298"></a>
+<span class="sourceLineNo">299</span> }<a name="line.299"></a>
+<span class="sourceLineNo">300</span>}<a name="line.300"></a>