http://git-wip-us.apache.org/repos/asf/hbase-site/blob/3353a0ac/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/TakeSnapshotHandler.html
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diff --git
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/TakeSnapshotHandler.html
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/TakeSnapshotHandler.html
index 59324bd..02ec363 100644
---
a/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/TakeSnapshotHandler.html
+++
b/devapidocs/src-html/org/apache/hadoop/hbase/master/snapshot/TakeSnapshotHandler.html
@@ -32,352 +32,349 @@
<span class="sourceLineNo">024</span>import java.util.List;<a
name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.Set;<a
name="line.25"></a>
<span class="sourceLineNo">026</span>import
java.util.concurrent.CancellationException;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import
java.util.concurrent.locks.ReentrantLock;<a name="line.27"></a>
-<span class="sourceLineNo">028</span><a name="line.28"></a>
-<span class="sourceLineNo">029</span>import
org.apache.hadoop.conf.Configuration;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.fs.FileSystem;<a
name="line.30"></a>
-<span class="sourceLineNo">031</span>import org.apache.hadoop.fs.FileUtil;<a
name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.hadoop.fs.Path;<a
name="line.32"></a>
-<span class="sourceLineNo">033</span>import
org.apache.hadoop.hbase.MetaTableAccessor;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import
org.apache.hadoop.hbase.ServerName;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import
org.apache.hadoop.hbase.TableName;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import
org.apache.hadoop.hbase.client.RegionInfo;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import
org.apache.hadoop.hbase.client.TableDescriptor;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import
org.apache.hadoop.hbase.errorhandling.ForeignException;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import
org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher;<a
name="line.39"></a>
-<span class="sourceLineNo">040</span>import
org.apache.hadoop.hbase.errorhandling.ForeignExceptionSnare;<a
name="line.40"></a>
-<span class="sourceLineNo">041</span>import
org.apache.hadoop.hbase.executor.EventHandler;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import
org.apache.hadoop.hbase.executor.EventType;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import
org.apache.hadoop.hbase.master.MasterServices;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import
org.apache.hadoop.hbase.master.MetricsSnapshot;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import
org.apache.hadoop.hbase.master.SnapshotSentinel;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import
org.apache.hadoop.hbase.master.locking.LockManager;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import
org.apache.hadoop.hbase.master.locking.LockManager.MasterLock;<a
name="line.47"></a>
-<span class="sourceLineNo">048</span>import
org.apache.hadoop.hbase.monitoring.MonitoredTask;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import
org.apache.hadoop.hbase.monitoring.TaskMonitor;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import
org.apache.hadoop.hbase.procedure2.LockType;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import
org.apache.hadoop.hbase.snapshot.ClientSnapshotDescriptionUtils;<a
name="line.51"></a>
-<span class="sourceLineNo">052</span>import
org.apache.hadoop.hbase.snapshot.SnapshotCreationException;<a
name="line.52"></a>
-<span class="sourceLineNo">053</span>import
org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import
org.apache.hadoop.hbase.snapshot.SnapshotManifest;<a name="line.54"></a>
-<span class="sourceLineNo">055</span>import
org.apache.hadoop.hbase.util.FSUtils;<a name="line.55"></a>
-<span class="sourceLineNo">056</span>import
org.apache.hadoop.hbase.util.Pair;<a name="line.56"></a>
-<span class="sourceLineNo">057</span>import
org.apache.hadoop.hbase.zookeeper.MetaTableLocator;<a name="line.57"></a>
-<span class="sourceLineNo">058</span>import
org.apache.yetus.audience.InterfaceAudience;<a name="line.58"></a>
-<span class="sourceLineNo">059</span>import
org.apache.zookeeper.KeeperException;<a name="line.59"></a>
-<span class="sourceLineNo">060</span>import org.slf4j.Logger;<a
name="line.60"></a>
-<span class="sourceLineNo">061</span>import org.slf4j.LoggerFactory;<a
name="line.61"></a>
-<span class="sourceLineNo">062</span><a name="line.62"></a>
-<span class="sourceLineNo">063</span>import
org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<a
name="line.63"></a>
-<span class="sourceLineNo">064</span>import
org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.SnapshotDescription;<a
name="line.64"></a>
-<span class="sourceLineNo">065</span><a name="line.65"></a>
-<span class="sourceLineNo">066</span>/**<a name="line.66"></a>
-<span class="sourceLineNo">067</span> * A handler for taking snapshots from
the master.<a name="line.67"></a>
-<span class="sourceLineNo">068</span> *<a name="line.68"></a>
-<span class="sourceLineNo">069</span> * This is not a subclass of
TableEventHandler because using that would incur an extra hbase:meta scan.<a
name="line.69"></a>
-<span class="sourceLineNo">070</span> *<a name="line.70"></a>
-<span class="sourceLineNo">071</span> * The {@link #snapshotRegions(List)}
call should get implemented for each snapshot flavor.<a name="line.71"></a>
-<span class="sourceLineNo">072</span> */<a name="line.72"></a>
-<span class="sourceLineNo">073</span>@InterfaceAudience.Private<a
name="line.73"></a>
-<span class="sourceLineNo">074</span>public abstract class TakeSnapshotHandler
extends EventHandler implements SnapshotSentinel,<a name="line.74"></a>
-<span class="sourceLineNo">075</span> ForeignExceptionSnare {<a
name="line.75"></a>
-<span class="sourceLineNo">076</span> private static final Logger LOG =
LoggerFactory.getLogger(TakeSnapshotHandler.class);<a name="line.76"></a>
-<span class="sourceLineNo">077</span><a name="line.77"></a>
-<span class="sourceLineNo">078</span> private volatile boolean finished;<a
name="line.78"></a>
-<span class="sourceLineNo">079</span><a name="line.79"></a>
-<span class="sourceLineNo">080</span> // none of these should ever be null<a
name="line.80"></a>
-<span class="sourceLineNo">081</span> protected final MasterServices
master;<a name="line.81"></a>
-<span class="sourceLineNo">082</span> protected final MetricsSnapshot
metricsSnapshot = new MetricsSnapshot();<a name="line.82"></a>
-<span class="sourceLineNo">083</span> protected final SnapshotDescription
snapshot;<a name="line.83"></a>
-<span class="sourceLineNo">084</span> protected final Configuration conf;<a
name="line.84"></a>
-<span class="sourceLineNo">085</span> protected final FileSystem rootFs;<a
name="line.85"></a>
-<span class="sourceLineNo">086</span> protected final FileSystem
workingDirFs;<a name="line.86"></a>
-<span class="sourceLineNo">087</span> protected final Path rootDir;<a
name="line.87"></a>
-<span class="sourceLineNo">088</span> private final Path snapshotDir;<a
name="line.88"></a>
-<span class="sourceLineNo">089</span> protected final Path workingDir;<a
name="line.89"></a>
-<span class="sourceLineNo">090</span> private final MasterSnapshotVerifier
verifier;<a name="line.90"></a>
-<span class="sourceLineNo">091</span> protected final
ForeignExceptionDispatcher monitor;<a name="line.91"></a>
-<span class="sourceLineNo">092</span> private final LockManager.MasterLock
tableLock;<a name="line.92"></a>
-<span class="sourceLineNo">093</span> protected final MonitoredTask status;<a
name="line.93"></a>
-<span class="sourceLineNo">094</span> protected final TableName
snapshotTable;<a name="line.94"></a>
-<span class="sourceLineNo">095</span> protected final SnapshotManifest
snapshotManifest;<a name="line.95"></a>
-<span class="sourceLineNo">096</span> protected final SnapshotManager
snapshotManager;<a name="line.96"></a>
-<span class="sourceLineNo">097</span><a name="line.97"></a>
-<span class="sourceLineNo">098</span> protected TableDescriptor htd;<a
name="line.98"></a>
-<span class="sourceLineNo">099</span><a name="line.99"></a>
-<span class="sourceLineNo">100</span> /**<a name="line.100"></a>
-<span class="sourceLineNo">101</span> * @param snapshot descriptor of the
snapshot to take<a name="line.101"></a>
-<span class="sourceLineNo">102</span> * @param masterServices master
services provider<a name="line.102"></a>
-<span class="sourceLineNo">103</span> * @throws IllegalArgumentException if
the working snapshot directory set from the<a name="line.103"></a>
-<span class="sourceLineNo">104</span> * configuration is the same as the
completed snapshot directory<a name="line.104"></a>
-<span class="sourceLineNo">105</span> * @throws IOException if the file
system of the working snapshot directory cannot be<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * determined<a name="line.106"></a>
-<span class="sourceLineNo">107</span> */<a name="line.107"></a>
-<span class="sourceLineNo">108</span> public
TakeSnapshotHandler(SnapshotDescription snapshot, final MasterServices
masterServices,<a name="line.108"></a>
-<span class="sourceLineNo">109</span> final
SnapshotManager snapshotManager) throws IOException {<a name="line.109"></a>
-<span class="sourceLineNo">110</span> super(masterServices,
EventType.C_M_SNAPSHOT_TABLE);<a name="line.110"></a>
-<span class="sourceLineNo">111</span> assert snapshot != null :
"SnapshotDescription must not be nul1";<a name="line.111"></a>
-<span class="sourceLineNo">112</span> assert masterServices != null :
"MasterServices must not be nul1";<a name="line.112"></a>
-<span class="sourceLineNo">113</span> this.master = masterServices;<a
name="line.113"></a>
-<span class="sourceLineNo">114</span> this.conf =
this.master.getConfiguration();<a name="line.114"></a>
-<span class="sourceLineNo">115</span> this.rootDir =
this.master.getMasterFileSystem().getRootDir();<a name="line.115"></a>
-<span class="sourceLineNo">116</span> this.workingDir =
SnapshotDescriptionUtils.getWorkingSnapshotDir(snapshot, rootDir, conf);<a
name="line.116"></a>
-<span class="sourceLineNo">117</span>
Preconditions.checkArgument(!SnapshotDescriptionUtils.isSubDirectoryOf(workingDir,
rootDir) ||<a name="line.117"></a>
-<span class="sourceLineNo">118</span>
SnapshotDescriptionUtils.isWithinDefaultWorkingDir(workingDir, conf),<a
name="line.118"></a>
-<span class="sourceLineNo">119</span> "The working directory " +
workingDir + " cannot be in the root directory unless it is "<a
name="line.119"></a>
-<span class="sourceLineNo">120</span> + "within the default working
directory");<a name="line.120"></a>
-<span class="sourceLineNo">121</span><a name="line.121"></a>
-<span class="sourceLineNo">122</span> this.snapshot = snapshot;<a
name="line.122"></a>
-<span class="sourceLineNo">123</span> this.snapshotManager =
snapshotManager;<a name="line.123"></a>
-<span class="sourceLineNo">124</span> this.snapshotTable =
TableName.valueOf(snapshot.getTable());<a name="line.124"></a>
-<span class="sourceLineNo">125</span> this.rootFs =
this.master.getMasterFileSystem().getFileSystem();<a name="line.125"></a>
-<span class="sourceLineNo">126</span> this.snapshotDir =
SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshot, rootDir);<a
name="line.126"></a>
-<span class="sourceLineNo">127</span> this.workingDirFs =
this.workingDir.getFileSystem(this.conf);<a name="line.127"></a>
-<span class="sourceLineNo">128</span> this.monitor = new
ForeignExceptionDispatcher(snapshot.getName());<a name="line.128"></a>
-<span class="sourceLineNo">129</span> this.snapshotManifest =
SnapshotManifest.create(conf, rootFs, workingDir, snapshot, monitor);<a
name="line.129"></a>
-<span class="sourceLineNo">130</span><a name="line.130"></a>
-<span class="sourceLineNo">131</span> this.tableLock =
master.getLockManager().createMasterLock(<a name="line.131"></a>
-<span class="sourceLineNo">132</span> snapshotTable,
LockType.EXCLUSIVE,<a name="line.132"></a>
-<span class="sourceLineNo">133</span> this.getClass().getName() + ":
take snapshot " + snapshot.getName());<a name="line.133"></a>
-<span class="sourceLineNo">134</span><a name="line.134"></a>
-<span class="sourceLineNo">135</span> // prepare the verify<a
name="line.135"></a>
-<span class="sourceLineNo">136</span> this.verifier = new
MasterSnapshotVerifier(masterServices, snapshot, workingDirFs);<a
name="line.136"></a>
-<span class="sourceLineNo">137</span> // update the running tasks<a
name="line.137"></a>
-<span class="sourceLineNo">138</span> this.status =
TaskMonitor.get().createStatus(<a name="line.138"></a>
-<span class="sourceLineNo">139</span> "Taking " + snapshot.getType() + "
snapshot on table: " + snapshotTable);<a name="line.139"></a>
-<span class="sourceLineNo">140</span> }<a name="line.140"></a>
-<span class="sourceLineNo">141</span><a name="line.141"></a>
-<span class="sourceLineNo">142</span> private TableDescriptor
loadTableDescriptor()<a name="line.142"></a>
-<span class="sourceLineNo">143</span> throws FileNotFoundException,
IOException {<a name="line.143"></a>
-<span class="sourceLineNo">144</span> TableDescriptor htd =<a
name="line.144"></a>
-<span class="sourceLineNo">145</span>
this.master.getTableDescriptors().get(snapshotTable);<a name="line.145"></a>
-<span class="sourceLineNo">146</span> if (htd == null) {<a
name="line.146"></a>
-<span class="sourceLineNo">147</span> throw new
IOException("TableDescriptor missing for " + snapshotTable);<a
name="line.147"></a>
-<span class="sourceLineNo">148</span> }<a name="line.148"></a>
-<span class="sourceLineNo">149</span> return htd;<a name="line.149"></a>
-<span class="sourceLineNo">150</span> }<a name="line.150"></a>
-<span class="sourceLineNo">151</span><a name="line.151"></a>
-<span class="sourceLineNo">152</span> @Override<a name="line.152"></a>
-<span class="sourceLineNo">153</span> public TakeSnapshotHandler prepare()
throws Exception {<a name="line.153"></a>
-<span class="sourceLineNo">154</span> super.prepare();<a
name="line.154"></a>
-<span class="sourceLineNo">155</span> // after this, you should ensure to
release this lock in case of exceptions<a name="line.155"></a>
-<span class="sourceLineNo">156</span> this.tableLock.acquire();<a
name="line.156"></a>
-<span class="sourceLineNo">157</span> try {<a name="line.157"></a>
-<span class="sourceLineNo">158</span> this.htd = loadTableDescriptor();
// check that .tableinfo is present<a name="line.158"></a>
-<span class="sourceLineNo">159</span> } catch (Exception e) {<a
name="line.159"></a>
-<span class="sourceLineNo">160</span> this.tableLock.release();<a
name="line.160"></a>
-<span class="sourceLineNo">161</span> throw e;<a name="line.161"></a>
-<span class="sourceLineNo">162</span> }<a name="line.162"></a>
-<span class="sourceLineNo">163</span> return this;<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> /**<a name="line.166"></a>
-<span class="sourceLineNo">167</span> * Execute the core common portions of
taking a snapshot. The {@link #snapshotRegions(List)}<a name="line.167"></a>
-<span class="sourceLineNo">168</span> * call should get implemented for each
snapshot flavor.<a name="line.168"></a>
-<span class="sourceLineNo">169</span> */<a name="line.169"></a>
-<span class="sourceLineNo">170</span> @Override<a name="line.170"></a>
-<span class="sourceLineNo">171</span>
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="REC_CATCH_EXCEPTION",<a
name="line.171"></a>
-<span class="sourceLineNo">172</span> justification="Intentional")<a
name="line.172"></a>
-<span class="sourceLineNo">173</span> public void process() {<a
name="line.173"></a>
-<span class="sourceLineNo">174</span> String msg = "Running " +
snapshot.getType() + " table snapshot " + snapshot.getName() + " "<a
name="line.174"></a>
-<span class="sourceLineNo">175</span> + eventType + " on table " +
snapshotTable;<a name="line.175"></a>
-<span class="sourceLineNo">176</span> LOG.info(msg);<a name="line.176"></a>
-<span class="sourceLineNo">177</span> ReentrantLock lock =
snapshotManager.getLocks().acquireLock(snapshot.getName());<a
name="line.177"></a>
-<span class="sourceLineNo">178</span> MasterLock tableLockToRelease =
this.tableLock;<a name="line.178"></a>
-<span class="sourceLineNo">179</span> status.setStatus(msg);<a
name="line.179"></a>
-<span class="sourceLineNo">180</span> try {<a name="line.180"></a>
-<span class="sourceLineNo">181</span> if (downgradeToSharedTableLock())
{<a name="line.181"></a>
-<span class="sourceLineNo">182</span> // release the exclusive lock and
hold the shared lock instead<a name="line.182"></a>
-<span class="sourceLineNo">183</span> tableLockToRelease =
master.getLockManager().createMasterLock(snapshotTable,<a name="line.183"></a>
-<span class="sourceLineNo">184</span> LockType.SHARED,
this.getClass().getName() + ": take snapshot " + snapshot.getName());<a
name="line.184"></a>
-<span class="sourceLineNo">185</span> tableLock.release();<a
name="line.185"></a>
-<span class="sourceLineNo">186</span> tableLockToRelease.acquire();<a
name="line.186"></a>
-<span class="sourceLineNo">187</span> }<a name="line.187"></a>
-<span class="sourceLineNo">188</span> // If regions move after this meta
scan, the region specific snapshot should fail, triggering<a
name="line.188"></a>
-<span class="sourceLineNo">189</span> // an external exception that gets
captured here.<a name="line.189"></a>
-<span class="sourceLineNo">190</span><a name="line.190"></a>
-<span class="sourceLineNo">191</span> // write down the snapshot info in
the working directory<a name="line.191"></a>
-<span class="sourceLineNo">192</span>
SnapshotDescriptionUtils.writeSnapshotInfo(snapshot, workingDir,
workingDirFs);<a name="line.192"></a>
-<span class="sourceLineNo">193</span>
snapshotManifest.addTableDescriptor(this.htd);<a name="line.193"></a>
-<span class="sourceLineNo">194</span> monitor.rethrowException();<a
name="line.194"></a>
-<span class="sourceLineNo">195</span><a name="line.195"></a>
-<span class="sourceLineNo">196</span> List<Pair<RegionInfo,
ServerName>> regionsAndLocations;<a name="line.196"></a>
-<span class="sourceLineNo">197</span> if
(TableName.META_TABLE_NAME.equals(snapshotTable)) {<a name="line.197"></a>
-<span class="sourceLineNo">198</span> regionsAndLocations = new
MetaTableLocator().getMetaRegionsAndLocations(<a name="line.198"></a>
-<span class="sourceLineNo">199</span> server.getZooKeeper());<a
name="line.199"></a>
-<span class="sourceLineNo">200</span> } else {<a name="line.200"></a>
-<span class="sourceLineNo">201</span> regionsAndLocations =
MetaTableAccessor.getTableRegionsAndLocations(<a name="line.201"></a>
-<span class="sourceLineNo">202</span> server.getConnection(),
snapshotTable, false);<a name="line.202"></a>
-<span class="sourceLineNo">203</span> }<a name="line.203"></a>
-<span class="sourceLineNo">204</span><a name="line.204"></a>
-<span class="sourceLineNo">205</span> // run the snapshot<a
name="line.205"></a>
-<span class="sourceLineNo">206</span>
snapshotRegions(regionsAndLocations);<a name="line.206"></a>
-<span class="sourceLineNo">207</span> monitor.rethrowException();<a
name="line.207"></a>
-<span class="sourceLineNo">208</span><a name="line.208"></a>
-<span class="sourceLineNo">209</span> // extract each pair to separate
lists<a name="line.209"></a>
-<span class="sourceLineNo">210</span> Set<String> serverNames = new
HashSet<>();<a name="line.210"></a>
-<span class="sourceLineNo">211</span> for (Pair<RegionInfo,
ServerName> p : regionsAndLocations) {<a name="line.211"></a>
-<span class="sourceLineNo">212</span> if (p != null &&
p.getFirst() != null && p.getSecond() != null) {<a name="line.212"></a>
-<span class="sourceLineNo">213</span> RegionInfo hri =
p.getFirst();<a name="line.213"></a>
-<span class="sourceLineNo">214</span> if (hri.isOffline() &&
(hri.isSplit() || hri.isSplitParent())) continue;<a name="line.214"></a>
-<span class="sourceLineNo">215</span>
serverNames.add(p.getSecond().toString());<a name="line.215"></a>
-<span class="sourceLineNo">216</span> }<a name="line.216"></a>
-<span class="sourceLineNo">217</span> }<a name="line.217"></a>
-<span class="sourceLineNo">218</span><a name="line.218"></a>
-<span class="sourceLineNo">219</span> // flush the in-memory state, and
write the single manifest<a name="line.219"></a>
-<span class="sourceLineNo">220</span> status.setStatus("Consolidate
snapshot: " + snapshot.getName());<a name="line.220"></a>
-<span class="sourceLineNo">221</span> snapshotManifest.consolidate();<a
name="line.221"></a>
-<span class="sourceLineNo">222</span><a name="line.222"></a>
-<span class="sourceLineNo">223</span> // verify the snapshot is valid<a
name="line.223"></a>
-<span class="sourceLineNo">224</span> status.setStatus("Verifying
snapshot: " + snapshot.getName());<a name="line.224"></a>
-<span class="sourceLineNo">225</span>
verifier.verifySnapshot(this.workingDir, serverNames);<a name="line.225"></a>
-<span class="sourceLineNo">226</span><a name="line.226"></a>
-<span class="sourceLineNo">227</span> // complete the snapshot,
atomically moving from tmp to .snapshot dir.<a name="line.227"></a>
-<span class="sourceLineNo">228</span> completeSnapshot(this.snapshotDir,
this.workingDir, this.rootFs, this.workingDirFs);<a name="line.228"></a>
-<span class="sourceLineNo">229</span> msg = "Snapshot " +
snapshot.getName() + " of table " + snapshotTable + " completed";<a
name="line.229"></a>
-<span class="sourceLineNo">230</span> status.markComplete(msg);<a
name="line.230"></a>
-<span class="sourceLineNo">231</span> LOG.info(msg);<a
name="line.231"></a>
-<span class="sourceLineNo">232</span>
metricsSnapshot.addSnapshot(status.getCompletionTimestamp() -
status.getStartTime());<a name="line.232"></a>
-<span class="sourceLineNo">233</span> } catch (Exception e) { // FindBugs:
REC_CATCH_EXCEPTION<a name="line.233"></a>
-<span class="sourceLineNo">234</span> status.abort("Failed to complete
snapshot " + snapshot.getName() + " on table " +<a name="line.234"></a>
-<span class="sourceLineNo">235</span> snapshotTable + " because " +
e.getMessage());<a name="line.235"></a>
-<span class="sourceLineNo">236</span> String reason = "Failed taking
snapshot " + ClientSnapshotDescriptionUtils.toString(snapshot)<a
name="line.236"></a>
-<span class="sourceLineNo">237</span> + " due to exception:" +
e.getMessage();<a name="line.237"></a>
-<span class="sourceLineNo">238</span> LOG.error(reason, e);<a
name="line.238"></a>
-<span class="sourceLineNo">239</span> ForeignException ee = new
ForeignException(reason, e);<a name="line.239"></a>
-<span class="sourceLineNo">240</span> monitor.receive(ee);<a
name="line.240"></a>
-<span class="sourceLineNo">241</span> // need to mark this completed to
close off and allow cleanup to happen.<a name="line.241"></a>
-<span class="sourceLineNo">242</span> cancel(reason);<a
name="line.242"></a>
-<span class="sourceLineNo">243</span> } finally {<a name="line.243"></a>
-<span class="sourceLineNo">244</span> LOG.debug("Launching cleanup of
working dir:" + workingDir);<a name="line.244"></a>
-<span class="sourceLineNo">245</span> try {<a name="line.245"></a>
-<span class="sourceLineNo">246</span> // if the working dir is still
present, the snapshot has failed. it is present we delete<a
name="line.246"></a>
-<span class="sourceLineNo">247</span> // it.<a name="line.247"></a>
-<span class="sourceLineNo">248</span> if
(!workingDirFs.delete(workingDir, true)) {<a name="line.248"></a>
-<span class="sourceLineNo">249</span> LOG.error("Couldn't delete
snapshot working directory:" + workingDir);<a name="line.249"></a>
-<span class="sourceLineNo">250</span> }<a name="line.250"></a>
-<span class="sourceLineNo">251</span> } catch (IOException e) {<a
name="line.251"></a>
-<span class="sourceLineNo">252</span> LOG.error("Couldn't delete
snapshot working directory:" + workingDir);<a name="line.252"></a>
-<span class="sourceLineNo">253</span> }<a name="line.253"></a>
-<span class="sourceLineNo">254</span> lock.unlock();<a
name="line.254"></a>
-<span class="sourceLineNo">255</span> tableLockToRelease.release();<a
name="line.255"></a>
-<span class="sourceLineNo">256</span> }<a name="line.256"></a>
-<span class="sourceLineNo">257</span> }<a name="line.257"></a>
-<span class="sourceLineNo">258</span><a name="line.258"></a>
-<span class="sourceLineNo">259</span> /**<a name="line.259"></a>
-<span class="sourceLineNo">260</span> * Reset the manager to allow another
snapshot to proceed.<a name="line.260"></a>
-<span class="sourceLineNo">261</span> * Commits the snapshot process by
moving the working snapshot<a name="line.261"></a>
-<span class="sourceLineNo">262</span> * to the finalized filepath<a
name="line.262"></a>
-<span class="sourceLineNo">263</span> *<a name="line.263"></a>
-<span class="sourceLineNo">264</span> * @param snapshotDir The file path of
the completed snapshots<a name="line.264"></a>
-<span class="sourceLineNo">265</span> * @param workingDir The file path of
the in progress snapshots<a name="line.265"></a>
-<span class="sourceLineNo">266</span> * @param fs The file system of the
completed snapshots<a name="line.266"></a>
-<span class="sourceLineNo">267</span> * @param workingDirFs The file system
of the in progress snapshots<a name="line.267"></a>
-<span class="sourceLineNo">268</span> *<a name="line.268"></a>
-<span class="sourceLineNo">269</span> * @throws SnapshotCreationException if
the snapshot could not be moved<a name="line.269"></a>
-<span class="sourceLineNo">270</span> * @throws IOException the filesystem
could not be reached<a name="line.270"></a>
-<span class="sourceLineNo">271</span> */<a name="line.271"></a>
-<span class="sourceLineNo">272</span> public void completeSnapshot(Path
snapshotDir, Path workingDir, FileSystem fs,<a name="line.272"></a>
-<span class="sourceLineNo">273</span> FileSystem workingDirFs) throws
SnapshotCreationException, IOException {<a name="line.273"></a>
-<span class="sourceLineNo">274</span> LOG.debug("Sentinel is done, just
moving the snapshot from " + workingDir + " to "<a name="line.274"></a>
-<span class="sourceLineNo">275</span> + snapshotDir);<a
name="line.275"></a>
-<span class="sourceLineNo">276</span> // If the working and completed
snapshot directory are on the same file system, attempt<a name="line.276"></a>
-<span class="sourceLineNo">277</span> // to rename the working snapshot
directory to the completed location. If that fails,<a name="line.277"></a>
-<span class="sourceLineNo">278</span> // or the file systems differ,
attempt to copy the directory over, throwing an exception<a name="line.278"></a>
-<span class="sourceLineNo">279</span> // if this fails<a
name="line.279"></a>
-<span class="sourceLineNo">280</span> URI workingURI =
workingDirFs.getUri();<a name="line.280"></a>
-<span class="sourceLineNo">281</span> URI rootURI = fs.getUri();<a
name="line.281"></a>
-<span class="sourceLineNo">282</span> if
((!workingURI.getScheme().equals(rootURI.getScheme()) ||<a name="line.282"></a>
-<span class="sourceLineNo">283</span>
!workingURI.getAuthority().equals(rootURI.getAuthority()) ||<a
name="line.283"></a>
-<span class="sourceLineNo">284</span> workingURI.getUserInfo() == null
||<a name="line.284"></a>
-<span class="sourceLineNo">285</span>
!workingURI.getUserInfo().equals(rootURI.getUserInfo()) ||<a
name="line.285"></a>
-<span class="sourceLineNo">286</span> !fs.rename(workingDir,
snapshotDir)) && !FileUtil.copy(workingDirFs, workingDir, fs,<a
name="line.286"></a>
-<span class="sourceLineNo">287</span> snapshotDir, true, true,
this.conf)) {<a name="line.287"></a>
-<span class="sourceLineNo">288</span> throw new
SnapshotCreationException("Failed to copy working directory(" + workingDir<a
name="line.288"></a>
-<span class="sourceLineNo">289</span> + ") to completed directory(" +
snapshotDir + ").");<a name="line.289"></a>
-<span class="sourceLineNo">290</span> }<a name="line.290"></a>
-<span class="sourceLineNo">291</span> finished = true;<a
name="line.291"></a>
-<span class="sourceLineNo">292</span> }<a name="line.292"></a>
-<span class="sourceLineNo">293</span><a name="line.293"></a>
-<span class="sourceLineNo">294</span> /**<a name="line.294"></a>
-<span class="sourceLineNo">295</span> * When taking snapshot, first we must
acquire the exclusive table lock to confirm that there are<a
name="line.295"></a>
-<span class="sourceLineNo">296</span> * no ongoing merge/split procedures.
But later, we should try our best to release the exclusive<a
name="line.296"></a>
-<span class="sourceLineNo">297</span> * lock as this may hurt the
availability, because we need to hold the shared lock when assigning<a
name="line.297"></a>
-<span class="sourceLineNo">298</span> * regions.<a name="line.298"></a>
-<span class="sourceLineNo">299</span> * <p/><a name="line.299"></a>
-<span class="sourceLineNo">300</span> * See HBASE-21480 for more details.<a
name="line.300"></a>
-<span class="sourceLineNo">301</span> */<a name="line.301"></a>
-<span class="sourceLineNo">302</span> protected abstract boolean
downgradeToSharedTableLock();<a name="line.302"></a>
-<span class="sourceLineNo">303</span><a name="line.303"></a>
-<span class="sourceLineNo">304</span> /**<a name="line.304"></a>
-<span class="sourceLineNo">305</span> * Snapshot the specified regions<a
name="line.305"></a>
-<span class="sourceLineNo">306</span> */<a name="line.306"></a>
-<span class="sourceLineNo">307</span> protected abstract void
snapshotRegions(List<Pair<RegionInfo, ServerName>> regions)<a
name="line.307"></a>
-<span class="sourceLineNo">308</span> throws IOException,
KeeperException;<a name="line.308"></a>
-<span class="sourceLineNo">309</span><a name="line.309"></a>
-<span class="sourceLineNo">310</span> /**<a name="line.310"></a>
-<span class="sourceLineNo">311</span> * Take a snapshot of the specified
disabled region<a name="line.311"></a>
-<span class="sourceLineNo">312</span> */<a name="line.312"></a>
-<span class="sourceLineNo">313</span> protected void
snapshotDisabledRegion(final RegionInfo regionInfo)<a name="line.313"></a>
-<span class="sourceLineNo">314</span> throws IOException {<a
name="line.314"></a>
-<span class="sourceLineNo">315</span>
snapshotManifest.addRegion(FSUtils.getTableDir(rootDir, snapshotTable),
regionInfo);<a name="line.315"></a>
-<span class="sourceLineNo">316</span> monitor.rethrowException();<a
name="line.316"></a>
-<span class="sourceLineNo">317</span> status.setStatus("Completed
referencing HFiles for offline region " + regionInfo.toString() +<a
name="line.317"></a>
-<span class="sourceLineNo">318</span> " of table: " + snapshotTable);<a
name="line.318"></a>
-<span class="sourceLineNo">319</span> }<a name="line.319"></a>
-<span class="sourceLineNo">320</span><a name="line.320"></a>
-<span class="sourceLineNo">321</span> @Override<a name="line.321"></a>
-<span class="sourceLineNo">322</span> public void cancel(String why) {<a
name="line.322"></a>
-<span class="sourceLineNo">323</span> if (finished) return;<a
name="line.323"></a>
-<span class="sourceLineNo">324</span><a name="line.324"></a>
-<span class="sourceLineNo">325</span> this.finished = true;<a
name="line.325"></a>
-<span class="sourceLineNo">326</span> LOG.info("Stop taking snapshot=" +
ClientSnapshotDescriptionUtils.toString(snapshot) +<a name="line.326"></a>
-<span class="sourceLineNo">327</span> " because: " + why);<a
name="line.327"></a>
-<span class="sourceLineNo">328</span> CancellationException ce = new
CancellationException(why);<a name="line.328"></a>
-<span class="sourceLineNo">329</span> monitor.receive(new
ForeignException(master.getServerName().toString(), ce));<a name="line.329"></a>
-<span class="sourceLineNo">330</span> }<a name="line.330"></a>
-<span class="sourceLineNo">331</span><a name="line.331"></a>
-<span class="sourceLineNo">332</span> @Override<a name="line.332"></a>
-<span class="sourceLineNo">333</span> public boolean isFinished() {<a
name="line.333"></a>
-<span class="sourceLineNo">334</span> return finished;<a
name="line.334"></a>
-<span class="sourceLineNo">335</span> }<a name="line.335"></a>
-<span class="sourceLineNo">336</span><a name="line.336"></a>
-<span class="sourceLineNo">337</span> @Override<a name="line.337"></a>
-<span class="sourceLineNo">338</span> public long getCompletionTimestamp()
{<a name="line.338"></a>
-<span class="sourceLineNo">339</span> return
this.status.getCompletionTimestamp();<a name="line.339"></a>
-<span class="sourceLineNo">340</span> }<a name="line.340"></a>
-<span class="sourceLineNo">341</span><a name="line.341"></a>
-<span class="sourceLineNo">342</span> @Override<a name="line.342"></a>
-<span class="sourceLineNo">343</span> public SnapshotDescription
getSnapshot() {<a name="line.343"></a>
-<span class="sourceLineNo">344</span> return snapshot;<a
name="line.344"></a>
-<span class="sourceLineNo">345</span> }<a name="line.345"></a>
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-<span class="sourceLineNo">347</span> @Override<a name="line.347"></a>
-<span class="sourceLineNo">348</span> public ForeignException
getExceptionIfFailed() {<a name="line.348"></a>
-<span class="sourceLineNo">349</span> return monitor.getException();<a
name="line.349"></a>
-<span class="sourceLineNo">350</span> }<a name="line.350"></a>
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-<span class="sourceLineNo">352</span> @Override<a name="line.352"></a>
-<span class="sourceLineNo">353</span> public void rethrowExceptionIfFailed()
throws ForeignException {<a name="line.353"></a>
-<span class="sourceLineNo">354</span> monitor.rethrowException();<a
name="line.354"></a>
-<span class="sourceLineNo">355</span> }<a name="line.355"></a>
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-<span class="sourceLineNo">357</span> @Override<a name="line.357"></a>
-<span class="sourceLineNo">358</span> public void rethrowException() throws
ForeignException {<a name="line.358"></a>
-<span class="sourceLineNo">359</span> monitor.rethrowException();<a
name="line.359"></a>
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-<span class="sourceLineNo">362</span> @Override<a name="line.362"></a>
-<span class="sourceLineNo">363</span> public boolean hasException() {<a
name="line.363"></a>
-<span class="sourceLineNo">364</span> return monitor.hasException();<a
name="line.364"></a>
-<span class="sourceLineNo">365</span> }<a name="line.365"></a>
-<span class="sourceLineNo">366</span><a name="line.366"></a>
-<span class="sourceLineNo">367</span> @Override<a name="line.367"></a>
-<span class="sourceLineNo">368</span> public ForeignException getException()
{<a name="line.368"></a>
-<span class="sourceLineNo">369</span> return monitor.getException();<a
name="line.369"></a>
-<span class="sourceLineNo">370</span> }<a name="line.370"></a>
-<span class="sourceLineNo">371</span><a name="line.371"></a>
-<span class="sourceLineNo">372</span>}<a name="line.372"></a>
+<span class="sourceLineNo">027</span><a name="line.27"></a>
+<span class="sourceLineNo">028</span>import
org.apache.hadoop.conf.Configuration;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import org.apache.hadoop.fs.FileSystem;<a
name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.apache.hadoop.fs.FileUtil;<a
name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.apache.hadoop.fs.Path;<a
name="line.31"></a>
+<span class="sourceLineNo">032</span>import
org.apache.hadoop.hbase.MetaTableAccessor;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import
org.apache.hadoop.hbase.ServerName;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import
org.apache.hadoop.hbase.TableName;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import
org.apache.hadoop.hbase.client.RegionInfo;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import
org.apache.hadoop.hbase.client.TableDescriptor;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import
org.apache.hadoop.hbase.errorhandling.ForeignException;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import
org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher;<a
name="line.38"></a>
+<span class="sourceLineNo">039</span>import
org.apache.hadoop.hbase.errorhandling.ForeignExceptionSnare;<a
name="line.39"></a>
+<span class="sourceLineNo">040</span>import
org.apache.hadoop.hbase.executor.EventHandler;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import
org.apache.hadoop.hbase.executor.EventType;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import
org.apache.hadoop.hbase.master.MasterServices;<a name="line.42"></a>
+<span class="sourceLineNo">043</span>import
org.apache.hadoop.hbase.master.MetricsSnapshot;<a name="line.43"></a>
+<span class="sourceLineNo">044</span>import
org.apache.hadoop.hbase.master.SnapshotSentinel;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import
org.apache.hadoop.hbase.master.locking.LockManager;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import
org.apache.hadoop.hbase.master.locking.LockManager.MasterLock;<a
name="line.46"></a>
+<span class="sourceLineNo">047</span>import
org.apache.hadoop.hbase.monitoring.MonitoredTask;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import
org.apache.hadoop.hbase.monitoring.TaskMonitor;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import
org.apache.hadoop.hbase.procedure2.LockType;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import
org.apache.hadoop.hbase.snapshot.ClientSnapshotDescriptionUtils;<a
name="line.50"></a>
+<span class="sourceLineNo">051</span>import
org.apache.hadoop.hbase.snapshot.SnapshotCreationException;<a
name="line.51"></a>
+<span class="sourceLineNo">052</span>import
org.apache.hadoop.hbase.snapshot.SnapshotDescriptionUtils;<a name="line.52"></a>
+<span class="sourceLineNo">053</span>import
org.apache.hadoop.hbase.snapshot.SnapshotManifest;<a name="line.53"></a>
+<span class="sourceLineNo">054</span>import
org.apache.hadoop.hbase.util.FSUtils;<a name="line.54"></a>
+<span class="sourceLineNo">055</span>import
org.apache.hadoop.hbase.util.Pair;<a name="line.55"></a>
+<span class="sourceLineNo">056</span>import
org.apache.hadoop.hbase.zookeeper.MetaTableLocator;<a name="line.56"></a>
+<span class="sourceLineNo">057</span>import
org.apache.yetus.audience.InterfaceAudience;<a name="line.57"></a>
+<span class="sourceLineNo">058</span>import
org.apache.zookeeper.KeeperException;<a name="line.58"></a>
+<span class="sourceLineNo">059</span>import org.slf4j.Logger;<a
name="line.59"></a>
+<span class="sourceLineNo">060</span>import org.slf4j.LoggerFactory;<a
name="line.60"></a>
+<span class="sourceLineNo">061</span><a name="line.61"></a>
+<span class="sourceLineNo">062</span>import
org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<a
name="line.62"></a>
+<span class="sourceLineNo">063</span>import
org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.SnapshotDescription;<a
name="line.63"></a>
+<span class="sourceLineNo">064</span><a name="line.64"></a>
+<span class="sourceLineNo">065</span>/**<a name="line.65"></a>
+<span class="sourceLineNo">066</span> * A handler for taking snapshots from
the master.<a name="line.66"></a>
+<span class="sourceLineNo">067</span> *<a name="line.67"></a>
+<span class="sourceLineNo">068</span> * This is not a subclass of
TableEventHandler because using that would incur an extra hbase:meta scan.<a
name="line.68"></a>
+<span class="sourceLineNo">069</span> *<a name="line.69"></a>
+<span class="sourceLineNo">070</span> * The {@link #snapshotRegions(List)}
call should get implemented for each snapshot flavor.<a name="line.70"></a>
+<span class="sourceLineNo">071</span> */<a name="line.71"></a>
+<span class="sourceLineNo">072</span>@InterfaceAudience.Private<a
name="line.72"></a>
+<span class="sourceLineNo">073</span>public abstract class TakeSnapshotHandler
extends EventHandler implements SnapshotSentinel,<a name="line.73"></a>
+<span class="sourceLineNo">074</span> ForeignExceptionSnare {<a
name="line.74"></a>
+<span class="sourceLineNo">075</span> private static final Logger LOG =
LoggerFactory.getLogger(TakeSnapshotHandler.class);<a name="line.75"></a>
+<span class="sourceLineNo">076</span><a name="line.76"></a>
+<span class="sourceLineNo">077</span> private volatile boolean finished;<a
name="line.77"></a>
+<span class="sourceLineNo">078</span><a name="line.78"></a>
+<span class="sourceLineNo">079</span> // none of these should ever be null<a
name="line.79"></a>
+<span class="sourceLineNo">080</span> protected final MasterServices
master;<a name="line.80"></a>
+<span class="sourceLineNo">081</span> protected final MetricsSnapshot
metricsSnapshot = new MetricsSnapshot();<a name="line.81"></a>
+<span class="sourceLineNo">082</span> protected final SnapshotDescription
snapshot;<a name="line.82"></a>
+<span class="sourceLineNo">083</span> protected final Configuration conf;<a
name="line.83"></a>
+<span class="sourceLineNo">084</span> protected final FileSystem rootFs;<a
name="line.84"></a>
+<span class="sourceLineNo">085</span> protected final FileSystem
workingDirFs;<a name="line.85"></a>
+<span class="sourceLineNo">086</span> protected final Path rootDir;<a
name="line.86"></a>
+<span class="sourceLineNo">087</span> private final Path snapshotDir;<a
name="line.87"></a>
+<span class="sourceLineNo">088</span> protected final Path workingDir;<a
name="line.88"></a>
+<span class="sourceLineNo">089</span> private final MasterSnapshotVerifier
verifier;<a name="line.89"></a>
+<span class="sourceLineNo">090</span> protected final
ForeignExceptionDispatcher monitor;<a name="line.90"></a>
+<span class="sourceLineNo">091</span> private final LockManager.MasterLock
tableLock;<a name="line.91"></a>
+<span class="sourceLineNo">092</span> protected final MonitoredTask status;<a
name="line.92"></a>
+<span class="sourceLineNo">093</span> protected final TableName
snapshotTable;<a name="line.93"></a>
+<span class="sourceLineNo">094</span> protected final SnapshotManifest
snapshotManifest;<a name="line.94"></a>
+<span class="sourceLineNo">095</span> protected final SnapshotManager
snapshotManager;<a name="line.95"></a>
+<span class="sourceLineNo">096</span><a name="line.96"></a>
+<span class="sourceLineNo">097</span> protected TableDescriptor htd;<a
name="line.97"></a>
+<span class="sourceLineNo">098</span><a name="line.98"></a>
+<span class="sourceLineNo">099</span> /**<a name="line.99"></a>
+<span class="sourceLineNo">100</span> * @param snapshot descriptor of the
snapshot to take<a name="line.100"></a>
+<span class="sourceLineNo">101</span> * @param masterServices master
services provider<a name="line.101"></a>
+<span class="sourceLineNo">102</span> * @throws IllegalArgumentException if
the working snapshot directory set from the<a name="line.102"></a>
+<span class="sourceLineNo">103</span> * configuration is the same as the
completed snapshot directory<a name="line.103"></a>
+<span class="sourceLineNo">104</span> * @throws IOException if the file
system of the working snapshot directory cannot be<a name="line.104"></a>
+<span class="sourceLineNo">105</span> * determined<a name="line.105"></a>
+<span class="sourceLineNo">106</span> */<a name="line.106"></a>
+<span class="sourceLineNo">107</span> public
TakeSnapshotHandler(SnapshotDescription snapshot, final MasterServices
masterServices,<a name="line.107"></a>
+<span class="sourceLineNo">108</span> final
SnapshotManager snapshotManager) throws IOException {<a name="line.108"></a>
+<span class="sourceLineNo">109</span> super(masterServices,
EventType.C_M_SNAPSHOT_TABLE);<a name="line.109"></a>
+<span class="sourceLineNo">110</span> assert snapshot != null :
"SnapshotDescription must not be nul1";<a name="line.110"></a>
+<span class="sourceLineNo">111</span> assert masterServices != null :
"MasterServices must not be nul1";<a name="line.111"></a>
+<span class="sourceLineNo">112</span> this.master = masterServices;<a
name="line.112"></a>
+<span class="sourceLineNo">113</span> this.conf =
this.master.getConfiguration();<a name="line.113"></a>
+<span class="sourceLineNo">114</span> this.rootDir =
this.master.getMasterFileSystem().getRootDir();<a name="line.114"></a>
+<span class="sourceLineNo">115</span> this.workingDir =
SnapshotDescriptionUtils.getWorkingSnapshotDir(snapshot, rootDir, conf);<a
name="line.115"></a>
+<span class="sourceLineNo">116</span>
Preconditions.checkArgument(!SnapshotDescriptionUtils.isSubDirectoryOf(workingDir,
rootDir) ||<a name="line.116"></a>
+<span class="sourceLineNo">117</span>
SnapshotDescriptionUtils.isWithinDefaultWorkingDir(workingDir, conf),<a
name="line.117"></a>
+<span class="sourceLineNo">118</span> "The working directory " +
workingDir + " cannot be in the root directory unless it is "<a
name="line.118"></a>
+<span class="sourceLineNo">119</span> + "within the default working
directory");<a name="line.119"></a>
+<span class="sourceLineNo">120</span><a name="line.120"></a>
+<span class="sourceLineNo">121</span> this.snapshot = snapshot;<a
name="line.121"></a>
+<span class="sourceLineNo">122</span> this.snapshotManager =
snapshotManager;<a name="line.122"></a>
+<span class="sourceLineNo">123</span> this.snapshotTable =
TableName.valueOf(snapshot.getTable());<a name="line.123"></a>
+<span class="sourceLineNo">124</span> this.rootFs =
this.master.getMasterFileSystem().getFileSystem();<a name="line.124"></a>
+<span class="sourceLineNo">125</span> this.snapshotDir =
SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshot, rootDir);<a
name="line.125"></a>
+<span class="sourceLineNo">126</span> this.workingDirFs =
this.workingDir.getFileSystem(this.conf);<a name="line.126"></a>
+<span class="sourceLineNo">127</span> this.monitor = new
ForeignExceptionDispatcher(snapshot.getName());<a name="line.127"></a>
+<span class="sourceLineNo">128</span> this.snapshotManifest =
SnapshotManifest.create(conf, rootFs, workingDir, snapshot, monitor);<a
name="line.128"></a>
+<span class="sourceLineNo">129</span><a name="line.129"></a>
+<span class="sourceLineNo">130</span> this.tableLock =
master.getLockManager().createMasterLock(<a name="line.130"></a>
+<span class="sourceLineNo">131</span> snapshotTable,
LockType.EXCLUSIVE,<a name="line.131"></a>
+<span class="sourceLineNo">132</span> this.getClass().getName() + ":
take snapshot " + snapshot.getName());<a name="line.132"></a>
+<span class="sourceLineNo">133</span><a name="line.133"></a>
+<span class="sourceLineNo">134</span> // prepare the verify<a
name="line.134"></a>
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MasterSnapshotVerifier(masterServices, snapshot, workingDirFs);<a
name="line.135"></a>
+<span class="sourceLineNo">136</span> // update the running tasks<a
name="line.136"></a>
+<span class="sourceLineNo">137</span> this.status =
TaskMonitor.get().createStatus(<a name="line.137"></a>
+<span class="sourceLineNo">138</span> "Taking " + snapshot.getType() + "
snapshot on table: " + snapshotTable);<a name="line.138"></a>
+<span class="sourceLineNo">139</span> }<a name="line.139"></a>
+<span class="sourceLineNo">140</span><a name="line.140"></a>
+<span class="sourceLineNo">141</span> private TableDescriptor
loadTableDescriptor()<a name="line.141"></a>
+<span class="sourceLineNo">142</span> throws FileNotFoundException,
IOException {<a name="line.142"></a>
+<span class="sourceLineNo">143</span> TableDescriptor htd =<a
name="line.143"></a>
+<span class="sourceLineNo">144</span>
this.master.getTableDescriptors().get(snapshotTable);<a name="line.144"></a>
+<span class="sourceLineNo">145</span> if (htd == null) {<a
name="line.145"></a>
+<span class="sourceLineNo">146</span> throw new
IOException("TableDescriptor missing for " + snapshotTable);<a
name="line.146"></a>
+<span class="sourceLineNo">147</span> }<a name="line.147"></a>
+<span class="sourceLineNo">148</span> return htd;<a name="line.148"></a>
+<span class="sourceLineNo">149</span> }<a name="line.149"></a>
+<span class="sourceLineNo">150</span><a name="line.150"></a>
+<span class="sourceLineNo">151</span> @Override<a name="line.151"></a>
+<span class="sourceLineNo">152</span> public TakeSnapshotHandler prepare()
throws Exception {<a name="line.152"></a>
+<span class="sourceLineNo">153</span> super.prepare();<a
name="line.153"></a>
+<span class="sourceLineNo">154</span> // after this, you should ensure to
release this lock in case of exceptions<a name="line.154"></a>
+<span class="sourceLineNo">155</span> this.tableLock.acquire();<a
name="line.155"></a>
+<span class="sourceLineNo">156</span> try {<a name="line.156"></a>
+<span class="sourceLineNo">157</span> this.htd = loadTableDescriptor();
// check that .tableinfo is present<a name="line.157"></a>
+<span class="sourceLineNo">158</span> } catch (Exception e) {<a
name="line.158"></a>
+<span class="sourceLineNo">159</span> this.tableLock.release();<a
name="line.159"></a>
+<span class="sourceLineNo">160</span> throw e;<a name="line.160"></a>
+<span class="sourceLineNo">161</span> }<a name="line.161"></a>
+<span class="sourceLineNo">162</span> return this;<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> * Execute the core common portions of
taking a snapshot. The {@link #snapshotRegions(List)}<a name="line.166"></a>
+<span class="sourceLineNo">167</span> * call should get implemented for each
snapshot flavor.<a name="line.167"></a>
+<span class="sourceLineNo">168</span> */<a name="line.168"></a>
+<span class="sourceLineNo">169</span> @Override<a name="line.169"></a>
+<span class="sourceLineNo">170</span>
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="REC_CATCH_EXCEPTION",<a
name="line.170"></a>
+<span class="sourceLineNo">171</span> justification="Intentional")<a
name="line.171"></a>
+<span class="sourceLineNo">172</span> public void process() {<a
name="line.172"></a>
+<span class="sourceLineNo">173</span> String msg = "Running " +
snapshot.getType() + " table snapshot " + snapshot.getName() + " "<a
name="line.173"></a>
+<span class="sourceLineNo">174</span> + eventType + " on table " +
snapshotTable;<a name="line.174"></a>
+<span class="sourceLineNo">175</span> LOG.info(msg);<a name="line.175"></a>
+<span class="sourceLineNo">176</span> MasterLock tableLockToRelease =
this.tableLock;<a name="line.176"></a>
+<span class="sourceLineNo">177</span> status.setStatus(msg);<a
name="line.177"></a>
+<span class="sourceLineNo">178</span> try {<a name="line.178"></a>
+<span class="sourceLineNo">179</span> if (downgradeToSharedTableLock())
{<a name="line.179"></a>
+<span class="sourceLineNo">180</span> // release the exclusive lock and
hold the shared lock instead<a name="line.180"></a>
+<span class="sourceLineNo">181</span> tableLockToRelease =
master.getLockManager().createMasterLock(snapshotTable,<a name="line.181"></a>
+<span class="sourceLineNo">182</span> LockType.SHARED,
this.getClass().getName() + ": take snapshot " + snapshot.getName());<a
name="line.182"></a>
+<span class="sourceLineNo">183</span> tableLock.release();<a
name="line.183"></a>
+<span class="sourceLineNo">184</span> tableLockToRelease.acquire();<a
name="line.184"></a>
+<span class="sourceLineNo">185</span> }<a name="line.185"></a>
+<span class="sourceLineNo">186</span> // If regions move after this meta
scan, the region specific snapshot should fail, triggering<a
name="line.186"></a>
+<span class="sourceLineNo">187</span> // an external exception that gets
captured here.<a name="line.187"></a>
+<span class="sourceLineNo">188</span><a name="line.188"></a>
+<span class="sourceLineNo">189</span> // write down the snapshot info in
the working directory<a name="line.189"></a>
+<span class="sourceLineNo">190</span>
SnapshotDescriptionUtils.writeSnapshotInfo(snapshot, workingDir,
workingDirFs);<a name="line.190"></a>
+<span class="sourceLineNo">191</span>
snapshotManifest.addTableDescriptor(this.htd);<a name="line.191"></a>
+<span class="sourceLineNo">192</span> monitor.rethrowException();<a
name="line.192"></a>
+<span class="sourceLineNo">193</span><a name="line.193"></a>
+<span class="sourceLineNo">194</span> List<Pair<RegionInfo,
ServerName>> regionsAndLocations;<a name="line.194"></a>
+<span class="sourceLineNo">195</span> if
(TableName.META_TABLE_NAME.equals(snapshotTable)) {<a name="line.195"></a>
+<span class="sourceLineNo">196</span> regionsAndLocations = new
MetaTableLocator().getMetaRegionsAndLocations(<a name="line.196"></a>
+<span class="sourceLineNo">197</span> server.getZooKeeper());<a
name="line.197"></a>
+<span class="sourceLineNo">198</span> } else {<a name="line.198"></a>
+<span class="sourceLineNo">199</span> regionsAndLocations =
MetaTableAccessor.getTableRegionsAndLocations(<a name="line.199"></a>
+<span class="sourceLineNo">200</span> server.getConnection(),
snapshotTable, false);<a name="line.200"></a>
+<span class="sourceLineNo">201</span> }<a name="line.201"></a>
+<span class="sourceLineNo">202</span><a name="line.202"></a>
+<span class="sourceLineNo">203</span> // run the snapshot<a
name="line.203"></a>
+<span class="sourceLineNo">204</span>
snapshotRegions(regionsAndLocations);<a name="line.204"></a>
+<span class="sourceLineNo">205</span> monitor.rethrowException();<a
name="line.205"></a>
+<span class="sourceLineNo">206</span><a name="line.206"></a>
+<span class="sourceLineNo">207</span> // extract each pair to separate
lists<a name="line.207"></a>
+<span class="sourceLineNo">208</span> Set<String> serverNames = new
HashSet<>();<a name="line.208"></a>
+<span class="sourceLineNo">209</span> for (Pair<RegionInfo,
ServerName> p : regionsAndLocations) {<a name="line.209"></a>
+<span class="sourceLineNo">210</span> if (p != null &&
p.getFirst() != null && p.getSecond() != null) {<a name="line.210"></a>
+<span class="sourceLineNo">211</span> RegionInfo hri =
p.getFirst();<a name="line.211"></a>
+<span class="sourceLineNo">212</span> if (hri.isOffline() &&
(hri.isSplit() || hri.isSplitParent())) continue;<a name="line.212"></a>
+<span class="sourceLineNo">213</span>
serverNames.add(p.getSecond().toString());<a name="line.213"></a>
+<span class="sourceLineNo">214</span> }<a name="line.214"></a>
+<span class="sourceLineNo">215</span> }<a name="line.215"></a>
+<span class="sourceLineNo">216</span><a name="line.216"></a>
+<span class="sourceLineNo">217</span> // flush the in-memory state, and
write the single manifest<a name="line.217"></a>
+<span class="sourceLineNo">218</span> status.setStatus("Consolidate
snapshot: " + snapshot.getName());<a name="line.218"></a>
+<span class="sourceLineNo">219</span> snapshotManifest.consolidate();<a
name="line.219"></a>
+<span class="sourceLineNo">220</span><a name="line.220"></a>
+<span class="sourceLineNo">221</span> // verify the snapshot is valid<a
name="line.221"></a>
+<span class="sourceLineNo">222</span> status.setStatus("Verifying
snapshot: " + snapshot.getName());<a name="line.222"></a>
+<span class="sourceLineNo">223</span>
verifier.verifySnapshot(this.workingDir, serverNames);<a name="line.223"></a>
+<span class="sourceLineNo">224</span><a name="line.224"></a>
+<span class="sourceLineNo">225</span> // complete the snapshot,
atomically moving from tmp to .snapshot dir.<a name="line.225"></a>
+<span class="sourceLineNo">226</span> completeSnapshot(this.snapshotDir,
this.workingDir, this.rootFs, this.workingDirFs);<a name="line.226"></a>
+<span class="sourceLineNo">227</span> msg = "Snapshot " +
snapshot.getName() + " of table " + snapshotTable + " completed";<a
name="line.227"></a>
+<span class="sourceLineNo">228</span> status.markComplete(msg);<a
name="line.228"></a>
+<span class="sourceLineNo">229</span> LOG.info(msg);<a
name="line.229"></a>
+<span class="sourceLineNo">230</span>
metricsSnapshot.addSnapshot(status.getCompletionTimestamp() -
status.getStartTime());<a name="line.230"></a>
+<span class="sourceLineNo">231</span> } catch (Exception e) { // FindBugs:
REC_CATCH_EXCEPTION<a name="line.231"></a>
+<span class="sourceLineNo">232</span> status.abort("Failed to complete
snapshot " + snapshot.getName() + " on table " +<a name="line.232"></a>
+<span class="sourceLineNo">233</span> snapshotTable + " because " +
e.getMessage());<a name="line.233"></a>
+<span class="sourceLineNo">234</span> String reason = "Failed taking
snapshot " + ClientSnapshotDescriptionUtils.toString(snapshot)<a
name="line.234"></a>
+<span class="sourceLineNo">235</span> + " due to exception:" +
e.getMessage();<a name="line.235"></a>
+<span class="sourceLineNo">236</span> LOG.error(reason, e);<a
name="line.236"></a>
+<span class="sourceLineNo">237</span> ForeignException ee = new
ForeignException(reason, e);<a name="line.237"></a>
+<span class="sourceLineNo">238</span> monitor.receive(ee);<a
name="line.238"></a>
+<span class="sourceLineNo">239</span> // need to mark this completed to
close off and allow cleanup to happen.<a name="line.239"></a>
+<span class="sourceLineNo">240</span> cancel(reason);<a
name="line.240"></a>
+<span class="sourceLineNo">241</span> } finally {<a name="line.241"></a>
+<span class="sourceLineNo">242</span> LOG.debug("Launching cleanup of
working dir:" + workingDir);<a name="line.242"></a>
+<span class="sourceLineNo">243</span> try {<a name="line.243"></a>
+<span class="sourceLineNo">244</span> // if the working dir is still
present, the snapshot has failed. it is present we delete<a
name="line.244"></a>
+<span class="sourceLineNo">245</span> // it.<a name="line.245"></a>
+<span class="sourceLineNo">246</span> if
(!workingDirFs.delete(workingDir, true)) {<a name="line.246"></a>
+<span class="sourceLineNo">247</span> LOG.error("Couldn't delete
snapshot working directory:" + workingDir);<a name="line.247"></a>
+<span class="sourceLineNo">248</span> }<a name="line.248"></a>
+<span class="sourceLineNo">249</span> } catch (IOException e) {<a
name="line.249"></a>
+<span class="sourceLineNo">250</span> LOG.error("Couldn't delete
snapshot working directory:" + workingDir);<a name="line.250"></a>
+<span class="sourceLineNo">251</span> }<a name="line.251"></a>
+<span class="sourceLineNo">252</span> tableLockToRelease.release();<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><a name="line.255"></a>
+<span class="sourceLineNo">256</span> /**<a name="line.256"></a>
+<span class="sourceLineNo">257</span> * Reset the manager to allow another
snapshot to proceed.<a name="line.257"></a>
+<span class="sourceLineNo">258</span> * Commits the snapshot process by
moving the working snapshot<a name="line.258"></a>
+<span class="sourceLineNo">259</span> * to the finalized filepath<a
name="line.259"></a>
+<span class="sourceLineNo">260</span> *<a name="line.260"></a>
+<span class="sourceLineNo">261</span> * @param snapshotDir The file path of
the completed snapshots<a name="line.261"></a>
+<span class="sourceLineNo">262</span> * @param workingDir The file path of
the in progress snapshots<a name="line.262"></a>
+<span class="sourceLineNo">263</span> * @param fs The file system of the
completed snapshots<a name="line.263"></a>
+<span class="sourceLineNo">264</span> * @param workingDirFs The file system
of the in progress snapshots<a name="line.264"></a>
+<span class="sourceLineNo">265</span> *<a name="line.265"></a>
+<span class="sourceLineNo">266</span> * @throws SnapshotCreationException if
the snapshot could not be moved<a name="line.266"></a>
+<span class="sourceLineNo">267</span> * @throws IOException the filesystem
could not be reached<a name="line.267"></a>
+<span class="sourceLineNo">268</span> */<a name="line.268"></a>
+<span class="sourceLineNo">269</span> public void completeSnapshot(Path
snapshotDir, Path workingDir, FileSystem fs,<a name="line.269"></a>
+<span class="sourceLineNo">270</span> FileSystem workingDirFs) throws
SnapshotCreationException, IOException {<a name="line.270"></a>
+<span class="sourceLineNo">271</span> LOG.debug("Sentinel is done, just
moving the snapshot from " + workingDir + " to "<a name="line.271"></a>
+<span class="sourceLineNo">272</span> + snapshotDir);<a
name="line.272"></a>
+<span class="sourceLineNo">273</span> // If the working and completed
snapshot directory are on the same file system, attempt<a name="line.273"></a>
+<span class="sourceLineNo">274</span> // to rename the working snapshot
directory to the completed location. If that fails,<a name="line.274"></a>
+<span class="sourceLineNo">275</span> // or the file systems differ,
attempt to copy the directory over, throwing an exception<a name="line.275"></a>
+<span class="sourceLineNo">276</span> // if this fails<a
name="line.276"></a>
+<span class="sourceLineNo">277</span> URI workingURI =
workingDirFs.getUri();<a name="line.277"></a>
+<span class="sourceLineNo">278</span> URI rootURI = fs.getUri();<a
name="line.278"></a>
+<span class="sourceLineNo">279</span> if
((!workingURI.getScheme().equals(rootURI.getScheme()) ||<a name="line.279"></a>
+<span class="sourceLineNo">280</span>
!workingURI.getAuthority().equals(rootURI.getAuthority()) ||<a
name="line.280"></a>
+<span class="sourceLineNo">281</span> workingURI.getUserInfo() == null
||<a name="line.281"></a>
+<span class="sourceLineNo">282</span>
!workingURI.getUserInfo().equals(rootURI.getUserInfo()) ||<a
name="line.282"></a>
+<span class="sourceLineNo">283</span> !fs.rename(workingDir,
snapshotDir)) && !FileUtil.copy(workingDirFs, workingDir, fs,<a
name="line.283"></a>
+<span class="sourceLineNo">284</span> snapshotDir, true, true,
this.conf)) {<a name="line.284"></a>
+<span class="sourceLineNo">285</span> throw new
SnapshotCreationException("Failed to copy working directory(" + workingDir<a
name="line.285"></a>
+<span class="sourceLineNo">286</span> + ") to completed directory(" +
snapshotDir + ").");<a name="line.286"></a>
+<span class="sourceLineNo">287</span> }<a name="line.287"></a>
+<span class="sourceLineNo">288</span> finished = true;<a
name="line.288"></a>
+<span class="sourceLineNo">289</span> }<a name="line.289"></a>
+<span class="sourceLineNo">290</span><a name="line.290"></a>
+<span class="sourceLineNo">291</span> /**<a name="line.291"></a>
+<span class="sourceLineNo">292</span> * When taking snapshot, first we must
acquire the exclusive table lock to confirm that there are<a
name="line.292"></a>
+<span class="sourceLineNo">293</span> * no ongoing merge/split procedures.
But later, we should try our best to release the exclusive<a
name="line.293"></a>
+<span class="sourceLineNo">294</span> * lock as this may hurt the
availability, because we need to hold the shared lock when assigning<a
name="line.294"></a>
+<span class="sourceLineNo">295</span> * regions.<a name="line.295"></a>
+<span class="sourceLineNo">296</span> * <p/><a name="line.296"></a>
+<span class="sourceLineNo">297</span> * See HBASE-21480 for more details.<a
name="line.297"></a>
+<span class="sourceLineNo">298</span> */<a name="line.298"></a>
+<span class="sourceLineNo">299</span> protected abstract boolean
downgradeToSharedTableLock();<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">302</span> * Snapshot the specified regions<a
name="line.302"></a>
+<span class="sourceLineNo">303</span> */<a name="line.303"></a>
+<span class="sourceLineNo">304</span> protected abstract void
snapshotRegions(List<Pair<RegionInfo, ServerName>> regions)<a
name="line.304"></a>
+<span class="sourceLineNo">305</span> throws IOException,
KeeperException;<a name="line.305"></a>
+<span class="sourceLineNo">306</span><a name="line.306"></a>
+<span class="sourceLineNo">307</span> /**<a name="line.307"></a>
+<span class="sourceLineNo">308</span> * Take a snapshot of the specified
disabled region<a name="line.308"></a>
+<span class="sourceLineNo">309</span> */<a name="line.309"></a>
+<span class="sourceLineNo">310</span> protected void
snapshotDisabledRegion(final RegionInfo regionInfo)<a name="line.310"></a>
+<span class="sourceLineNo">311</span> throws IOException {<a
name="line.311"></a>
+<span class="sourceLineNo">312</span>
snapshotManifest.addRegion(FSUtils.getTableDir(rootDir, snapshotTable),
regionInfo);<a name="line.312"></a>
+<span class="sourceLineNo">313</span> monitor.rethrowException();<a
name="line.313"></a>
+<span class="sourceLineNo">314</span> status.setStatus("Completed
referencing HFiles for offline region " + regionInfo.toString() +<a
name="line.314"></a>
+<span class="sourceLineNo">315</span> " of table: " + snapshotTable);<a
name="line.315"></a>
+<span class="sourceLineNo">316</span> }<a name="line.316"></a>
+<span class="sourceLineNo">317</span><a name="line.317"></a>
+<span class="sourceLineNo">318</span> @Override<a name="line.318"></a>
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name="line.319"></a>
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+<span class="sourceLineNo">321</span><a name="line.321"></a>
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name="line.322"></a>
+<span class="sourceLineNo">323</span> LOG.info("Stop taking snapshot=" +
ClientSnapshotDescriptionUtils.toString(snapshot) +<a name="line.323"></a>
+<span class="sourceLineNo">324</span> " because: " + why);<a
name="line.324"></a>
+<span class="sourceLineNo">325</span> CancellationException ce = new
CancellationException(why);<a name="line.325"></a>
+<span class="sourceLineNo">326</span> monitor.receive(new
ForeignException(master.getServerName().toString(), ce));<a name="line.326"></a>
+<span class="sourceLineNo">327</span> }<a name="line.327"></a>
+<span class="sourceLineNo">328</span><a name="line.328"></a>
+<span class="sourceLineNo">329</span> @Override<a name="line.329"></a>
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name="line.330"></a>
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name="line.331"></a>
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+<span class="sourceLineNo">333</span><a name="line.333"></a>
+<span class="sourceLineNo">334</span> @Override<a name="line.334"></a>
+<span class="sourceLineNo">335</span> public long getCompletionTimestamp()
{<a name="line.335"></a>
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this.status.getCompletionTimestamp();<a name="line.336"></a>
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+<span class="sourceLineNo">338</span><a name="line.338"></a>
+<span class="sourceLineNo">339</span> @Override<a name="line.339"></a>
+<span class="sourceLineNo">340</span> public SnapshotDescription
getSnapshot() {<a name="line.340"></a>
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name="line.341"></a>
+<span class="sourceLineNo">342</span> }<a name="line.342"></a>
+<span class="sourceLineNo">343</span><a name="line.343"></a>
+<span class="sourceLineNo">344</span> @Override<a name="line.344"></a>
+<span class="sourceLineNo">345</span> public ForeignException
getExceptionIfFailed() {<a name="line.345"></a>
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name="line.346"></a>
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+<span class="sourceLineNo">348</span><a name="line.348"></a>
+<span class="sourceLineNo">349</span> @Override<a name="line.349"></a>
+<span class="sourceLineNo">350</span> public void rethrowExceptionIfFailed()
throws ForeignException {<a name="line.350"></a>
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name="line.351"></a>
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+<span class="sourceLineNo">353</span><a name="line.353"></a>
+<span class="sourceLineNo">354</span> @Override<a name="line.354"></a>
+<span class="sourceLineNo">355</span> public void rethrowException() throws
ForeignException {<a name="line.355"></a>
+<span class="sourceLineNo">356</span> monitor.rethrowException();<a
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