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Posted to commits@hbase.apache.org by mi...@apache.org on 2016/03/21 17:17:30 UTC
[16/23] hbase-site git commit: Published site at
f1d453599a944440b8a1075082e2dc7b7676416f.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/a4cb7eaa/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
index fbebf75..07200f2 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/SnapshotManager.html
@@ -73,1065 +73,1105 @@
<span class="sourceLineNo">065</span>import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.ProcedureDescription;<a name="line.65"></a>
<span class="sourceLineNo">066</span>import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;<a name="line.66"></a>
<span class="sourceLineNo">067</span>import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription.Type;<a name="line.67"></a>
-<span class="sourceLineNo">068</span>import org.apache.hadoop.hbase.security.AccessDeniedException;<a name="line.68"></a>
-<span class="sourceLineNo">069</span>import org.apache.hadoop.hbase.security.User;<a name="line.69"></a>
-<span class="sourceLineNo">070</span>import org.apache.hadoop.hbase.snapshot.ClientSnapshotDescriptionUtils;<a name="line.70"></a>
-<span class="sourceLineNo">071</span>import org.apache.hadoop.hbase.snapshot.HBaseSnapshotException;<a name="line.71"></a>
-<span class="sourceLineNo">072</span>import org.apache.hadoop.hbase.snapshot.RestoreSnapshotException;<a name="line.72"></a>
-<span class="sourceLineNo">073</span>import org.apache.hadoop.hbase.snapshot.SnapshotCreationException;<a name="line.73"></a>
-<span class="sourceLineNo">074</span>import org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;<a name="line.74"></a>
-<span class="sourceLineNo">075</span>import org.apache.hadoop.hbase.snapshot.SnapshotDoesNotExistException;<a name="line.75"></a>
-<span class="sourceLineNo">076</span>import org.apache.hadoop.hbase.snapshot.SnapshotExistsException;<a name="line.76"></a>
-<span class="sourceLineNo">077</span>import org.apache.hadoop.hbase.snapshot.SnapshotManifest;<a name="line.77"></a>
-<span class="sourceLineNo">078</span>import org.apache.hadoop.hbase.snapshot.SnapshotReferenceUtil;<a name="line.78"></a>
-<span class="sourceLineNo">079</span>import org.apache.hadoop.hbase.snapshot.TablePartiallyOpenException;<a name="line.79"></a>
-<span class="sourceLineNo">080</span>import org.apache.hadoop.hbase.snapshot.UnknownSnapshotException;<a name="line.80"></a>
-<span class="sourceLineNo">081</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.81"></a>
-<span class="sourceLineNo">082</span>import org.apache.hadoop.hbase.util.FSUtils;<a name="line.82"></a>
-<span class="sourceLineNo">083</span>import org.apache.zookeeper.KeeperException;<a name="line.83"></a>
-<span class="sourceLineNo">084</span><a name="line.84"></a>
-<span class="sourceLineNo">085</span>/**<a name="line.85"></a>
-<span class="sourceLineNo">086</span> * This class manages the procedure of taking and restoring snapshots. There is only one<a name="line.86"></a>
-<span class="sourceLineNo">087</span> * SnapshotManager for the master.<a name="line.87"></a>
-<span class="sourceLineNo">088</span> * <p><a name="line.88"></a>
-<span class="sourceLineNo">089</span> * The class provides methods for monitoring in-progress snapshot actions.<a name="line.89"></a>
-<span class="sourceLineNo">090</span> * <p><a name="line.90"></a>
-<span class="sourceLineNo">091</span> * Note: Currently there can only be one snapshot being taken at a time over the cluster. This is a<a name="line.91"></a>
-<span class="sourceLineNo">092</span> * simplification in the current implementation.<a name="line.92"></a>
-<span class="sourceLineNo">093</span> */<a name="line.93"></a>
-<span class="sourceLineNo">094</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.94"></a>
-<span class="sourceLineNo">095</span>@InterfaceStability.Unstable<a name="line.95"></a>
-<span class="sourceLineNo">096</span>public class SnapshotManager extends MasterProcedureManager implements Stoppable {<a name="line.96"></a>
-<span class="sourceLineNo">097</span> private static final Log LOG = LogFactory.getLog(SnapshotManager.class);<a name="line.97"></a>
-<span class="sourceLineNo">098</span><a name="line.98"></a>
-<span class="sourceLineNo">099</span> /** By default, check to see if the snapshot is complete every WAKE MILLIS (ms) */<a name="line.99"></a>
-<span class="sourceLineNo">100</span> private static final int SNAPSHOT_WAKE_MILLIS_DEFAULT = 500;<a name="line.100"></a>
-<span class="sourceLineNo">101</span><a name="line.101"></a>
-<span class="sourceLineNo">102</span> /**<a name="line.102"></a>
-<span class="sourceLineNo">103</span> * Wait time before removing a finished sentinel from the in-progress map<a name="line.103"></a>
-<span class="sourceLineNo">104</span> *<a name="line.104"></a>
-<span class="sourceLineNo">105</span> * NOTE: This is used as a safety auto cleanup.<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * The snapshot and restore handlers map entries are removed when a user asks if a snapshot or<a name="line.106"></a>
-<span class="sourceLineNo">107</span> * restore is completed. This operation is part of the HBaseAdmin snapshot/restore API flow.<a name="line.107"></a>
-<span class="sourceLineNo">108</span> * In case something fails on the client side and the snapshot/restore state is not reclaimed<a name="line.108"></a>
-<span class="sourceLineNo">109</span> * after a default timeout, the entry is removed from the in-progress map.<a name="line.109"></a>
-<span class="sourceLineNo">110</span> * At this point, if the user asks for the snapshot/restore status, the result will be<a name="line.110"></a>
-<span class="sourceLineNo">111</span> * snapshot done if exists or failed if it doesn't exists.<a name="line.111"></a>
-<span class="sourceLineNo">112</span> */<a name="line.112"></a>
-<span class="sourceLineNo">113</span> private static final int SNAPSHOT_SENTINELS_CLEANUP_TIMEOUT = 60 * 1000;<a name="line.113"></a>
-<span class="sourceLineNo">114</span><a name="line.114"></a>
-<span class="sourceLineNo">115</span> /** Enable or disable snapshot support */<a name="line.115"></a>
-<span class="sourceLineNo">116</span> public static final String HBASE_SNAPSHOT_ENABLED = "hbase.snapshot.enabled";<a name="line.116"></a>
-<span class="sourceLineNo">117</span><a name="line.117"></a>
-<span class="sourceLineNo">118</span> /**<a name="line.118"></a>
-<span class="sourceLineNo">119</span> * Conf key for # of ms elapsed between checks for snapshot errors while waiting for<a name="line.119"></a>
-<span class="sourceLineNo">120</span> * completion.<a name="line.120"></a>
-<span class="sourceLineNo">121</span> */<a name="line.121"></a>
-<span class="sourceLineNo">122</span> private static final String SNAPSHOT_WAKE_MILLIS_KEY = "hbase.snapshot.master.wakeMillis";<a name="line.122"></a>
-<span class="sourceLineNo">123</span><a name="line.123"></a>
-<span class="sourceLineNo">124</span> /** Name of the operation to use in the controller */<a name="line.124"></a>
-<span class="sourceLineNo">125</span> public static final String ONLINE_SNAPSHOT_CONTROLLER_DESCRIPTION = "online-snapshot";<a name="line.125"></a>
-<span class="sourceLineNo">126</span><a name="line.126"></a>
-<span class="sourceLineNo">127</span> /** Conf key for # of threads used by the SnapshotManager thread pool */<a name="line.127"></a>
-<span class="sourceLineNo">128</span> private static final String SNAPSHOT_POOL_THREADS_KEY = "hbase.snapshot.master.threads";<a name="line.128"></a>
-<span class="sourceLineNo">129</span><a name="line.129"></a>
-<span class="sourceLineNo">130</span> /** number of current operations running on the master */<a name="line.130"></a>
-<span class="sourceLineNo">131</span> private static final int SNAPSHOT_POOL_THREADS_DEFAULT = 1;<a name="line.131"></a>
-<span class="sourceLineNo">132</span><a name="line.132"></a>
-<span class="sourceLineNo">133</span> private boolean stopped;<a name="line.133"></a>
-<span class="sourceLineNo">134</span> private MasterServices master; // Needed by TableEventHandlers<a name="line.134"></a>
-<span class="sourceLineNo">135</span> private ProcedureCoordinator coordinator;<a name="line.135"></a>
-<span class="sourceLineNo">136</span><a name="line.136"></a>
-<span class="sourceLineNo">137</span> // Is snapshot feature enabled?<a name="line.137"></a>
-<span class="sourceLineNo">138</span> private boolean isSnapshotSupported = false;<a name="line.138"></a>
-<span class="sourceLineNo">139</span><a name="line.139"></a>
-<span class="sourceLineNo">140</span> // Snapshot handlers map, with table name as key.<a name="line.140"></a>
-<span class="sourceLineNo">141</span> // The map is always accessed and modified under the object lock using synchronized.<a name="line.141"></a>
-<span class="sourceLineNo">142</span> // snapshotTable() will insert an Handler in the table.<a name="line.142"></a>
-<span class="sourceLineNo">143</span> // isSnapshotDone() will remove the handler requested if the operation is finished.<a name="line.143"></a>
-<span class="sourceLineNo">144</span> private Map<TableName, SnapshotSentinel> snapshotHandlers =<a name="line.144"></a>
-<span class="sourceLineNo">145</span> new HashMap<TableName, SnapshotSentinel>();<a name="line.145"></a>
-<span class="sourceLineNo">146</span><a name="line.146"></a>
-<span class="sourceLineNo">147</span> // Restore Sentinels map, with table name as key.<a name="line.147"></a>
-<span class="sourceLineNo">148</span> // The map is always accessed and modified under the object lock using synchronized.<a name="line.148"></a>
-<span class="sourceLineNo">149</span> // restoreSnapshot()/cloneSnapshot() will insert an Handler in the table.<a name="line.149"></a>
-<span class="sourceLineNo">150</span> // isRestoreDone() will remove the handler requested if the operation is finished.<a name="line.150"></a>
-<span class="sourceLineNo">151</span> private Map<TableName, SnapshotSentinel> restoreHandlers =<a name="line.151"></a>
-<span class="sourceLineNo">152</span> new HashMap<TableName, SnapshotSentinel>();<a name="line.152"></a>
-<span class="sourceLineNo">153</span><a name="line.153"></a>
-<span class="sourceLineNo">154</span> private Path rootDir;<a name="line.154"></a>
-<span class="sourceLineNo">155</span> private ExecutorService executorService;<a name="line.155"></a>
-<span class="sourceLineNo">156</span><a name="line.156"></a>
-<span class="sourceLineNo">157</span> public SnapshotManager() {}<a name="line.157"></a>
-<span class="sourceLineNo">158</span><a name="line.158"></a>
-<span class="sourceLineNo">159</span> /**<a name="line.159"></a>
-<span class="sourceLineNo">160</span> * Fully specify all necessary components of a snapshot manager. Exposed for testing.<a name="line.160"></a>
-<span class="sourceLineNo">161</span> * @param master services for the master where the manager is running<a name="line.161"></a>
-<span class="sourceLineNo">162</span> * @param coordinator procedure coordinator instance. exposed for testing.<a name="line.162"></a>
-<span class="sourceLineNo">163</span> * @param pool HBase ExecutorServcie instance, exposed for testing.<a name="line.163"></a>
-<span class="sourceLineNo">164</span> */<a name="line.164"></a>
-<span class="sourceLineNo">165</span> public SnapshotManager(final MasterServices master, final MetricsMaster metricsMaster,<a name="line.165"></a>
-<span class="sourceLineNo">166</span> ProcedureCoordinator coordinator, ExecutorService pool)<a name="line.166"></a>
-<span class="sourceLineNo">167</span> throws IOException, UnsupportedOperationException {<a name="line.167"></a>
-<span class="sourceLineNo">168</span> this.master = master;<a name="line.168"></a>
-<span class="sourceLineNo">169</span><a name="line.169"></a>
-<span class="sourceLineNo">170</span> this.rootDir = master.getMasterFileSystem().getRootDir();<a name="line.170"></a>
-<span class="sourceLineNo">171</span> checkSnapshotSupport(master.getConfiguration(), master.getMasterFileSystem());<a name="line.171"></a>
-<span class="sourceLineNo">172</span><a name="line.172"></a>
-<span class="sourceLineNo">173</span> this.coordinator = coordinator;<a name="line.173"></a>
-<span class="sourceLineNo">174</span> this.executorService = pool;<a name="line.174"></a>
-<span class="sourceLineNo">175</span> resetTempDir();<a name="line.175"></a>
-<span class="sourceLineNo">176</span> }<a name="line.176"></a>
-<span class="sourceLineNo">177</span><a name="line.177"></a>
-<span class="sourceLineNo">178</span> /**<a name="line.178"></a>
-<span class="sourceLineNo">179</span> * Gets the list of all completed snapshots.<a name="line.179"></a>
-<span class="sourceLineNo">180</span> * @return list of SnapshotDescriptions<a name="line.180"></a>
-<span class="sourceLineNo">181</span> * @throws IOException File system exception<a name="line.181"></a>
-<span class="sourceLineNo">182</span> */<a name="line.182"></a>
-<span class="sourceLineNo">183</span> public List<SnapshotDescription> getCompletedSnapshots() throws IOException {<a name="line.183"></a>
-<span class="sourceLineNo">184</span> return getCompletedSnapshots(SnapshotDescriptionUtils.getSnapshotsDir(rootDir));<a name="line.184"></a>
-<span class="sourceLineNo">185</span> }<a name="line.185"></a>
-<span class="sourceLineNo">186</span><a name="line.186"></a>
-<span class="sourceLineNo">187</span> /**<a name="line.187"></a>
-<span class="sourceLineNo">188</span> * Gets the list of all completed snapshots.<a name="line.188"></a>
-<span class="sourceLineNo">189</span> * @param snapshotDir snapshot directory<a name="line.189"></a>
-<span class="sourceLineNo">190</span> * @return list of SnapshotDescriptions<a name="line.190"></a>
-<span class="sourceLineNo">191</span> * @throws IOException File system exception<a name="line.191"></a>
-<span class="sourceLineNo">192</span> */<a name="line.192"></a>
-<span class="sourceLineNo">193</span> private List<SnapshotDescription> getCompletedSnapshots(Path snapshotDir) throws IOException {<a name="line.193"></a>
-<span class="sourceLineNo">194</span> List<SnapshotDescription> snapshotDescs = new ArrayList<SnapshotDescription>();<a name="line.194"></a>
-<span class="sourceLineNo">195</span> // first create the snapshot root path and check to see if it exists<a name="line.195"></a>
-<span class="sourceLineNo">196</span> FileSystem fs = master.getMasterFileSystem().getFileSystem();<a name="line.196"></a>
-<span class="sourceLineNo">197</span> if (snapshotDir == null) snapshotDir = SnapshotDescriptionUtils.getSnapshotsDir(rootDir);<a name="line.197"></a>
-<span class="sourceLineNo">198</span><a name="line.198"></a>
-<span class="sourceLineNo">199</span> // if there are no snapshots, return an empty list<a name="line.199"></a>
-<span class="sourceLineNo">200</span> if (!fs.exists(snapshotDir)) {<a name="line.200"></a>
-<span class="sourceLineNo">201</span> return snapshotDescs;<a name="line.201"></a>
-<span class="sourceLineNo">202</span> }<a name="line.202"></a>
-<span class="sourceLineNo">203</span><a name="line.203"></a>
-<span class="sourceLineNo">204</span> // ignore all the snapshots in progress<a name="line.204"></a>
-<span class="sourceLineNo">205</span> FileStatus[] snapshots = fs.listStatus(snapshotDir,<a name="line.205"></a>
-<span class="sourceLineNo">206</span> new SnapshotDescriptionUtils.CompletedSnaphotDirectoriesFilter(fs));<a name="line.206"></a>
-<span class="sourceLineNo">207</span> MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();<a name="line.207"></a>
-<span class="sourceLineNo">208</span> // loop through all the completed snapshots<a name="line.208"></a>
-<span class="sourceLineNo">209</span> for (FileStatus snapshot : snapshots) {<a name="line.209"></a>
-<span class="sourceLineNo">210</span> Path info = new Path(snapshot.getPath(), SnapshotDescriptionUtils.SNAPSHOTINFO_FILE);<a name="line.210"></a>
-<span class="sourceLineNo">211</span> // if the snapshot is bad<a name="line.211"></a>
-<span class="sourceLineNo">212</span> if (!fs.exists(info)) {<a name="line.212"></a>
-<span class="sourceLineNo">213</span> LOG.error("Snapshot information for " + snapshot.getPath() + " doesn't exist");<a name="line.213"></a>
-<span class="sourceLineNo">214</span> continue;<a name="line.214"></a>
-<span class="sourceLineNo">215</span> }<a name="line.215"></a>
-<span class="sourceLineNo">216</span> FSDataInputStream in = null;<a name="line.216"></a>
-<span class="sourceLineNo">217</span> try {<a name="line.217"></a>
-<span class="sourceLineNo">218</span> in = fs.open(info);<a name="line.218"></a>
-<span class="sourceLineNo">219</span> SnapshotDescription desc = SnapshotDescription.parseFrom(in);<a name="line.219"></a>
-<span class="sourceLineNo">220</span> if (cpHost != null) {<a name="line.220"></a>
-<span class="sourceLineNo">221</span> try {<a name="line.221"></a>
-<span class="sourceLineNo">222</span> cpHost.preListSnapshot(desc);<a name="line.222"></a>
-<span class="sourceLineNo">223</span> } catch (AccessDeniedException e) {<a name="line.223"></a>
-<span class="sourceLineNo">224</span> LOG.warn("Current user does not have access to " + desc.getName() + " snapshot. "<a name="line.224"></a>
-<span class="sourceLineNo">225</span> + "Either you should be owner of this snapshot or admin user.");<a name="line.225"></a>
-<span class="sourceLineNo">226</span> // Skip this and try for next snapshot<a name="line.226"></a>
-<span class="sourceLineNo">227</span> continue;<a name="line.227"></a>
-<span class="sourceLineNo">228</span> }<a name="line.228"></a>
-<span class="sourceLineNo">229</span> }<a name="line.229"></a>
-<span class="sourceLineNo">230</span> snapshotDescs.add(desc);<a name="line.230"></a>
-<span class="sourceLineNo">231</span><a name="line.231"></a>
-<span class="sourceLineNo">232</span> // call coproc post hook<a name="line.232"></a>
-<span class="sourceLineNo">233</span> if (cpHost != null) {<a name="line.233"></a>
-<span class="sourceLineNo">234</span> cpHost.postListSnapshot(desc);<a name="line.234"></a>
-<span class="sourceLineNo">235</span> }<a name="line.235"></a>
-<span class="sourceLineNo">236</span> } catch (IOException e) {<a name="line.236"></a>
-<span class="sourceLineNo">237</span> LOG.warn("Found a corrupted snapshot " + snapshot.getPath(), e);<a name="line.237"></a>
-<span class="sourceLineNo">238</span> } finally {<a name="line.238"></a>
-<span class="sourceLineNo">239</span> if (in != null) {<a name="line.239"></a>
-<span class="sourceLineNo">240</span> in.close();<a name="line.240"></a>
-<span class="sourceLineNo">241</span> }<a name="line.241"></a>
-<span class="sourceLineNo">242</span> }<a name="line.242"></a>
-<span class="sourceLineNo">243</span> }<a name="line.243"></a>
-<span class="sourceLineNo">244</span> return snapshotDescs;<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> /**<a name="line.247"></a>
-<span class="sourceLineNo">248</span> * Cleans up any snapshots in the snapshot/.tmp directory that were left from failed<a name="line.248"></a>
-<span class="sourceLineNo">249</span> * snapshot attempts.<a name="line.249"></a>
-<span class="sourceLineNo">250</span> *<a name="line.250"></a>
-<span class="sourceLineNo">251</span> * @throws IOException if we can't reach the filesystem<a name="line.251"></a>
-<span class="sourceLineNo">252</span> */<a name="line.252"></a>
-<span class="sourceLineNo">253</span> void resetTempDir() throws IOException {<a name="line.253"></a>
-<span class="sourceLineNo">254</span> // cleanup any existing snapshots.<a name="line.254"></a>
-<span class="sourceLineNo">255</span> Path tmpdir = SnapshotDescriptionUtils.getWorkingSnapshotDir(rootDir);<a name="line.255"></a>
-<span class="sourceLineNo">256</span> if (master.getMasterFileSystem().getFileSystem().exists(tmpdir)) {<a name="line.256"></a>
-<span class="sourceLineNo">257</span> if (!master.getMasterFileSystem().getFileSystem().delete(tmpdir, true)) {<a name="line.257"></a>
-<span class="sourceLineNo">258</span> LOG.warn("Couldn't delete working snapshot directory: " + tmpdir);<a name="line.258"></a>
-<span class="sourceLineNo">259</span> }<a name="line.259"></a>
-<span class="sourceLineNo">260</span> }<a name="line.260"></a>
-<span class="sourceLineNo">261</span> }<a name="line.261"></a>
-<span class="sourceLineNo">262</span><a name="line.262"></a>
-<span class="sourceLineNo">263</span> /**<a name="line.263"></a>
-<span class="sourceLineNo">264</span> * Delete the specified snapshot<a name="line.264"></a>
-<span class="sourceLineNo">265</span> * @param snapshot<a name="line.265"></a>
-<span class="sourceLineNo">266</span> * @throws SnapshotDoesNotExistException If the specified snapshot does not exist.<a name="line.266"></a>
-<span class="sourceLineNo">267</span> * @throws IOException For filesystem IOExceptions<a name="line.267"></a>
-<span class="sourceLineNo">268</span> */<a name="line.268"></a>
-<span class="sourceLineNo">269</span> public void deleteSnapshot(SnapshotDescription snapshot) throws SnapshotDoesNotExistException, IOException {<a name="line.269"></a>
-<span class="sourceLineNo">270</span> // check to see if it is completed<a name="line.270"></a>
-<span class="sourceLineNo">271</span> if (!isSnapshotCompleted(snapshot)) {<a name="line.271"></a>
-<span class="sourceLineNo">272</span> throw new SnapshotDoesNotExistException(snapshot);<a name="line.272"></a>
-<span class="sourceLineNo">273</span> }<a name="line.273"></a>
-<span class="sourceLineNo">274</span><a name="line.274"></a>
-<span class="sourceLineNo">275</span> String snapshotName = snapshot.getName();<a name="line.275"></a>
-<span class="sourceLineNo">276</span> // first create the snapshot description and check to see if it exists<a name="line.276"></a>
-<span class="sourceLineNo">277</span> FileSystem fs = master.getMasterFileSystem().getFileSystem();<a name="line.277"></a>
-<span class="sourceLineNo">278</span> Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshotName, rootDir);<a name="line.278"></a>
-<span class="sourceLineNo">279</span> // Get snapshot info from file system. The one passed as parameter is a "fake" snapshotInfo with<a name="line.279"></a>
-<span class="sourceLineNo">280</span> // just the "name" and it does not contains the "real" snapshot information<a name="line.280"></a>
-<span class="sourceLineNo">281</span> snapshot = SnapshotDescriptionUtils.readSnapshotInfo(fs, snapshotDir);<a name="line.281"></a>
-<span class="sourceLineNo">282</span><a name="line.282"></a>
-<span class="sourceLineNo">283</span> // call coproc pre hook<a name="line.283"></a>
-<span class="sourceLineNo">284</span> MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();<a name="line.284"></a>
-<span class="sourceLineNo">285</span> if (cpHost != null) {<a name="line.285"></a>
-<span class="sourceLineNo">286</span> cpHost.preDeleteSnapshot(snapshot);<a name="line.286"></a>
-<span class="sourceLineNo">287</span> }<a name="line.287"></a>
-<span class="sourceLineNo">288</span><a name="line.288"></a>
-<span class="sourceLineNo">289</span> LOG.debug("Deleting snapshot: " + snapshotName);<a name="line.289"></a>
-<span class="sourceLineNo">290</span> // delete the existing snapshot<a name="line.290"></a>
-<span class="sourceLineNo">291</span> if (!fs.delete(snapshotDir, true)) {<a name="line.291"></a>
-<span class="sourceLineNo">292</span> throw new HBaseSnapshotException("Failed to delete snapshot directory: " + snapshotDir);<a name="line.292"></a>
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-<span class="sourceLineNo">780</span> /**<a name="line.780"></a>
-<span class="sourceLineNo">781</span> * Restore the specified snapshot.<a name="line.781"></a>
-<span class="sourceLineNo">782</span> * The restore will fail if the destination table has a snapshot or restore in progress.<a name="line.782"></a>
-<span class="sourceLineNo">783</span> *<a name="line.783"></a>
-<span class="sourceLineNo">784</span> * @param snapshot Snapshot Descriptor<a name="line.784"></a>
-<span class="sourceLineNo">785</span> * @param hTableDescriptor Table Descriptor<a name="line.785"></a>
-<span class="sourceLineNo">786</span> */<a name="line.786"></a>
-<span class="sourceLineNo">787</span> private synchronized void restoreSnapshot(final SnapshotDescription snapshot,<a name="line.787"></a>
-<span class="sourceLineNo">788</span> final HTableDescriptor hTableDescriptor) throws HBaseSnapshotException {<a name="line.788"></a>
-<span class="sourceLineNo">789</span> TableName tableName = hTableDescriptor.getTableName();<a name="line.789"></a>
-<span class="sourceLineNo">790</span><a name="line.790"></a>
-<span class="sourceLineNo">791</span> // make sure we aren't running a snapshot on the same table<a name="line.791"></a>
-<span class="sourceLineNo">792</span> if (isTakingSnapshot(tableName)) {<a name="line.792"></a>
-<span class="sourceLineNo">793</span> throw new RestoreSnapshotException("Snapshot in progress on the restore table=" + tableName);<a name="line.793"></a>
-<span class="sourceLineNo">794</span> }<a name="line.794"></a>
-<span class="sourceLineNo">795</span><a name="line.795"></a>
-<span class="sourceLineNo">796</span> // make sure we aren't running a restore on the same table<a name="line.796"></a>
-<span class="sourceLineNo">797</span> if (isRestoringTable(tableName)) {<a name="line.797"></a>
-<span class="sourceLineNo">798</span> throw new RestoreSnapshotException("Restore already in progress on the table=" + tableName);<a name="line.798"></a>
+<span class="sourceLineNo">068</span>import org.apache.hadoop.hbase.quotas.QuotaExceededException;<a name="line.68"></a>
+<span class="sourceLineNo">069</span>import org.apache.hadoop.hbase.security.AccessDeniedException;<a name="line.69"></a>
+<span class="sourceLineNo">070</span>import org.apache.hadoop.hbase.security.User;<a name="line.70"></a>
+<span class="sourceLineNo">071</span>import org.apache.hadoop.hbase.snapshot.ClientSnapshotDescriptionUtils;<a name="line.71"></a>
+<span class="sourceLineNo">072</span>import org.apache.hadoop.hbase.snapshot.HBaseSnapshotException;<a name="line.72"></a>
+<span class="sourceLineNo">073</span>import org.apache.hadoop.hbase.snapshot.RestoreSnapshotException;<a name="line.73"></a>
+<span class="sourceLineNo">074</span>import org.apache.hadoop.hbase.snapshot.SnapshotCreationException;<a name="line.74"></a>
+<span class="sourceLineNo">075</span>import org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;<a name="line.75"></a>
+<span class="sourceLineNo">076</span>import org.apache.hadoop.hbase.snapshot.SnapshotDoesNotExistException;<a name="line.76"></a>
+<span class="sourceLineNo">077</span>import org.apache.hadoop.hbase.snapshot.SnapshotExistsException;<a name="line.77"></a>
+<span class="sourceLineNo">078</span>import org.apache.hadoop.hbase.snapshot.SnapshotManifest;<a name="line.78"></a>
+<span class="sourceLineNo">079</span>import org.apache.hadoop.hbase.snapshot.SnapshotReferenceUtil;<a name="line.79"></a>
+<span class="sourceLineNo">080</span>import org.apache.hadoop.hbase.snapshot.TablePartiallyOpenException;<a name="line.80"></a>
+<span class="sourceLineNo">081</span>import org.apache.hadoop.hbase.snapshot.UnknownSnapshotException;<a name="line.81"></a>
+<span class="sourceLineNo">082</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.82"></a>
+<span class="sourceLineNo">083</span>import org.apache.hadoop.hbase.util.FSUtils;<a name="line.83"></a>
+<span class="sourceLineNo">084</span>import org.apache.zookeeper.KeeperException;<a name="line.84"></a>
+<span class="sourceLineNo">085</span><a name="line.85"></a>
+<span class="sourceLineNo">086</span>/**<a name="line.86"></a>
+<span class="sourceLineNo">087</span> * This class manages the procedure of taking and restoring snapshots. There is only one<a name="line.87"></a>
+<span class="sourceLineNo">088</span> * SnapshotManager for the master.<a name="line.88"></a>
+<span class="sourceLineNo">089</span> * <p><a name="line.89"></a>
+<span class="sourceLineNo">090</span> * The class provides methods for monitoring in-progress snapshot actions.<a name="line.90"></a>
+<span class="sourceLineNo">091</span> * <p><a name="line.91"></a>
+<span class="sourceLineNo">092</span> * Note: Currently there can only be one snapshot being taken at a time over the cluster. This is a<a name="line.92"></a>
+<span class="sourceLineNo">093</span> * simplification in the current implementation.<a name="line.93"></a>
+<span class="sourceLineNo">094</span> */<a name="line.94"></a>
+<span class="sourceLineNo">095</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.95"></a>
+<span class="sourceLineNo">096</span>@InterfaceStability.Unstable<a name="line.96"></a>
+<span class="sourceLineNo">097</span>public class SnapshotManager extends MasterProcedureManager implements Stoppable {<a name="line.97"></a>
+<span class="sourceLineNo">098</span> private static final Log LOG = LogFactory.getLog(SnapshotManager.class);<a name="line.98"></a>
+<span class="sourceLineNo">099</span><a name="line.99"></a>
+<span class="sourceLineNo">100</span> /** By default, check to see if the snapshot is complete every WAKE MILLIS (ms) */<a name="line.100"></a>
+<span class="sourceLineNo">101</span> private static final int SNAPSHOT_WAKE_MILLIS_DEFAULT = 500;<a name="line.101"></a>
+<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> * Wait time before removing a finished sentinel from the in-progress map<a name="line.104"></a>
+<span class="sourceLineNo">105</span> *<a name="line.105"></a>
+<span class="sourceLineNo">106</span> * NOTE: This is used as a safety auto cleanup.<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * The snapshot and restore handlers map entries are removed when a user asks if a snapshot or<a name="line.107"></a>
+<span class="sourceLineNo">108</span> * restore is completed. This operation is part of the HBaseAdmin snapshot/restore API flow.<a name="line.108"></a>
+<span class="sourceLineNo">109</span> * In case something fails on the client side and the snapshot/restore state is not reclaimed<a name="line.109"></a>
+<span class="sourceLineNo">110</span> * after a default timeout, the entry is removed from the in-progress map.<a name="line.110"></a>
+<span class="sourceLineNo">111</span> * At this point, if the user asks for the snapshot/restore status, the result will be<a name="line.111"></a>
+<span class="sourceLineNo">112</span> * snapshot done if exists or failed if it doesn't exists.<a name="line.112"></a>
+<span class="sourceLineNo">113</span> */<a name="line.113"></a>
+<span class="sourceLineNo">114</span> private static final int SNAPSHOT_SENTINELS_CLEANUP_TIMEOUT = 60 * 1000;<a name="line.114"></a>
+<span class="sourceLineNo">115</span><a name="line.115"></a>
+<span class="sourceLineNo">116</span> /** Enable or disable snapshot support */<a name="line.116"></a>
+<span class="sourceLineNo">117</span> public static final String HBASE_SNAPSHOT_ENABLED = "hbase.snapshot.enabled";<a name="line.117"></a>
+<span class="sourceLineNo">118</span><a name="line.118"></a>
+<span class="sourceLineNo">119</span> /**<a name="line.119"></a>
+<span class="sourceLineNo">120</span> * Conf key for # of ms elapsed between checks for snapshot errors while waiting for<a name="line.120"></a>
+<span class="sourceLineNo">121</span> * completion.<a name="line.121"></a>
+<span class="sourceLineNo">122</span> */<a name="line.122"></a>
+<span class="sourceLineNo">123</span> private static final String SNAPSHOT_WAKE_MILLIS_KEY = "hbase.snapshot.master.wakeMillis";<a name="line.123"></a>
+<span class="sourceLineNo">124</span><a name="line.124"></a>
+<span class="sourceLineNo">125</span> /** Name of the operation to use in the controller */<a name="line.125"></a>
+<span class="sourceLineNo">126</span> public static final String ONLINE_SNAPSHOT_CONTROLLER_DESCRIPTION = "online-snapshot";<a name="line.126"></a>
+<span class="sourceLineNo">127</span><a name="line.127"></a>
+<span class="sourceLineNo">128</span> /** Conf key for # of threads used by the SnapshotManager thread pool */<a name="line.128"></a>
+<span class="sourceLineNo">129</span> private static final String SNAPSHOT_POOL_THREADS_KEY = "hbase.snapshot.master.threads";<a name="line.129"></a>
+<span class="sourceLineNo">130</span><a name="line.130"></a>
+<span class="sourceLineNo">131</span> /** number of current operations running on the master */<a name="line.131"></a>
+<span class="sourceLineNo">132</span> private static final int SNAPSHOT_POOL_THREADS_DEFAULT = 1;<a name="line.132"></a>
+<span class="sourceLineNo">133</span><a name="line.133"></a>
+<span class="sourceLineNo">134</span> private boolean stopped;<a name="line.134"></a>
+<span class="sourceLineNo">135</span> private MasterServices master; // Needed by TableEventHandlers<a name="line.135"></a>
+<span class="sourceLineNo">136</span> private ProcedureCoordinator coordinator;<a name="line.136"></a>
+<span class="sourceLineNo">137</span><a name="line.137"></a>
+<span class="sourceLineNo">138</span> // Is snapshot feature enabled?<a name="line.138"></a>
+<span class="sourceLineNo">139</span> private boolean isSnapshotSupported = false;<a name="line.139"></a>
+<span class="sourceLineNo">140</span><a name="line.140"></a>
+<span class="sourceLineNo">141</span> // Snapshot handlers map, with table name as key.<a name="line.141"></a>
+<span class="sourceLineNo">142</span> // The map is always accessed and modified under the object lock using synchronized.<a name="line.142"></a>
+<span class="sourceLineNo">143</span> // snapshotTable() will insert an Handler in the table.<a name="line.143"></a>
+<span class="sourceLineNo">144</span> // isSnapshotDone() will remove the handler requested if the operation is finished.<a name="line.144"></a>
+<span class="sourceLineNo">145</span> private Map<TableName, SnapshotSentinel> snapshotHandlers =<a name="line.145"></a>
+<span class="sourceLineNo">146</span> new HashMap<TableName, SnapshotSentinel>();<a name="line.146"></a>
+<span class="sourceLineNo">147</span><a name="line.147"></a>
+<span class="sourceLineNo">148</span> // Restore Sentinels map, with table name as key.<a name="line.148"></a>
+<span class="sourceLineNo">149</span> // The map is always accessed and modified under the object lock using synchronized.<a name="line.149"></a>
+<span class="sourceLineNo">150</span> // restoreSnapshot()/cloneSnapshot() will insert an Handler in the table.<a name="line.150"></a>
+<span class="sourceLineNo">151</span> // isRestoreDone() will remove the handler requested if the operation is finished.<a name="line.151"></a>
+<span class="sourceLineNo">152</span> private Map<TableName, SnapshotSentinel> restoreHandlers =<a name="line.152"></a>
+<span class="sourceLineNo">153</span> new HashMap<TableName, SnapshotSentinel>();<a name="line.153"></a>
+<span class="sourceLineNo">154</span><a name="line.154"></a>
+<span class="sourceLineNo">155</span> private Path rootDir;<a name="line.155"></a>
+<span class="sourceLineNo">156</span> private ExecutorService executorService;<a name="line.156"></a>
+<span class="sourceLineNo">157</span><a name="line.157"></a>
+<span class="sourceLineNo">158</span> public SnapshotManager() {}<a name="line.158"></a>
+<span class="sourceLineNo">159</span><a name="line.159"></a>
+<span class="sourceLineNo">160</span> /**<a name="line.160"></a>
+<span class="sourceLineNo">161</span> * Fully specify all necessary components of a snapshot manager. Exposed for testing.<a name="line.161"></a>
+<span class="sourceLineNo">162</span> * @param master services for the master where the manager is running<a name="line.162"></a>
+<span class="sourceLineNo">163</span> * @param coordinator procedure coordinator instance. exposed for testing.<a name="line.163"></a>
+<span class="sourceLineNo">164</span> * @param pool HBase ExecutorServcie instance, exposed for testing.<a name="line.164"></a>
+<span class="sourceLineNo">165</span> */<a name="line.165"></a>
+<span class="sourceLineNo">166</span> public SnapshotManager(final MasterServices master, final MetricsMaster metricsMaster,<a name="line.166"></a>
+<span class="sourceLineNo">167</span> ProcedureCoordinator coordinator, ExecutorService pool)<a name="line.167"></a>
+<span class="sourceLineNo">168</span> throws IOException, UnsupportedOperationException {<a name="line.168"></a>
+<span class="sourceLineNo">169</span> this.master = master;<a name="line.169"></a>
+<span class="sourceLineNo">170</span><a name="line.170"></a>
+<span class="sourceLineNo">171</span> this.rootDir = master.getMasterFileSystem().getRootDir();<a name="line.171"></a>
+<span class="sourceLineNo">172</span> checkSnapshotSupport(master.getConfiguration(), master.getMasterFileSystem());<a name="line.172"></a>
+<span class="sourceLineNo">173</span><a name="line.173"></a>
+<span class="sourceLineNo">174</span> this.coordinator = coordinator;<a name="line.174"></a>
+<span class="sourceLineNo">175</span> this.executorService = pool;<a name="line.175"></a>
+<span class="sourceLineNo">176</span> resetTempDir();<a name="line.176"></a>
+<span class="sourceLineNo">177</span> }<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> * Gets the list of all completed snapshots.<a name="line.180"></a>
+<span class="sourceLineNo">181</span> * @return list of SnapshotDescriptions<a name="line.181"></a>
+<span class="sourceLineNo">182</span> * @throws IOException File system exception<a name="line.182"></a>
+<span class="sourceLineNo">183</span> */<a name="line.183"></a>
+<span class="sourceLineNo">184</span> public List<SnapshotDescription> getCompletedSnapshots() throws IOException {<a name="line.184"></a>
+<span class="sourceLineNo">185</span> return getCompletedSnapshots(SnapshotDescriptionUtils.getSnapshotsDir(rootDir));<a name="line.185"></a>
+<span class="sourceLineNo">186</span> }<a name="line.186"></a>
+<span class="sourceLineNo">187</span><a name="line.187"></a>
+<span class="sourceLineNo">188</span> /**<a name="line.188"></a>
+<span class="sourceLineNo">189</span> * Gets t
<TRUNCATED>