http://git-wip-us.apache.org/repos/asf/hbase/blob/ef7355e1/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/OpenRegionHandler.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/OpenRegionHandler.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/OpenRegionHandler.html index 1451e26..44320ff 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/OpenRegionHandler.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/OpenRegionHandler.html @@ -39,196 +39,196 @@ <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.executor.EventType;<a name="line.31"></a> <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;<a name="line.32"></a> <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.regionserver.HRegion;<a name="line.33"></a> -<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.regionserver.RegionServerAccounting;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.regionserver.RegionServerServices;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.regionserver.RegionServerServices.PostOpenDeployContext;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.util.CancelableProgressable;<a name="line.37"></a> -<span class="sourceLineNo">038</span>/**<a name="line.38"></a> -<span class="sourceLineNo">039</span> * Handles opening of a region on a region server.<a name="line.39"></a> -<span class="sourceLineNo">040</span> * <p><a name="line.40"></a> -<span class="sourceLineNo">041</span> * This is executed after receiving an OPEN RPC from the master or client.<a name="line.41"></a> -<span class="sourceLineNo">042</span> */<a name="line.42"></a> -<span class="sourceLineNo">043</span>@InterfaceAudience.Private<a name="line.43"></a> -<span class="sourceLineNo">044</span>public class OpenRegionHandler extends EventHandler {<a name="line.44"></a> -<span class="sourceLineNo">045</span> private static final Log LOG = LogFactory.getLog(OpenRegionHandler.class);<a name="line.45"></a> -<span class="sourceLineNo">046</span><a name="line.46"></a> -<span class="sourceLineNo">047</span> protected final RegionServerServices rsServices;<a name="line.47"></a> -<span class="sourceLineNo">048</span><a name="line.48"></a> -<span class="sourceLineNo">049</span> private final HRegionInfo regionInfo;<a name="line.49"></a> -<span class="sourceLineNo">050</span> private final HTableDescriptor htd;<a name="line.50"></a> -<span class="sourceLineNo">051</span> private final long masterSystemTime;<a name="line.51"></a> -<span class="sourceLineNo">052</span><a name="line.52"></a> -<span class="sourceLineNo">053</span> public OpenRegionHandler(final Server server,<a name="line.53"></a> -<span class="sourceLineNo">054</span> final RegionServerServices rsServices, HRegionInfo regionInfo,<a name="line.54"></a> -<span class="sourceLineNo">055</span> HTableDescriptor htd, long masterSystemTime) {<a name="line.55"></a> -<span class="sourceLineNo">056</span> this(server, rsServices, regionInfo, htd, masterSystemTime, EventType.M_RS_OPEN_REGION);<a name="line.56"></a> -<span class="sourceLineNo">057</span> }<a name="line.57"></a> -<span class="sourceLineNo">058</span><a name="line.58"></a> -<span class="sourceLineNo">059</span> protected OpenRegionHandler(final Server server,<a name="line.59"></a> -<span class="sourceLineNo">060</span> final RegionServerServices rsServices, final HRegionInfo regionInfo,<a name="line.60"></a> -<span class="sourceLineNo">061</span> final HTableDescriptor htd, long masterSystemTime, EventType eventType) {<a name="line.61"></a> -<span class="sourceLineNo">062</span> super(server, eventType);<a name="line.62"></a> -<span class="sourceLineNo">063</span> this.rsServices = rsServices;<a name="line.63"></a> -<span class="sourceLineNo">064</span> this.regionInfo = regionInfo;<a name="line.64"></a> -<span class="sourceLineNo">065</span> this.htd = htd;<a name="line.65"></a> -<span class="sourceLineNo">066</span> this.masterSystemTime = masterSystemTime;<a name="line.66"></a> -<span class="sourceLineNo">067</span> }<a name="line.67"></a> -<span class="sourceLineNo">068</span><a name="line.68"></a> -<span class="sourceLineNo">069</span> public HRegionInfo getRegionInfo() {<a name="line.69"></a> -<span class="sourceLineNo">070</span> return regionInfo;<a name="line.70"></a> -<span class="sourceLineNo">071</span> }<a name="line.71"></a> -<span class="sourceLineNo">072</span><a name="line.72"></a> -<span class="sourceLineNo">073</span> @Override<a name="line.73"></a> -<span class="sourceLineNo">074</span> public void process() throws IOException {<a name="line.74"></a> -<span class="sourceLineNo">075</span> boolean openSuccessful = false;<a name="line.75"></a> -<span class="sourceLineNo">076</span> final String regionName = regionInfo.getRegionNameAsString();<a name="line.76"></a> -<span class="sourceLineNo">077</span> HRegion region = null;<a name="line.77"></a> -<span class="sourceLineNo">078</span><a name="line.78"></a> -<span class="sourceLineNo">079</span> try {<a name="line.79"></a> -<span class="sourceLineNo">080</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.80"></a> -<span class="sourceLineNo">081</span> return;<a name="line.81"></a> -<span class="sourceLineNo">082</span> }<a name="line.82"></a> -<span class="sourceLineNo">083</span> final String encodedName = regionInfo.getEncodedName();<a name="line.83"></a> -<span class="sourceLineNo">084</span><a name="line.84"></a> -<span class="sourceLineNo">085</span> // 2 different difficult situations can occur<a name="line.85"></a> -<span class="sourceLineNo">086</span> // 1) The opening was cancelled. This is an expected situation<a name="line.86"></a> -<span class="sourceLineNo">087</span> // 2) The region is now marked as online while we're suppose to open. This would be a bug.<a name="line.87"></a> -<span class="sourceLineNo">088</span><a name="line.88"></a> -<span class="sourceLineNo">089</span> // Check that this region is not already online<a name="line.89"></a> -<span class="sourceLineNo">090</span> if (this.rsServices.getFromOnlineRegions(encodedName) != null) {<a name="line.90"></a> -<span class="sourceLineNo">091</span> LOG.error("Region " + encodedName +<a name="line.91"></a> -<span class="sourceLineNo">092</span> " was already online when we started processing the opening. " +<a name="line.92"></a> -<span class="sourceLineNo">093</span> "Marking this new attempt as failed");<a name="line.93"></a> -<span class="sourceLineNo">094</span> return;<a name="line.94"></a> -<span class="sourceLineNo">095</span> }<a name="line.95"></a> -<span class="sourceLineNo">096</span><a name="line.96"></a> -<span class="sourceLineNo">097</span> // Check that we're still supposed to open the region.<a name="line.97"></a> -<span class="sourceLineNo">098</span> // If fails, just return. Someone stole the region from under us.<a name="line.98"></a> -<span class="sourceLineNo">099</span> if (!isRegionStillOpening()){<a name="line.99"></a> -<span class="sourceLineNo">100</span> LOG.error("Region " + encodedName + " opening cancelled");<a name="line.100"></a> -<span class="sourceLineNo">101</span> return;<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> // Open region. After a successful open, failures in subsequent<a name="line.104"></a> -<span class="sourceLineNo">105</span> // processing needs to do a close as part of cleanup.<a name="line.105"></a> -<span class="sourceLineNo">106</span> region = openRegion();<a name="line.106"></a> -<span class="sourceLineNo">107</span> if (region == null) {<a name="line.107"></a> -<span class="sourceLineNo">108</span> return;<a name="line.108"></a> -<span class="sourceLineNo">109</span> }<a name="line.109"></a> -<span class="sourceLineNo">110</span><a name="line.110"></a> -<span class="sourceLineNo">111</span> if (!updateMeta(region, masterSystemTime) || this.server.isStopped() ||<a name="line.111"></a> -<span class="sourceLineNo">112</span> this.rsServices.isStopping()) {<a name="line.112"></a> -<span class="sourceLineNo">113</span> return;<a name="line.113"></a> -<span class="sourceLineNo">114</span> }<a name="line.114"></a> -<span class="sourceLineNo">115</span><a name="line.115"></a> -<span class="sourceLineNo">116</span> if (!isRegionStillOpening()) {<a name="line.116"></a> -<span class="sourceLineNo">117</span> return;<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> // Successful region open, and add it to OnlineRegions<a name="line.120"></a> -<span class="sourceLineNo">121</span> this.rsServices.addToOnlineRegions(region);<a name="line.121"></a> -<span class="sourceLineNo">122</span> openSuccessful = true;<a name="line.122"></a> -<span class="sourceLineNo">123</span><a name="line.123"></a> -<span class="sourceLineNo">124</span> // Done! Successful region open<a name="line.124"></a> -<span class="sourceLineNo">125</span> LOG.debug("Opened " + regionName + " on " +<a name="line.125"></a> -<span class="sourceLineNo">126</span> this.server.getServerName());<a name="line.126"></a> -<span class="sourceLineNo">127</span> } finally {<a name="line.127"></a> -<span class="sourceLineNo">128</span> // Do all clean up here<a name="line.128"></a> -<span class="sourceLineNo">129</span> if (!openSuccessful) {<a name="line.129"></a> -<span class="sourceLineNo">130</span> doCleanUpOnFailedOpen(region);<a name="line.130"></a> -<span class="sourceLineNo">131</span> }<a name="line.131"></a> -<span class="sourceLineNo">132</span> final Boolean current = this.rsServices.getRegionsInTransitionInRS().<a name="line.132"></a> -<span class="sourceLineNo">133</span> remove(this.regionInfo.getEncodedNameAsBytes());<a name="line.133"></a> -<span class="sourceLineNo">134</span><a name="line.134"></a> -<span class="sourceLineNo">135</span> // Let's check if we have met a race condition on open cancellation....<a name="line.135"></a> -<span class="sourceLineNo">136</span> // A better solution would be to not have any race condition.<a name="line.136"></a> -<span class="sourceLineNo">137</span> // this.rsServices.getRegionsInTransitionInRS().remove(<a name="line.137"></a> -<span class="sourceLineNo">138</span> // this.regionInfo.getEncodedNameAsBytes(), Boolean.TRUE);<a name="line.138"></a> -<span class="sourceLineNo">139</span> // would help.<a name="line.139"></a> -<span class="sourceLineNo">140</span> if (openSuccessful) {<a name="line.140"></a> -<span class="sourceLineNo">141</span> if (current == null) { // Should NEVER happen, but let's be paranoid.<a name="line.141"></a> -<span class="sourceLineNo">142</span> LOG.error("Bad state: we've just opened a region that was NOT in transition. Region="<a name="line.142"></a> -<span class="sourceLineNo">143</span> + regionName);<a name="line.143"></a> -<span class="sourceLineNo">144</span> } else if (Boolean.FALSE.equals(current)) { // Can happen, if we're<a name="line.144"></a> -<span class="sourceLineNo">145</span> // really unlucky.<a name="line.145"></a> -<span class="sourceLineNo">146</span> LOG.error("Race condition: we've finished to open a region, while a close was requested "<a name="line.146"></a> -<span class="sourceLineNo">147</span> + " on region=" + regionName + ". It can be a critical error, as a region that"<a name="line.147"></a> -<span class="sourceLineNo">148</span> + " should be closed is now opened. Closing it now");<a name="line.148"></a> -<span class="sourceLineNo">149</span> cleanupFailedOpen(region);<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> }<a name="line.152"></a> -<span class="sourceLineNo">153</span> }<a name="line.153"></a> -<span class="sourceLineNo">154</span><a name="line.154"></a> -<span class="sourceLineNo">155</span> private void doCleanUpOnFailedOpen(HRegion region)<a name="line.155"></a> -<span class="sourceLineNo">156</span> throws IOException {<a name="line.156"></a> -<span class="sourceLineNo">157</span> try {<a name="line.157"></a> -<span class="sourceLineNo">158</span> if (region != null) {<a name="line.158"></a> -<span class="sourceLineNo">159</span> cleanupFailedOpen(region);<a name="line.159"></a> -<span class="sourceLineNo">160</span> }<a name="line.160"></a> -<span class="sourceLineNo">161</span> } finally {<a name="line.161"></a> -<span class="sourceLineNo">162</span> rsServices.reportRegionStateTransition(TransitionCode.FAILED_OPEN, regionInfo);<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> /**<a name="line.166"></a> -<span class="sourceLineNo">167</span> * Update ZK or META. This can take a while if for example the<a name="line.167"></a> -<span class="sourceLineNo">168</span> * hbase:meta is not available -- if server hosting hbase:meta crashed and we are<a name="line.168"></a> -<span class="sourceLineNo">169</span> * waiting on it to come back -- so run in a thread and keep updating znode<a name="line.169"></a> -<span class="sourceLineNo">170</span> * state meantime so master doesn't timeout our region-in-transition.<a name="line.170"></a> -<span class="sourceLineNo">171</span> * Caller must cleanup region if this fails.<a name="line.171"></a> -<span class="sourceLineNo">172</span> */<a name="line.172"></a> -<span class="sourceLineNo">173</span> boolean updateMeta(final HRegion r, long masterSystemTime) {<a name="line.173"></a> -<span class="sourceLineNo">174</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.174"></a> -<span class="sourceLineNo">175</span> return false;<a name="line.175"></a> -<span class="sourceLineNo">176</span> }<a name="line.176"></a> -<span class="sourceLineNo">177</span> // Object we do wait/notify on. Make it boolean. If set, we're done.<a name="line.177"></a> -<span class="sourceLineNo">178</span> // Else, wait.<a name="line.178"></a> -<span class="sourceLineNo">179</span> final AtomicBoolean signaller = new AtomicBoolean(false);<a name="line.179"></a> -<span class="sourceLineNo">180</span> PostOpenDeployTasksThread t = new PostOpenDeployTasksThread(r,<a name="line.180"></a> -<span class="sourceLineNo">181</span> this.server, this.rsServices, signaller, masterSystemTime);<a name="line.181"></a> -<span class="sourceLineNo">182</span> t.start();<a name="line.182"></a> -<span class="sourceLineNo">183</span> // Post open deploy task:<a name="line.183"></a> -<span class="sourceLineNo">184</span> // meta => update meta location in ZK<a name="line.184"></a> -<span class="sourceLineNo">185</span> // other region => update meta<a name="line.185"></a> -<span class="sourceLineNo">186</span> while (!signaller.get() && t.isAlive() && !this.server.isStopped() &&<a name="line.186"></a> -<span class="sourceLineNo">187</span> !this.rsServices.isStopping() && isRegionStillOpening()) {<a name="line.187"></a> -<span class="sourceLineNo">188</span> synchronized (signaller) {<a name="line.188"></a> -<span class="sourceLineNo">189</span> try {<a name="line.189"></a> -<span class="sourceLineNo">190</span> // Wait for 10 seconds, so that server shutdown<a name="line.190"></a> -<span class="sourceLineNo">191</span> // won't take too long if this thread happens to run.<a name="line.191"></a> -<span class="sourceLineNo">192</span> if (!signaller.get()) signaller.wait(10000);<a name="line.192"></a> -<span class="sourceLineNo">193</span> } catch (InterruptedException e) {<a name="line.193"></a> -<span class="sourceLineNo">194</span> // Go to the loop check.<a name="line.194"></a> -<span class="sourceLineNo">195</span> }<a name="line.195"></a> -<span class="sourceLineNo">196</span> }<a name="line.196"></a> -<span class="sourceLineNo">197</span> }<a name="line.197"></a> -<span class="sourceLineNo">198</span> // Is thread still alive? We may have left above loop because server is<a name="line.198"></a> -<span class="sourceLineNo">199</span> // stopping or we timed out the edit. Is so, interrupt it.<a name="line.199"></a> -<span class="sourceLineNo">200</span> if (t.isAlive()) {<a name="line.200"></a> -<span class="sourceLineNo">201</span> if (!signaller.get()) {<a name="line.201"></a> -<span class="sourceLineNo">202</span> // Thread still running; interrupt<a name="line.202"></a> -<span class="sourceLineNo">203</span> LOG.debug("Interrupting thread " + t);<a name="line.203"></a> -<span class="sourceLineNo">204</span> t.interrupt();<a name="line.204"></a> -<span class="sourceLineNo">205</span> }<a name="line.205"></a> -<span class="sourceLineNo">206</span> try {<a name="line.206"></a> -<span class="sourceLineNo">207</span> t.join();<a name="line.207"></a> -<span class="sourceLineNo">208</span> } catch (InterruptedException ie) {<a name="line.208"></a> -<span class="sourceLineNo">209</span> LOG.warn("Interrupted joining " +<a name="line.209"></a> -<span class="sourceLineNo">210</span> r.getRegionInfo().getRegionNameAsString(), ie);<a name="line.210"></a> -<span class="sourceLineNo">211</span> Thread.currentThread().interrupt();<a name="line.211"></a> -<span class="sourceLineNo">212</span> }<a name="line.212"></a> -<span class="sourceLineNo">213</span> }<a name="line.213"></a> -<span class="sourceLineNo">214</span><a name="line.214"></a> -<span class="sourceLineNo">215</span> // Was there an exception opening the region? This should trigger on<a name="line.215"></a> -<span class="sourceLineNo">216</span> // InterruptedException too. If so, we failed.<a name="line.216"></a> -<span class="sourceLineNo">217</span> return (!Thread.interrupted() && t.getException() == null);<a name="line.217"></a> -<span class="sourceLineNo">218</span> }<a name="line.218"></a> -<span class="sourceLineNo">219</span><a name="line.219"></a> -<span class="sourceLineNo">220</span> /**<a name="line.220"></a> -<span class="sourceLineNo">221</span> * Thread to run region post open tasks. Call {@link #getException()} after<a name="line.221"></a> -<span class="sourceLineNo">222</span> * the thread finishes to check for exceptions running<a name="line.222"></a> -<span class="sourceLineNo">223</span> * {@link RegionServerServices#postOpenDeployTasks(HRegion)<a name="line.223"></a> +<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.regionserver.Region;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.regionserver.RegionServerAccounting;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.regionserver.RegionServerServices;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.regionserver.RegionServerServices.PostOpenDeployContext;<a name="line.37"></a> +<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.util.CancelableProgressable;<a name="line.38"></a> +<span class="sourceLineNo">039</span>/**<a name="line.39"></a> +<span class="sourceLineNo">040</span> * Handles opening of a region on a region server.<a name="line.40"></a> +<span class="sourceLineNo">041</span> * <p><a name="line.41"></a> +<span class="sourceLineNo">042</span> * This is executed after receiving an OPEN RPC from the master or client.<a name="line.42"></a> +<span class="sourceLineNo">043</span> */<a name="line.43"></a> +<span class="sourceLineNo">044</span>@InterfaceAudience.Private<a name="line.44"></a> +<span class="sourceLineNo">045</span>public class OpenRegionHandler extends EventHandler {<a name="line.45"></a> +<span class="sourceLineNo">046</span> private static final Log LOG = LogFactory.getLog(OpenRegionHandler.class);<a name="line.46"></a> +<span class="sourceLineNo">047</span><a name="line.47"></a> +<span class="sourceLineNo">048</span> protected final RegionServerServices rsServices;<a name="line.48"></a> +<span class="sourceLineNo">049</span><a name="line.49"></a> +<span class="sourceLineNo">050</span> private final HRegionInfo regionInfo;<a name="line.50"></a> +<span class="sourceLineNo">051</span> private final HTableDescriptor htd;<a name="line.51"></a> +<span class="sourceLineNo">052</span> private final long masterSystemTime;<a name="line.52"></a> +<span class="sourceLineNo">053</span><a name="line.53"></a> +<span class="sourceLineNo">054</span> public OpenRegionHandler(final Server server,<a name="line.54"></a> +<span class="sourceLineNo">055</span> final RegionServerServices rsServices, HRegionInfo regionInfo,<a name="line.55"></a> +<span class="sourceLineNo">056</span> HTableDescriptor htd, long masterSystemTime) {<a name="line.56"></a> +<span class="sourceLineNo">057</span> this(server, rsServices, regionInfo, htd, masterSystemTime, EventType.M_RS_OPEN_REGION);<a name="line.57"></a> +<span class="sourceLineNo">058</span> }<a name="line.58"></a> +<span class="sourceLineNo">059</span><a name="line.59"></a> +<span class="sourceLineNo">060</span> protected OpenRegionHandler(final Server server,<a name="line.60"></a> +<span class="sourceLineNo">061</span> final RegionServerServices rsServices, final HRegionInfo regionInfo,<a name="line.61"></a> +<span class="sourceLineNo">062</span> final HTableDescriptor htd, long masterSystemTime, EventType eventType) {<a name="line.62"></a> +<span class="sourceLineNo">063</span> super(server, eventType);<a name="line.63"></a> +<span class="sourceLineNo">064</span> this.rsServices = rsServices;<a name="line.64"></a> +<span class="sourceLineNo">065</span> this.regionInfo = regionInfo;<a name="line.65"></a> +<span class="sourceLineNo">066</span> this.htd = htd;<a name="line.66"></a> +<span class="sourceLineNo">067</span> this.masterSystemTime = masterSystemTime;<a name="line.67"></a> +<span class="sourceLineNo">068</span> }<a name="line.68"></a> +<span class="sourceLineNo">069</span><a name="line.69"></a> +<span class="sourceLineNo">070</span> public HRegionInfo getRegionInfo() {<a name="line.70"></a> +<span class="sourceLineNo">071</span> return regionInfo;<a name="line.71"></a> +<span class="sourceLineNo">072</span> }<a name="line.72"></a> +<span class="sourceLineNo">073</span><a name="line.73"></a> +<span class="sourceLineNo">074</span> @Override<a name="line.74"></a> +<span class="sourceLineNo">075</span> public void process() throws IOException {<a name="line.75"></a> +<span class="sourceLineNo">076</span> boolean openSuccessful = false;<a name="line.76"></a> +<span class="sourceLineNo">077</span> final String regionName = regionInfo.getRegionNameAsString();<a name="line.77"></a> +<span class="sourceLineNo">078</span> HRegion region = null;<a name="line.78"></a> +<span class="sourceLineNo">079</span><a name="line.79"></a> +<span class="sourceLineNo">080</span> try {<a name="line.80"></a> +<span class="sourceLineNo">081</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.81"></a> +<span class="sourceLineNo">082</span> return;<a name="line.82"></a> +<span class="sourceLineNo">083</span> }<a name="line.83"></a> +<span class="sourceLineNo">084</span> final String encodedName = regionInfo.getEncodedName();<a name="line.84"></a> +<span class="sourceLineNo">085</span><a name="line.85"></a> +<span class="sourceLineNo">086</span> // 2 different difficult situations can occur<a name="line.86"></a> +<span class="sourceLineNo">087</span> // 1) The opening was cancelled. This is an expected situation<a name="line.87"></a> +<span class="sourceLineNo">088</span> // 2) The region is now marked as online while we're suppose to open. This would be a bug.<a name="line.88"></a> +<span class="sourceLineNo">089</span><a name="line.89"></a> +<span class="sourceLineNo">090</span> // Check that this region is not already online<a name="line.90"></a> +<span class="sourceLineNo">091</span> if (this.rsServices.getFromOnlineRegions(encodedName) != null) {<a name="line.91"></a> +<span class="sourceLineNo">092</span> LOG.error("Region " + encodedName +<a name="line.92"></a> +<span class="sourceLineNo">093</span> " was already online when we started processing the opening. " +<a name="line.93"></a> +<span class="sourceLineNo">094</span> "Marking this new attempt as failed");<a name="line.94"></a> +<span class="sourceLineNo">095</span> return;<a name="line.95"></a> +<span class="sourceLineNo">096</span> }<a name="line.96"></a> +<span class="sourceLineNo">097</span><a name="line.97"></a> +<span class="sourceLineNo">098</span> // Check that we're still supposed to open the region.<a name="line.98"></a> +<span class="sourceLineNo">099</span> // If fails, just return. Someone stole the region from under us.<a name="line.99"></a> +<span class="sourceLineNo">100</span> if (!isRegionStillOpening()){<a name="line.100"></a> +<span class="sourceLineNo">101</span> LOG.error("Region " + encodedName + " opening cancelled");<a name="line.101"></a> +<span class="sourceLineNo">102</span> return;<a name="line.102"></a> +<span class="sourceLineNo">103</span> }<a name="line.103"></a> +<span class="sourceLineNo">104</span><a name="line.104"></a> +<span class="sourceLineNo">105</span> // Open region. After a successful open, failures in subsequent<a name="line.105"></a> +<span class="sourceLineNo">106</span> // processing needs to do a close as part of cleanup.<a name="line.106"></a> +<span class="sourceLineNo">107</span> region = openRegion();<a name="line.107"></a> +<span class="sourceLineNo">108</span> if (region == null) {<a name="line.108"></a> +<span class="sourceLineNo">109</span> return;<a name="line.109"></a> +<span class="sourceLineNo">110</span> }<a name="line.110"></a> +<span class="sourceLineNo">111</span><a name="line.111"></a> +<span class="sourceLineNo">112</span> if (!updateMeta(region, masterSystemTime) || this.server.isStopped() ||<a name="line.112"></a> +<span class="sourceLineNo">113</span> this.rsServices.isStopping()) {<a name="line.113"></a> +<span class="sourceLineNo">114</span> return;<a name="line.114"></a> +<span class="sourceLineNo">115</span> }<a name="line.115"></a> +<span class="sourceLineNo">116</span><a name="line.116"></a> +<span class="sourceLineNo">117</span> if (!isRegionStillOpening()) {<a name="line.117"></a> +<span class="sourceLineNo">118</span> return;<a name="line.118"></a> +<span class="sourceLineNo">119</span> }<a name="line.119"></a> +<span class="sourceLineNo">120</span><a name="line.120"></a> +<span class="sourceLineNo">121</span> // Successful region open, and add it to OnlineRegions<a name="line.121"></a> +<span class="sourceLineNo">122</span> this.rsServices.addToOnlineRegions(region);<a name="line.122"></a> +<span class="sourceLineNo">123</span> openSuccessful = true;<a name="line.123"></a> +<span class="sourceLineNo">124</span><a name="line.124"></a> +<span class="sourceLineNo">125</span> // Done! Successful region open<a name="line.125"></a> +<span class="sourceLineNo">126</span> LOG.debug("Opened " + regionName + " on " +<a name="line.126"></a> +<span class="sourceLineNo">127</span> this.server.getServerName());<a name="line.127"></a> +<span class="sourceLineNo">128</span> } finally {<a name="line.128"></a> +<span class="sourceLineNo">129</span> // Do all clean up here<a name="line.129"></a> +<span class="sourceLineNo">130</span> if (!openSuccessful) {<a name="line.130"></a> +<span class="sourceLineNo">131</span> doCleanUpOnFailedOpen(region);<a name="line.131"></a> +<span class="sourceLineNo">132</span> }<a name="line.132"></a> +<span class="sourceLineNo">133</span> final Boolean current = this.rsServices.getRegionsInTransitionInRS().<a name="line.133"></a> +<span class="sourceLineNo">134</span> remove(this.regionInfo.getEncodedNameAsBytes());<a name="line.134"></a> +<span class="sourceLineNo">135</span><a name="line.135"></a> +<span class="sourceLineNo">136</span> // Let's check if we have met a race condition on open cancellation....<a name="line.136"></a> +<span class="sourceLineNo">137</span> // A better solution would be to not have any race condition.<a name="line.137"></a> +<span class="sourceLineNo">138</span> // this.rsServices.getRegionsInTransitionInRS().remove(<a name="line.138"></a> +<span class="sourceLineNo">139</span> // this.regionInfo.getEncodedNameAsBytes(), Boolean.TRUE);<a name="line.139"></a> +<span class="sourceLineNo">140</span> // would help.<a name="line.140"></a> +<span class="sourceLineNo">141</span> if (openSuccessful) {<a name="line.141"></a> +<span class="sourceLineNo">142</span> if (current == null) { // Should NEVER happen, but let's be paranoid.<a name="line.142"></a> +<span class="sourceLineNo">143</span> LOG.error("Bad state: we've just opened a region that was NOT in transition. Region="<a name="line.143"></a> +<span class="sourceLineNo">144</span> + regionName);<a name="line.144"></a> +<span class="sourceLineNo">145</span> } else if (Boolean.FALSE.equals(current)) { // Can happen, if we're<a name="line.145"></a> +<span class="sourceLineNo">146</span> // really unlucky.<a name="line.146"></a> +<span class="sourceLineNo">147</span> LOG.error("Race condition: we've finished to open a region, while a close was requested "<a name="line.147"></a> +<span class="sourceLineNo">148</span> + " on region=" + regionName + ". It can be a critical error, as a region that"<a name="line.148"></a> +<span class="sourceLineNo">149</span> + " should be closed is now opened. Closing it now");<a name="line.149"></a> +<span class="sourceLineNo">150</span> cleanupFailedOpen(region);<a name="line.150"></a> +<span class="sourceLineNo">151</span> }<a name="line.151"></a> +<span class="sourceLineNo">152</span> }<a name="line.152"></a> +<span class="sourceLineNo">153</span> }<a name="line.153"></a> +<span class="sourceLineNo">154</span> }<a name="line.154"></a> +<span class="sourceLineNo">155</span><a name="line.155"></a> +<span class="sourceLineNo">156</span> private void doCleanUpOnFailedOpen(HRegion region)<a name="line.156"></a> +<span class="sourceLineNo">157</span> throws IOException {<a name="line.157"></a> +<span class="sourceLineNo">158</span> try {<a name="line.158"></a> +<span class="sourceLineNo">159</span> if (region != null) {<a name="line.159"></a> +<span class="sourceLineNo">160</span> cleanupFailedOpen(region);<a name="line.160"></a> +<span class="sourceLineNo">161</span> }<a name="line.161"></a> +<span class="sourceLineNo">162</span> } finally {<a name="line.162"></a> +<span class="sourceLineNo">163</span> rsServices.reportRegionStateTransition(TransitionCode.FAILED_OPEN, regionInfo);<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> /**<a name="line.167"></a> +<span class="sourceLineNo">168</span> * Update ZK or META. This can take a while if for example the<a name="line.168"></a> +<span class="sourceLineNo">169</span> * hbase:meta is not available -- if server hosting hbase:meta crashed and we are<a name="line.169"></a> +<span class="sourceLineNo">170</span> * waiting on it to come back -- so run in a thread and keep updating znode<a name="line.170"></a> +<span class="sourceLineNo">171</span> * state meantime so master doesn't timeout our region-in-transition.<a name="line.171"></a> +<span class="sourceLineNo">172</span> * Caller must cleanup region if this fails.<a name="line.172"></a> +<span class="sourceLineNo">173</span> */<a name="line.173"></a> +<span class="sourceLineNo">174</span> boolean updateMeta(final HRegion r, long masterSystemTime) {<a name="line.174"></a> +<span class="sourceLineNo">175</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.175"></a> +<span class="sourceLineNo">176</span> return false;<a name="line.176"></a> +<span class="sourceLineNo">177</span> }<a name="line.177"></a> +<span class="sourceLineNo">178</span> // Object we do wait/notify on. Make it boolean. If set, we're done.<a name="line.178"></a> +<span class="sourceLineNo">179</span> // Else, wait.<a name="line.179"></a> +<span class="sourceLineNo">180</span> final AtomicBoolean signaller = new AtomicBoolean(false);<a name="line.180"></a> +<span class="sourceLineNo">181</span> PostOpenDeployTasksThread t = new PostOpenDeployTasksThread(r,<a name="line.181"></a> +<span class="sourceLineNo">182</span> this.server, this.rsServices, signaller, masterSystemTime);<a name="line.182"></a> +<span class="sourceLineNo">183</span> t.start();<a name="line.183"></a> +<span class="sourceLineNo">184</span> // Post open deploy task:<a name="line.184"></a> +<span class="sourceLineNo">185</span> // meta => update meta location in ZK<a name="line.185"></a> +<span class="sourceLineNo">186</span> // other region => update meta<a name="line.186"></a> +<span class="sourceLineNo">187</span> while (!signaller.get() && t.isAlive() && !this.server.isStopped() &&<a name="line.187"></a> +<span class="sourceLineNo">188</span> !this.rsServices.isStopping() && isRegionStillOpening()) {<a name="line.188"></a> +<span class="sourceLineNo">189</span> synchronized (signaller) {<a name="line.189"></a> +<span class="sourceLineNo">190</span> try {<a name="line.190"></a> +<span class="sourceLineNo">191</span> // Wait for 10 seconds, so that server shutdown<a name="line.191"></a> +<span class="sourceLineNo">192</span> // won't take too long if this thread happens to run.<a name="line.192"></a> +<span class="sourceLineNo">193</span> if (!signaller.get()) signaller.wait(10000);<a name="line.193"></a> +<span class="sourceLineNo">194</span> } catch (InterruptedException e) {<a name="line.194"></a> +<span class="sourceLineNo">195</span> // Go to the loop check.<a name="line.195"></a> +<span class="sourceLineNo">196</span> }<a name="line.196"></a> +<span class="sourceLineNo">197</span> }<a name="line.197"></a> +<span class="sourceLineNo">198</span> }<a name="line.198"></a> +<span class="sourceLineNo">199</span> // Is thread still alive? We may have left above loop because server is<a name="line.199"></a> +<span class="sourceLineNo">200</span> // stopping or we timed out the edit. Is so, interrupt it.<a name="line.200"></a> +<span class="sourceLineNo">201</span> if (t.isAlive()) {<a name="line.201"></a> +<span class="sourceLineNo">202</span> if (!signaller.get()) {<a name="line.202"></a> +<span class="sourceLineNo">203</span> // Thread still running; interrupt<a name="line.203"></a> +<span class="sourceLineNo">204</span> LOG.debug("Interrupting thread " + t);<a name="line.204"></a> +<span class="sourceLineNo">205</span> t.interrupt();<a name="line.205"></a> +<span class="sourceLineNo">206</span> }<a name="line.206"></a> +<span class="sourceLineNo">207</span> try {<a name="line.207"></a> +<span class="sourceLineNo">208</span> t.join();<a name="line.208"></a> +<span class="sourceLineNo">209</span> } catch (InterruptedException ie) {<a name="line.209"></a> +<span class="sourceLineNo">210</span> LOG.warn("Interrupted joining " +<a name="line.210"></a> +<span class="sourceLineNo">211</span> r.getRegionInfo().getRegionNameAsString(), ie);<a name="line.211"></a> +<span class="sourceLineNo">212</span> Thread.currentThread().interrupt();<a name="line.212"></a> +<span class="sourceLineNo">213</span> }<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> // Was there an exception opening the region? This should trigger on<a name="line.216"></a> +<span class="sourceLineNo">217</span> // InterruptedException too. If so, we failed.<a name="line.217"></a> +<span class="sourceLineNo">218</span> return (!Thread.interrupted() && t.getException() == null);<a name="line.218"></a> +<span class="sourceLineNo">219</span> }<a name="line.219"></a> +<span class="sourceLineNo">220</span><a name="line.220"></a> +<span class="sourceLineNo">221</span> /**<a name="line.221"></a> +<span class="sourceLineNo">222</span> * Thread to run region post open tasks. Call {@link #getException()} after the thread finishes<a name="line.222"></a> +<span class="sourceLineNo">223</span> * to check for exceptions running {@link RegionServerServices#postOpenDeployTasks(Region)}.<a name="line.223"></a> <span class="sourceLineNo">224</span> */<a name="line.224"></a> <span class="sourceLineNo">225</span> static class PostOpenDeployTasksThread extends Thread {<a name="line.225"></a> <span class="sourceLineNo">226</span> private Throwable exception = null;<a name="line.226"></a>
http://git-wip-us.apache.org/repos/asf/hbase/blob/ef7355e1/devapidocs/src-html/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.html b/devapidocs/src-html/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.html index f57e724..5fe722b 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.html @@ -71,7 +71,7 @@ <span class="sourceLineNo">063</span> /**<a name="line.63"></a> <span class="sourceLineNo">064</span> * Parse dead server names from znode string servername can contain "-" such as<a name="line.64"></a> <span class="sourceLineNo">065</span> * "ip-10-46-221-101.ec2.internal", so we need skip some "-" during parsing for the following<a name="line.65"></a> -<span class="sourceLineNo">066</span> * cases: 2-ip-10-46-221-101.ec2.internal,52170,1364333181125-<server name>-...<a name="line.66"></a> +<span class="sourceLineNo">066</span> * cases: 2-ip-10-46-221-101.ec2.internal,52170,1364333181125-&lt;server name>-...<a name="line.66"></a> <span class="sourceLineNo">067</span> */<a name="line.67"></a> <span class="sourceLineNo">068</span> private static void<a name="line.68"></a> <span class="sourceLineNo">069</span> extractDeadServersFromZNodeString(String deadServerListStr, List<String> result) {<a name="line.69"></a>
