http://git-wip-us.apache.org/repos/asf/hbase-site/blob/f6f9d4f3/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 4a11f27..7c7966d 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 @@ -49,287 +49,290 @@ <span class="sourceLineNo">041</span> * Handles opening of a region on a region server.<a name="line.41"></a> <span class="sourceLineNo">042</span> * <p><a name="line.42"></a> <span class="sourceLineNo">043</span> * This is executed after receiving an OPEN RPC from the master or client.<a name="line.43"></a> -<span class="sourceLineNo">044</span> */<a name="line.44"></a> -<span class="sourceLineNo">045</span>@InterfaceAudience.Private<a name="line.45"></a> -<span class="sourceLineNo">046</span>public class OpenRegionHandler extends EventHandler {<a name="line.46"></a> -<span class="sourceLineNo">047</span> private static final Logger LOG = LoggerFactory.getLogger(OpenRegionHandler.class);<a name="line.47"></a> -<span class="sourceLineNo">048</span><a name="line.48"></a> -<span class="sourceLineNo">049</span> protected final RegionServerServices rsServices;<a name="line.49"></a> -<span class="sourceLineNo">050</span><a name="line.50"></a> -<span class="sourceLineNo">051</span> private final RegionInfo regionInfo;<a name="line.51"></a> -<span class="sourceLineNo">052</span> private final TableDescriptor htd;<a name="line.52"></a> -<span class="sourceLineNo">053</span> private final long masterSystemTime;<a name="line.53"></a> -<span class="sourceLineNo">054</span><a name="line.54"></a> -<span class="sourceLineNo">055</span> public OpenRegionHandler(final Server server,<a name="line.55"></a> -<span class="sourceLineNo">056</span> final RegionServerServices rsServices, RegionInfo regionInfo,<a name="line.56"></a> -<span class="sourceLineNo">057</span> TableDescriptor htd, long masterSystemTime) {<a name="line.57"></a> -<span class="sourceLineNo">058</span> this(server, rsServices, regionInfo, htd, masterSystemTime, EventType.M_RS_OPEN_REGION);<a name="line.58"></a> -<span class="sourceLineNo">059</span> }<a name="line.59"></a> -<span class="sourceLineNo">060</span><a name="line.60"></a> -<span class="sourceLineNo">061</span> protected OpenRegionHandler(final Server server,<a name="line.61"></a> -<span class="sourceLineNo">062</span> final RegionServerServices rsServices, final RegionInfo regionInfo,<a name="line.62"></a> -<span class="sourceLineNo">063</span> final TableDescriptor htd, long masterSystemTime, EventType eventType) {<a name="line.63"></a> -<span class="sourceLineNo">064</span> super(server, eventType);<a name="line.64"></a> -<span class="sourceLineNo">065</span> this.rsServices = rsServices;<a name="line.65"></a> -<span class="sourceLineNo">066</span> this.regionInfo = regionInfo;<a name="line.66"></a> -<span class="sourceLineNo">067</span> this.htd = htd;<a name="line.67"></a> -<span class="sourceLineNo">068</span> this.masterSystemTime = masterSystemTime;<a name="line.68"></a> -<span class="sourceLineNo">069</span> }<a name="line.69"></a> -<span class="sourceLineNo">070</span><a name="line.70"></a> -<span class="sourceLineNo">071</span> public RegionInfo getRegionInfo() {<a name="line.71"></a> -<span class="sourceLineNo">072</span> return regionInfo;<a name="line.72"></a> -<span class="sourceLineNo">073</span> }<a name="line.73"></a> -<span class="sourceLineNo">074</span><a name="line.74"></a> -<span class="sourceLineNo">075</span> @Override<a name="line.75"></a> -<span class="sourceLineNo">076</span> public void process() throws IOException {<a name="line.76"></a> -<span class="sourceLineNo">077</span> boolean openSuccessful = false;<a name="line.77"></a> -<span class="sourceLineNo">078</span> final String regionName = regionInfo.getRegionNameAsString();<a name="line.78"></a> -<span class="sourceLineNo">079</span> HRegion region = null;<a name="line.79"></a> -<span class="sourceLineNo">080</span><a name="line.80"></a> -<span class="sourceLineNo">081</span> try {<a name="line.81"></a> -<span class="sourceLineNo">082</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.82"></a> -<span class="sourceLineNo">083</span> return;<a name="line.83"></a> -<span class="sourceLineNo">084</span> }<a name="line.84"></a> -<span class="sourceLineNo">085</span> final String encodedName = regionInfo.getEncodedName();<a name="line.85"></a> -<span class="sourceLineNo">086</span><a name="line.86"></a> -<span class="sourceLineNo">087</span> // 2 different difficult situations can occur<a name="line.87"></a> -<span class="sourceLineNo">088</span> // 1) The opening was cancelled. This is an expected situation<a name="line.88"></a> -<span class="sourceLineNo">089</span> // 2) The region is now marked as online while we're suppose to open. This would be a bug.<a name="line.89"></a> -<span class="sourceLineNo">090</span><a name="line.90"></a> -<span class="sourceLineNo">091</span> // Check that this region is not already online<a name="line.91"></a> -<span class="sourceLineNo">092</span> if (this.rsServices.getRegion(encodedName) != null) {<a name="line.92"></a> -<span class="sourceLineNo">093</span> LOG.error("Region " + encodedName +<a name="line.93"></a> -<span class="sourceLineNo">094</span> " was already online when we started processing the opening. " +<a name="line.94"></a> -<span class="sourceLineNo">095</span> "Marking this new attempt as failed");<a name="line.95"></a> -<span class="sourceLineNo">096</span> return;<a name="line.96"></a> -<span class="sourceLineNo">097</span> }<a name="line.97"></a> -<span class="sourceLineNo">098</span><a name="line.98"></a> -<span class="sourceLineNo">099</span> // Check that we're still supposed to open the region.<a name="line.99"></a> -<span class="sourceLineNo">100</span> // If fails, just return. Someone stole the region from under us.<a name="line.100"></a> -<span class="sourceLineNo">101</span> if (!isRegionStillOpening()){<a name="line.101"></a> -<span class="sourceLineNo">102</span> LOG.error("Region " + encodedName + " opening cancelled");<a name="line.102"></a> -<span class="sourceLineNo">103</span> return;<a name="line.103"></a> -<span class="sourceLineNo">104</span> }<a name="line.104"></a> -<span class="sourceLineNo">105</span><a name="line.105"></a> -<span class="sourceLineNo">106</span> // Open region. After a successful open, failures in subsequent<a name="line.106"></a> -<span class="sourceLineNo">107</span> // processing needs to do a close as part of cleanup.<a name="line.107"></a> -<span class="sourceLineNo">108</span> region = openRegion();<a name="line.108"></a> -<span class="sourceLineNo">109</span> if (region == null) {<a name="line.109"></a> -<span class="sourceLineNo">110</span> return;<a name="line.110"></a> -<span class="sourceLineNo">111</span> }<a name="line.111"></a> -<span class="sourceLineNo">112</span><a name="line.112"></a> -<span class="sourceLineNo">113</span> if (!updateMeta(region, masterSystemTime) || this.server.isStopped() ||<a name="line.113"></a> -<span class="sourceLineNo">114</span> this.rsServices.isStopping()) {<a name="line.114"></a> -<span class="sourceLineNo">115</span> return;<a name="line.115"></a> -<span class="sourceLineNo">116</span> }<a name="line.116"></a> -<span class="sourceLineNo">117</span><a name="line.117"></a> -<span class="sourceLineNo">118</span> if (!isRegionStillOpening()) {<a name="line.118"></a> -<span class="sourceLineNo">119</span> return;<a name="line.119"></a> -<span class="sourceLineNo">120</span> }<a name="line.120"></a> -<span class="sourceLineNo">121</span><a name="line.121"></a> -<span class="sourceLineNo">122</span> // Successful region open, and add it to MutableOnlineRegions<a name="line.122"></a> -<span class="sourceLineNo">123</span> this.rsServices.addRegion(region);<a name="line.123"></a> -<span class="sourceLineNo">124</span> openSuccessful = true;<a name="line.124"></a> -<span class="sourceLineNo">125</span><a name="line.125"></a> -<span class="sourceLineNo">126</span> // Done! Successful region open<a name="line.126"></a> -<span class="sourceLineNo">127</span> LOG.debug("Opened " + regionName + " on " + 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(new RegionStateTransitionContext(<a name="line.163"></a> -<span class="sourceLineNo">164</span> TransitionCode.FAILED_OPEN, HConstants.NO_SEQNUM, -1, regionInfo));<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> /**<a name="line.168"></a> -<span class="sourceLineNo">169</span> * Update ZK or META. This can take a while if for example the<a name="line.169"></a> -<span class="sourceLineNo">170</span> * hbase:meta is not available -- if server hosting hbase:meta crashed and we are<a name="line.170"></a> -<span class="sourceLineNo">171</span> * waiting on it to come back -- so run in a thread and keep updating znode<a name="line.171"></a> -<span class="sourceLineNo">172</span> * state meantime so master doesn't timeout our region-in-transition.<a name="line.172"></a> -<span class="sourceLineNo">173</span> * Caller must cleanup region if this fails.<a name="line.173"></a> -<span class="sourceLineNo">174</span> */<a name="line.174"></a> -<span class="sourceLineNo">175</span> boolean updateMeta(final HRegion r, long masterSystemTime) {<a name="line.175"></a> -<span class="sourceLineNo">176</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.176"></a> -<span class="sourceLineNo">177</span> return false;<a name="line.177"></a> -<span class="sourceLineNo">178</span> }<a name="line.178"></a> -<span class="sourceLineNo">179</span> // Object we do wait/notify on. 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If set, we're done.<a name="line.179"></a> -<span class="sourceLineNo">180</span> // Else, wait.<a name="line.180"></a> -<span class="sourceLineNo">181</span> final AtomicBoolean signaller = new AtomicBoolean(false);<a name="line.181"></a> -<span class="sourceLineNo">182</span> PostOpenDeployTasksThread t = new PostOpenDeployTasksThread(r,<a name="line.182"></a> -<span class="sourceLineNo">183</span> this.server, this.rsServices, signaller, masterSystemTime);<a name="line.183"></a> -<span class="sourceLineNo">184</span> t.start();<a name="line.184"></a> -<span class="sourceLineNo">185</span> // Post open deploy task:<a name="line.185"></a> -<span class="sourceLineNo">186</span> // meta => update meta location in ZK<a name="line.186"></a> -<span class="sourceLineNo">187</span> // other region => update meta<a name="line.187"></a> -<span class="sourceLineNo">188</span> while (!signaller.get() && t.isAlive() && !this.server.isStopped() &&<a name="line.188"></a> -<span class="sourceLineNo">189</span> !this.rsServices.isStopping() && isRegionStillOpening()) {<a name="line.189"></a> -<span class="sourceLineNo">190</span> synchronized (signaller) {<a name="line.190"></a> -<span class="sourceLineNo">191</span> try {<a name="line.191"></a> -<span class="sourceLineNo">192</span> // Wait for 10 seconds, so that server shutdown<a name="line.192"></a> -<span class="sourceLineNo">193</span> // won't take too long if this thread happens to run.<a name="line.193"></a> -<span class="sourceLineNo">194</span> if (!signaller.get()) signaller.wait(10000);<a name="line.194"></a> -<span class="sourceLineNo">195</span> } catch (InterruptedException e) {<a name="line.195"></a> -<span class="sourceLineNo">196</span> // Go to the loop check.<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> }<a name="line.199"></a> -<span class="sourceLineNo">200</span> // Is thread still alive? 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Call {@link #getException()} after the thread finishes<a name="line.223"></a> -<span class="sourceLineNo">224</span> * to check for exceptions running {@link RegionServerServices#postOpenDeployTasks(Region)}.<a name="line.224"></a> -<span class="sourceLineNo">225</span> */<a name="line.225"></a> -<span class="sourceLineNo">226</span> static class PostOpenDeployTasksThread extends Thread {<a name="line.226"></a> -<span class="sourceLineNo">227</span> private Throwable exception = null;<a name="line.227"></a> -<span class="sourceLineNo">228</span> private final Server server;<a name="line.228"></a> -<span class="sourceLineNo">229</span> private final RegionServerServices services;<a name="line.229"></a> -<span class="sourceLineNo">230</span> private final HRegion region;<a name="line.230"></a> -<span class="sourceLineNo">231</span> private final AtomicBoolean signaller;<a name="line.231"></a> -<span class="sourceLineNo">232</span> private final long masterSystemTime;<a name="line.232"></a> -<span class="sourceLineNo">233</span><a name="line.233"></a> -<span class="sourceLineNo">234</span> PostOpenDeployTasksThread(final HRegion region, final Server server,<a name="line.234"></a> -<span class="sourceLineNo">235</span> final RegionServerServices services, final AtomicBoolean signaller, long masterSystemTime) {<a name="line.235"></a> -<span class="sourceLineNo">236</span> super("PostOpenDeployTasks:" + region.getRegionInfo().getEncodedName());<a name="line.236"></a> -<span class="sourceLineNo">237</span> this.setDaemon(true);<a name="line.237"></a> -<span class="sourceLineNo">238</span> this.server = server;<a name="line.238"></a> -<span class="sourceLineNo">239</span> this.services = services;<a name="line.239"></a> -<span class="sourceLineNo">240</span> this.region = region;<a name="line.240"></a> -<span class="sourceLineNo">241</span> this.signaller = signaller;<a name="line.241"></a> -<span class="sourceLineNo">242</span> this.masterSystemTime = masterSystemTime;<a name="line.242"></a> -<span class="sourceLineNo">243</span> }<a name="line.243"></a> -<span class="sourceLineNo">244</span><a name="line.244"></a> -<span class="sourceLineNo">245</span> @Override<a name="line.245"></a> -<span class="sourceLineNo">246</span> public void run() {<a name="line.246"></a> -<span class="sourceLineNo">247</span> try {<a name="line.247"></a> -<span class="sourceLineNo">248</span> this.services.postOpenDeployTasks(new PostOpenDeployContext(region, masterSystemTime));<a name="line.248"></a> -<span class="sourceLineNo">249</span> } catch (Throwable e) {<a name="line.249"></a> -<span class="sourceLineNo">250</span> String msg = "Exception running postOpenDeployTasks; region=" +<a name="line.250"></a> -<span class="sourceLineNo">251</span> this.region.getRegionInfo().getEncodedName();<a name="line.251"></a> -<span class="sourceLineNo">252</span> this.exception = e;<a name="line.252"></a> -<span class="sourceLineNo">253</span> if (e instanceof IOException<a name="line.253"></a> -<span class="sourceLineNo">254</span> && isRegionStillOpening(region.getRegionInfo(), services)) {<a name="line.254"></a> -<span class="sourceLineNo">255</span> server.abort(msg, e);<a name="line.255"></a> -<span class="sourceLineNo">256</span> } else {<a name="line.256"></a> -<span class="sourceLineNo">257</span> LOG.warn(msg, e);<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> // We're done. 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If that fails,<a name="line.299"></a> -<span class="sourceLineNo">300</span> // we rely on the Timeout Monitor in the master to reassign.<a name="line.300"></a> -<span class="sourceLineNo">301</span> LOG.error(<a name="line.301"></a> -<span class="sourceLineNo">302</span> "Failed open of region=" + this.regionInfo.getRegionNameAsString(), t);<a name="line.302"></a> -<span class="sourceLineNo">303</span> }<a name="line.303"></a> -<span class="sourceLineNo">304</span> return region;<a name="line.304"></a> -<span class="sourceLineNo">305</span> }<a name="line.305"></a> -<span class="sourceLineNo">306</span><a name="line.306"></a> -<span class="sourceLineNo">307</span> void cleanupFailedOpen(final HRegion region) throws IOException {<a name="line.307"></a> -<span class="sourceLineNo">308</span> if (region != null) {<a name="line.308"></a> -<span class="sourceLineNo">309</span> this.rsServices.removeRegion(region, null);<a name="line.309"></a> -<span class="sourceLineNo">310</span> region.close();<a name="line.310"></a> -<span class="sourceLineNo">311</span> }<a name="line.311"></a> -<span class="sourceLineNo">312</span> }<a name="line.312"></a> -<span class="sourceLineNo">313</span><a name="line.313"></a> -<span class="sourceLineNo">314</span> private static boolean isRegionStillOpening(<a name="line.314"></a> -<span class="sourceLineNo">315</span> RegionInfo regionInfo, RegionServerServices rsServices) {<a name="line.315"></a> -<span class="sourceLineNo">316</span> byte[] encodedName = regionInfo.getEncodedNameAsBytes();<a name="line.316"></a> -<span class="sourceLineNo">317</span> Boolean action = rsServices.getRegionsInTransitionInRS().get(encodedName);<a name="line.317"></a> -<span class="sourceLineNo">318</span> return Boolean.TRUE.equals(action); // true means opening for RIT<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> private boolean isRegionStillOpening() {<a name="line.321"></a> -<span class="sourceLineNo">322</span> return isRegionStillOpening(regionInfo, rsServices);<a name="line.322"></a> -<span class="sourceLineNo">323</span> }<a name="line.323"></a> -<span class="sourceLineNo">324</span>}<a name="line.324"></a> +<span class="sourceLineNo">044</span> * @deprecated Keep it here only for compatible<a name="line.44"></a> +<span class="sourceLineNo">045</span> * @see AssignRegionHandler<a name="line.45"></a> +<span class="sourceLineNo">046</span> */<a name="line.46"></a> +<span class="sourceLineNo">047</span>@Deprecated<a name="line.47"></a> +<span class="sourceLineNo">048</span>@InterfaceAudience.Private<a name="line.48"></a> +<span class="sourceLineNo">049</span>public class OpenRegionHandler extends EventHandler {<a name="line.49"></a> +<span class="sourceLineNo">050</span> private static final Logger LOG = LoggerFactory.getLogger(OpenRegionHandler.class);<a name="line.50"></a> +<span class="sourceLineNo">051</span><a name="line.51"></a> +<span class="sourceLineNo">052</span> protected final RegionServerServices rsServices;<a name="line.52"></a> +<span class="sourceLineNo">053</span><a name="line.53"></a> +<span class="sourceLineNo">054</span> private final RegionInfo regionInfo;<a name="line.54"></a> +<span class="sourceLineNo">055</span> private final TableDescriptor htd;<a name="line.55"></a> +<span class="sourceLineNo">056</span> private final long masterSystemTime;<a name="line.56"></a> +<span class="sourceLineNo">057</span><a name="line.57"></a> +<span class="sourceLineNo">058</span> public OpenRegionHandler(final Server server,<a name="line.58"></a> +<span class="sourceLineNo">059</span> final RegionServerServices rsServices, RegionInfo regionInfo,<a name="line.59"></a> +<span class="sourceLineNo">060</span> TableDescriptor htd, long masterSystemTime) {<a name="line.60"></a> +<span class="sourceLineNo">061</span> this(server, rsServices, regionInfo, htd, masterSystemTime, EventType.M_RS_OPEN_REGION);<a name="line.61"></a> +<span class="sourceLineNo">062</span> }<a name="line.62"></a> +<span class="sourceLineNo">063</span><a name="line.63"></a> +<span class="sourceLineNo">064</span> protected OpenRegionHandler(final Server server,<a name="line.64"></a> +<span class="sourceLineNo">065</span> final RegionServerServices rsServices, final RegionInfo regionInfo,<a name="line.65"></a> +<span class="sourceLineNo">066</span> final TableDescriptor htd, long masterSystemTime, EventType eventType) {<a name="line.66"></a> +<span class="sourceLineNo">067</span> super(server, eventType);<a name="line.67"></a> +<span class="sourceLineNo">068</span> this.rsServices = rsServices;<a name="line.68"></a> +<span class="sourceLineNo">069</span> this.regionInfo = regionInfo;<a name="line.69"></a> +<span class="sourceLineNo">070</span> this.htd = htd;<a name="line.70"></a> +<span class="sourceLineNo">071</span> this.masterSystemTime = masterSystemTime;<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> public RegionInfo getRegionInfo() {<a name="line.74"></a> +<span class="sourceLineNo">075</span> return regionInfo;<a name="line.75"></a> +<span class="sourceLineNo">076</span> }<a name="line.76"></a> +<span class="sourceLineNo">077</span><a name="line.77"></a> +<span class="sourceLineNo">078</span> @Override<a name="line.78"></a> +<span class="sourceLineNo">079</span> public void process() throws IOException {<a name="line.79"></a> +<span class="sourceLineNo">080</span> boolean openSuccessful = false;<a name="line.80"></a> +<span class="sourceLineNo">081</span> final String regionName = regionInfo.getRegionNameAsString();<a name="line.81"></a> +<span class="sourceLineNo">082</span> HRegion region = null;<a name="line.82"></a> +<span class="sourceLineNo">083</span><a name="line.83"></a> +<span class="sourceLineNo">084</span> try {<a name="line.84"></a> +<span class="sourceLineNo">085</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.85"></a> +<span class="sourceLineNo">086</span> return;<a name="line.86"></a> +<span class="sourceLineNo">087</span> }<a name="line.87"></a> +<span class="sourceLineNo">088</span> final String encodedName = regionInfo.getEncodedName();<a name="line.88"></a> +<span class="sourceLineNo">089</span><a name="line.89"></a> +<span class="sourceLineNo">090</span> // 2 different difficult situations can occur<a name="line.90"></a> +<span class="sourceLineNo">091</span> // 1) The opening was cancelled. 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" +<a name="line.97"></a> +<span class="sourceLineNo">098</span> "Marking this new attempt as failed");<a name="line.98"></a> +<span class="sourceLineNo">099</span> return;<a name="line.99"></a> +<span class="sourceLineNo">100</span> }<a name="line.100"></a> +<span class="sourceLineNo">101</span><a name="line.101"></a> +<span class="sourceLineNo">102</span> // Check that we're still supposed to open the region.<a name="line.102"></a> +<span class="sourceLineNo">103</span> // If fails, just return. Someone stole the region from under us.<a name="line.103"></a> +<span class="sourceLineNo">104</span> if (!isRegionStillOpening()){<a name="line.104"></a> +<span class="sourceLineNo">105</span> LOG.error("Region " + encodedName + " opening cancelled");<a name="line.105"></a> +<span class="sourceLineNo">106</span> return;<a name="line.106"></a> +<span class="sourceLineNo">107</span> }<a name="line.107"></a> +<span class="sourceLineNo">108</span><a name="line.108"></a> +<span class="sourceLineNo">109</span> // Open region. After a successful open, failures in subsequent<a name="line.109"></a> +<span class="sourceLineNo">110</span> // processing needs to do a close as part of cleanup.<a name="line.110"></a> +<span class="sourceLineNo">111</span> region = openRegion();<a name="line.111"></a> +<span class="sourceLineNo">112</span> if (region == null) {<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 (!updateMeta(region, masterSystemTime) || this.server.isStopped() ||<a name="line.116"></a> +<span class="sourceLineNo">117</span> this.rsServices.isStopping()) {<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> if (!isRegionStillOpening()) {<a name="line.121"></a> +<span class="sourceLineNo">122</span> return;<a name="line.122"></a> +<span class="sourceLineNo">123</span> }<a name="line.123"></a> +<span class="sourceLineNo">124</span><a name="line.124"></a> +<span class="sourceLineNo">125</span> // Successful region open, and add it to MutableOnlineRegions<a name="line.125"></a> +<span class="sourceLineNo">126</span> this.rsServices.addRegion(region);<a name="line.126"></a> +<span class="sourceLineNo">127</span> openSuccessful = true;<a name="line.127"></a> +<span class="sourceLineNo">128</span><a name="line.128"></a> +<span class="sourceLineNo">129</span> // Done! Successful region open<a name="line.129"></a> +<span class="sourceLineNo">130</span> LOG.debug("Opened " + regionName + " on " + this.server.getServerName());<a name="line.130"></a> +<span class="sourceLineNo">131</span> } finally {<a name="line.131"></a> +<span class="sourceLineNo">132</span> // Do all clean up here<a name="line.132"></a> +<span class="sourceLineNo">133</span> if (!openSuccessful) {<a name="line.133"></a> +<span class="sourceLineNo">134</span> doCleanUpOnFailedOpen(region);<a name="line.134"></a> +<span class="sourceLineNo">135</span> }<a name="line.135"></a> +<span class="sourceLineNo">136</span> final Boolean current = this.rsServices.getRegionsInTransitionInRS().<a name="line.136"></a> +<span class="sourceLineNo">137</span> remove(this.regionInfo.getEncodedNameAsBytes());<a name="line.137"></a> +<span class="sourceLineNo">138</span><a name="line.138"></a> +<span class="sourceLineNo">139</span> // Let's check if we have met a race condition on open cancellation....<a name="line.139"></a> +<span class="sourceLineNo">140</span> // A better solution would be to not have any race condition.<a name="line.140"></a> +<span class="sourceLineNo">141</span> // this.rsServices.getRegionsInTransitionInRS().remove(<a name="line.141"></a> +<span class="sourceLineNo">142</span> // this.regionInfo.getEncodedNameAsBytes(), Boolean.TRUE);<a name="line.142"></a> +<span class="sourceLineNo">143</span> // would help.<a name="line.143"></a> +<span class="sourceLineNo">144</span> if (openSuccessful) {<a name="line.144"></a> +<span class="sourceLineNo">145</span> if (current == null) { // Should NEVER happen, but let's be paranoid.<a name="line.145"></a> +<span class="sourceLineNo">146</span> LOG.error("Bad state: we've just opened a region that was NOT in transition. Region="<a name="line.146"></a> +<span class="sourceLineNo">147</span> + regionName);<a name="line.147"></a> +<span class="sourceLineNo">148</span> } else if (Boolean.FALSE.equals(current)) { // Can happen, if we're<a name="line.148"></a> +<span class="sourceLineNo">149</span> // really unlucky.<a name="line.149"></a> +<span class="sourceLineNo">150</span> LOG.error("Race condition: we've finished to open a region, while a close was requested "<a name="line.150"></a> +<span class="sourceLineNo">151</span> + " on region=" + regionName + ". It can be a critical error, as a region that"<a name="line.151"></a> +<span class="sourceLineNo">152</span> + " should be closed is now opened. Closing it now");<a name="line.152"></a> +<span class="sourceLineNo">153</span> cleanupFailedOpen(region);<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> }<a name="line.156"></a> +<span class="sourceLineNo">157</span> }<a name="line.157"></a> +<span class="sourceLineNo">158</span><a name="line.158"></a> +<span class="sourceLineNo">159</span> private void doCleanUpOnFailedOpen(HRegion region)<a name="line.159"></a> +<span class="sourceLineNo">160</span> throws IOException {<a name="line.160"></a> +<span class="sourceLineNo">161</span> try {<a name="line.161"></a> +<span class="sourceLineNo">162</span> if (region != null) {<a name="line.162"></a> +<span class="sourceLineNo">163</span> cleanupFailedOpen(region);<a name="line.163"></a> +<span class="sourceLineNo">164</span> }<a name="line.164"></a> +<span class="sourceLineNo">165</span> } finally {<a name="line.165"></a> +<span class="sourceLineNo">166</span> rsServices.reportRegionStateTransition(new RegionStateTransitionContext(<a name="line.166"></a> +<span class="sourceLineNo">167</span> TransitionCode.FAILED_OPEN, HConstants.NO_SEQNUM, -1, regionInfo));<a name="line.167"></a> +<span class="sourceLineNo">168</span> }<a name="line.168"></a> +<span class="sourceLineNo">169</span> }<a name="line.169"></a> +<span class="sourceLineNo">170</span><a name="line.170"></a> +<span class="sourceLineNo">171</span> /**<a name="line.171"></a> +<span class="sourceLineNo">172</span> * Update ZK or META. This can take a while if for example the<a name="line.172"></a> +<span class="sourceLineNo">173</span> * hbase:meta is not available -- if server hosting hbase:meta crashed and we are<a name="line.173"></a> +<span class="sourceLineNo">174</span> * waiting on it to come back -- so run in a thread and keep updating znode<a name="line.174"></a> +<span class="sourceLineNo">175</span> * state meantime so master doesn't timeout our region-in-transition.<a name="line.175"></a> +<span class="sourceLineNo">176</span> * Caller must cleanup region if this fails.<a name="line.176"></a> +<span class="sourceLineNo">177</span> */<a name="line.177"></a> +<span class="sourceLineNo">178</span> private boolean updateMeta(final HRegion r, long masterSystemTime) {<a name="line.178"></a> +<span class="sourceLineNo">179</span> if (this.server.isStopped() || this.rsServices.isStopping()) {<a name="line.179"></a> +<span class="sourceLineNo">180</span> return false;<a name="line.180"></a> +<span class="sourceLineNo">181</span> }<a name="line.181"></a> +<span class="sourceLineNo">182</span> // Object we do wait/notify on. Make it boolean. If set, we're done.<a name="line.182"></a> +<span class="sourceLineNo">183</span> // Else, wait.<a name="line.183"></a> +<span class="sourceLineNo">184</span> final AtomicBoolean signaller = new AtomicBoolean(false);<a name="line.184"></a> +<span class="sourceLineNo">185</span> PostOpenDeployTasksThread t = new PostOpenDeployTasksThread(r,<a name="line.185"></a> +<span class="sourceLineNo">186</span> this.server, this.rsServices, signaller, masterSystemTime);<a name="line.186"></a> +<span class="sourceLineNo">187</span> t.start();<a name="line.187"></a> +<span class="sourceLineNo">188</span> // Post open deploy task:<a name="line.188"></a> +<span class="sourceLineNo">189</span> // meta => update meta location in ZK<a name="line.189"></a> +<span class="sourceLineNo">190</span> // other region => update meta<a name="line.190"></a> +<span class="sourceLineNo">191</span> while (!signaller.get() && t.isAlive() && !this.server.isStopped() &&<a name="line.191"></a> +<span class="sourceLineNo">192</span> !this.rsServices.isStopping() && isRegionStillOpening()) {<a name="line.192"></a> +<span class="sourceLineNo">193</span> synchronized (signaller) {<a name="line.193"></a> +<span class="sourceLineNo">194</span> try {<a name="line.194"></a> +<span class="sourceLineNo">195</span> // Wait for 10 seconds, so that server shutdown<a name="line.195"></a> +<span class="sourceLineNo">196</span> // won't take too long if this thread happens to run.<a name="line.196"></a> +<span class="sourceLineNo">197</span> if (!signaller.get()) signaller.wait(10000);<a name="line.197"></a> +<span class="sourceLineNo">198</span> } catch (InterruptedException e) {<a name="line.198"></a> +<span class="sourceLineNo">199</span> // Go to the loop check.<a name="line.199"></a> +<span class="sourceLineNo">200</span> }<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> // Is thread still alive? We may have left above loop because server is<a name="line.203"></a> +<span class="sourceLineNo">204</span> // stopping or we timed out the edit. Is so, interrupt it.<a name="line.204"></a> +<span class="sourceLineNo">205</span> if (t.isAlive()) {<a name="line.205"></a> +<span class="sourceLineNo">206</span> if (!signaller.get()) {<a name="line.206"></a> +<span class="sourceLineNo">207</span> // Thread still running; interrupt<a name="line.207"></a> +<span class="sourceLineNo">208</span> LOG.debug("Interrupting thread " + t);<a name="line.208"></a> +<span class="sourceLineNo">209</span> t.interrupt();<a name="line.209"></a> +<span class="sourceLineNo">210</span> }<a name="line.210"></a> +<span class="sourceLineNo">211</span> try {<a name="line.211"></a> +<span class="sourceLineNo">212</span> t.join();<a name="line.212"></a> +<span class="sourceLineNo">213</span> } catch (InterruptedException ie) {<a name="line.213"></a> +<span class="sourceLineNo">214</span> LOG.warn("Interrupted joining " +<a name="line.214"></a> +<span class="sourceLineNo">215</span> r.getRegionInfo().getRegionNameAsString(), ie);<a name="line.215"></a> +<span class="sourceLineNo">216</span> Thread.currentThread().interrupt();<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><a name="line.219"></a> +<span class="sourceLineNo">220</span> // Was there an exception opening the region? This should trigger on<a name="line.220"></a> +<span class="sourceLineNo">221</span> // InterruptedException too. If so, we failed.<a name="line.221"></a> +<span class="sourceLineNo">222</span> return (!Thread.interrupted() && t.getException() == null);<a name="line.222"></a> +<span class="sourceLineNo">223</span> }<a name="line.223"></a> +<span class="sourceLineNo">224</span><a name="line.224"></a> +<span class="sourceLineNo">225</span> /**<a name="line.225"></a> +<span class="sourceLineNo">226</span> * Thread to run region post open tasks. Call {@link #getException()} after the thread finishes<a name="line.226"></a> +<span class="sourceLineNo">227</span> * to check for exceptions running {@link RegionServerServices#postOpenDeployTasks(Region)}.<a name="line.227"></a> +<span class="sourceLineNo">228</span> */<a name="line.228"></a> +<span class="sourceLineNo">229</span> static class PostOpenDeployTasksThread extends Thread {<a name="line.229"></a> +<span class="sourceLineNo">230</span> private Throwable exception = null;<a name="line.230"></a> +<span class="sourceLineNo">231</span> private final Server server;<a name="line.231"></a> +<span class="sourceLineNo">232</span> private final RegionServerServices services;<a name="line.232"></a> +<span class="sourceLineNo">233</span> private final HRegion region;<a name="line.233"></a> +<span class="sourceLineNo">234</span> private final AtomicBoolean signaller;<a name="line.234"></a> +<span class="sourceLineNo">235</span> private final long masterSystemTime;<a name="line.235"></a> +<span class="sourceLineNo">236</span><a name="line.236"></a> +<span class="sourceLineNo">237</span> PostOpenDeployTasksThread(final HRegion region, final Server server,<a name="line.237"></a> +<span class="sourceLineNo">238</span> final RegionServerServices services, final AtomicBoolean signaller, long masterSystemTime) {<a name="line.238"></a> +<span class="sourceLineNo">239</span> super("PostOpenDeployTasks:" + region.getRegionInfo().getEncodedName());<a name="line.239"></a> +<span class="sourceLineNo">240</span> this.setDaemon(true);<a name="line.240"></a> +<span class="sourceLineNo">241</span> this.server = server;<a name="line.241"></a> +<span class="sourceLineNo">242</span> this.services = services;<a name="line.242"></a> +<span class="sourceLineNo">243</span> this.region = region;<a name="line.243"></a> +<span class="sourceLineNo">244</span> this.signaller = signaller;<a name="line.244"></a> +<span class="sourceLineNo">245</span> this.masterSystemTime = masterSystemTime;<a name="line.245"></a> +<span class="sourceLineNo">246</span> }<a name="line.246"></a> +<span class="sourceLineNo">247</span><a name="line.247"></a> +<span class="sourceLineNo">248</span> @Override<a name="line.248"></a> +<span class="sourceLineNo">249</span> public void run() {<a name="line.249"></a> +<span class="sourceLineNo">250</span> try {<a name="line.250"></a> +<span class="sourceLineNo">251</span> this.services.postOpenDeployTasks(new PostOpenDeployContext(region, masterSystemTime));<a name="line.251"></a> +<span class="sourceLineNo">252</span> } catch (Throwable e) {<a name="line.252"></a> +<span class="sourceLineNo">253</span> String msg = "Exception running postOpenDeployTasks; region=" +<a name="line.253"></a> +<span class="sourceLineNo">254</span> this.region.getRegionInfo().getEncodedName();<a name="line.254"></a> +<span class="sourceLineNo">255</span> this.exception = e;<a name="line.255"></a> +<span class="sourceLineNo">256</span> if (e instanceof IOException<a name="line.256"></a> +<span class="sourceLineNo">257</span> && isRegionStillOpening(region.getRegionInfo(), services)) {<a name="line.257"></a> +<span class="sourceLineNo">258</span> server.abort(msg, e);<a name="line.258"></a> +<span class="sourceLineNo">259</span> } else {<a name="line.259"></a> +<span class="sourceLineNo">260</span> LOG.warn(msg, e);<a name="line.260"></a> +<span class="sourceLineNo">261</span> }<a name="line.261"></a> +<span class="sourceLineNo">262</span> }<a name="line.262"></a> +<span class="sourceLineNo">263</span> // We're done. Set flag then wake up anyone waiting on thread to complete.<a name="line.263"></a> +<span class="sourceLineNo">264</span> this.signaller.set(true);<a name="line.264"></a> +<span class="sourceLineNo">265</span> synchronized (this.signaller) {<a name="line.265"></a> +<span class="sourceLineNo">266</span> this.signaller.notify();<a name="line.266"></a> +<span class="sourceLineNo">267</span> }<a name="line.267"></a> +<span class="sourceLineNo">268</span> }<a name="line.268"></a> +<span class="sourceLineNo">269</span><a name="line.269"></a> +<span class="sourceLineNo">270</span> /**<a name="line.270"></a> +<span class="sourceLineNo">271</span> * @return Null or the run exception; call this method after thread is done.<a name="line.271"></a> +<span class="sourceLineNo">272</span> */<a name="line.272"></a> +<span class="sourceLineNo">273</span> Throwable getException() {<a name="line.273"></a> +<span class="sourceLineNo">274</span> return this.exception;<a name="line.274"></a> +<span class="sourceLineNo">275</span> }<a name="line.275"></a> +<span class="sourceLineNo">276</span> }<a name="line.276"></a> +<span class="sourceLineNo">277</span><a name="line.277"></a> +<span class="sourceLineNo">278</span> /**<a name="line.278"></a> +<span class="sourceLineNo">279</span> * @return Instance of HRegion if successful open else null.<a name="line.279"></a> +<span class="sourceLineNo">280</span> */<a name="line.280"></a> +<span class="sourceLineNo">281</span> private HRegion openRegion() {<a name="line.281"></a> +<span class="sourceLineNo">282</span> HRegion region = null;<a name="line.282"></a> +<span class="sourceLineNo">283</span> try {<a name="line.283"></a> +<span class="sourceLineNo">284</span> // Instantiate the region. This also periodically tickles OPENING<a name="line.284"></a> +<span class="sourceLineNo">285</span> // state so master doesn't timeout this region in transition.<a name="line.285"></a> +<span class="sourceLineNo">286</span> region = HRegion.openHRegion(this.regionInfo, this.htd,<a name="line.286"></a> +<span class="sourceLineNo">287</span> this.rsServices.getWAL(this.regionInfo),<a name="line.287"></a> +<span class="sourceLineNo">288</span> this.server.getConfiguration(),<a name="line.288"></a> +<span class="sourceLineNo">289</span> this.rsServices,<a name="line.289"></a> +<span class="sourceLineNo">290</span> new CancelableProgressable() {<a name="line.290"></a> +<span class="sourceLineNo">291</span> @Override<a name="line.291"></a> +<span class="sourceLineNo">292</span> public boolean progress() {<a name="line.292"></a> +<span class="sourceLineNo">293</span> if (!isRegionStillOpening()) {<a name="line.293"></a> +<span class="sourceLineNo">294</span> LOG.warn("Open region aborted since it isn't opening any more");<a name="line.294"></a> +<span class="sourceLineNo">295</span> return false;<a name="line.295"></a> +<span class="sourceLineNo">296</span> }<a name="line.296"></a> +<span class="sourceLineNo">297</span> return true;<a name="line.297"></a> +<span class="sourceLineNo">298</span> }<a name="line.298"></a> +<span class="sourceLineNo">299</span> });<a name="line.299"></a> +<span class="sourceLineNo">300</span> } catch (Throwable t) {<a name="line.300"></a> +<span class="sourceLineNo">301</span> // We failed open. Our caller will see the 'null' return value<a name="line.301"></a> +<span class="sourceLineNo">302</span> // and transition the node back to FAILED_OPEN. If that fails,<a name="line.302"></a> +<span class="sourceLineNo">303</span> // we rely on the Timeout Monitor in the master to reassign.<a name="line.303"></a> +<span class="sourceLineNo">304</span> LOG.error(<a name="line.304"></a> +<span class="sourceLineNo">305</span> "Failed open of region=" + this.regionInfo.getRegionNameAsString(), t);<a name="line.305"></a> +<span class="sourceLineNo">306</span> }<a name="line.306"></a> +<span class="sourceLineNo">307</span> return region;<a name="line.307"></a> +<span class="sourceLineNo">308</span> }<a name="line.308"></a> +<span class="sourceLineNo">309</span><a name="line.309"></a> +<span class="sourceLineNo">310</span> private void cleanupFailedOpen(final HRegion region) throws IOException {<a name="line.310"></a> +<span class="sourceLineNo">311</span> if (region != null) {<a name="line.311"></a> +<span class="sourceLineNo">312</span> this.rsServices.removeRegion(region, null);<a name="line.312"></a> +<span class="sourceLineNo">313</span> region.close();<a name="line.313"></a> +<span class="sourceLineNo">314</span> }<a name="line.314"></a> +<span class="sourceLineNo">315</span> }<a name="line.315"></a> +<span class="sourceLineNo">316</span><a name="line.316"></a> +<span class="sourceLineNo">317</span> private static boolean isRegionStillOpening(<a name="line.317"></a> +<span class="sourceLineNo">318</span> RegionInfo regionInfo, RegionServerServices rsServices) {<a name="line.318"></a> +<span class="sourceLineNo">319</span> byte[] encodedName = regionInfo.getEncodedNameAsBytes();<a name="line.319"></a> +<span class="sourceLineNo">320</span> Boolean action = rsServices.getRegionsInTransitionInRS().get(encodedName);<a name="line.320"></a> +<span class="sourceLineNo">321</span> return Boolean.TRUE.equals(action); // true means opening for RIT<a name="line.321"></a> +<span class="sourceLineNo">322</span> }<a name="line.322"></a> +<span class="sourceLineNo">323</span><a name="line.323"></a> +<span class="sourceLineNo">324</span> private boolean isRegionStillOpening() {<a name="line.324"></a> +<span class="sourceLineNo">325</span> return isRegionStillOpening(regionInfo, rsServices);<a name="line.325"></a> +<span class="sourceLineNo">326</span> }<a name="line.326"></a> +<span class="sourceLineNo">327</span>}<a name="line.327"></a>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/f6f9d4f3/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/UnassignRegionHandler.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/UnassignRegionHandler.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/UnassignRegionHandler.html new file mode 100644 index 0000000..59ae4f2 --- /dev/null +++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/handler/UnassignRegionHandler.html @@ -0,0 +1,211 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";> +<html lang="en"> +<head> +<title>Source code</title> +<link rel="stylesheet" type="text/css" href="../../../../../../../stylesheet.css" title="Style"> +</head> +<body> +<div class="sourceContainer"> +<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> +<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> +<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> +<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> +<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> +<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> +<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> +<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> +<span class="sourceLineNo">009</span> *<a name="line.9"></a> +<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> +<span class="sourceLineNo">011</span> *<a name="line.11"></a> +<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> +<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> +<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> +<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> +<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> +<span class="sourceLineNo">017</span> */<a name="line.17"></a> +<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.regionserver.handler;<a name="line.18"></a> +<span class="sourceLineNo">019</span><a name="line.19"></a> +<span class="sourceLineNo">020</span>import edu.umd.cs.findbugs.annotations.Nullable;<a name="line.20"></a> +<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a> +<span class="sourceLineNo">022</span>import java.util.concurrent.TimeUnit;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.HConstants;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.ServerName;<a name="line.24"></a> +<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.executor.EventHandler;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.executor.EventType;<a name="line.26"></a> +<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.regionserver.HRegion;<a name="line.27"></a> +<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.regionserver.Region;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.regionserver.RegionServerServices;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.regionserver.RegionServerServices.RegionStateTransitionContext;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.32"></a> +<span class="sourceLineNo">033</span>import org.slf4j.Logger;<a name="line.33"></a> +<span class="sourceLineNo">034</span>import org.slf4j.LoggerFactory;<a name="line.34"></a> +<span class="sourceLineNo">035</span><a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;<a name="line.36"></a> +<span class="sourceLineNo">037</span><a name="line.37"></a> +<span class="sourceLineNo">038</span>/**<a name="line.38"></a> +<span class="sourceLineNo">039</span> * Handles closing 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> * Just done the same thing with the old {@link CloseRegionHandler}, with some modifications on<a name="line.41"></a> +<span class="sourceLineNo">042</span> * fencing and retrying. But we need to keep the {@link CloseRegionHandler} as is to keep compatible<a name="line.42"></a> +<span class="sourceLineNo">043</span> * with the zk less assignment for 1.x, otherwise it is not possible to do rolling upgrade.<a name="line.43"></a> +<span class="sourceLineNo">044</span> */<a name="line.44"></a> +<span class="sourceLineNo">045</span>@InterfaceAudience.Private<a name="line.45"></a> +<span class="sourceLineNo">046</span>public class UnassignRegionHandler extends EventHandler {<a name="line.46"></a> +<span class="sourceLineNo">047</span><a name="line.47"></a> +<span class="sourceLineNo">048</span> private static final Logger LOG = LoggerFactory.getLogger(UnassignRegionHandler.class);<a name="line.48"></a> +<span class="sourceLineNo">049</span><a name="line.49"></a> +<span class="sourceLineNo">050</span> private final String encodedName;<a name="line.50"></a> +<span class="sourceLineNo">051</span> // If true, the hosting server is aborting. Region close process is different<a name="line.51"></a> +<span class="sourceLineNo">052</span> // when we are aborting.<a name="line.52"></a> +<span class="sourceLineNo">053</span> private final boolean abort;<a name="line.53"></a> +<span class="sourceLineNo">054</span><a name="line.54"></a> +<span class="sourceLineNo">055</span> private final ServerName destination;<a name="line.55"></a> +<span class="sourceLineNo">056</span><a name="line.56"></a> +<span class="sourceLineNo">057</span> public UnassignRegionHandler(RegionServerServices server, String encodedName, boolean abort,<a name="line.57"></a> +<span class="sourceLineNo">058</span> @Nullable ServerName destination, EventType eventType) {<a name="line.58"></a> +<span class="sourceLineNo">059</span> super(server, eventType);<a name="line.59"></a> +<span class="sourceLineNo">060</span> this.encodedName = encodedName;<a name="line.60"></a> +<span class="sourceLineNo">061</span> this.abort = abort;<a name="line.61"></a> +<span class="sourceLineNo">062</span> this.destination = destination;<a name="line.62"></a> +<span class="sourceLineNo">063</span> }<a name="line.63"></a> +<span class="sourceLineNo">064</span><a name="line.64"></a> +<span class="sourceLineNo">065</span> private RegionServerServices getServer() {<a name="line.65"></a> +<span class="sourceLineNo">066</span> return (RegionServerServices) server;<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> @Override<a name="line.69"></a> +<span class="sourceLineNo">070</span> public void process() throws IOException {<a name="line.70"></a> +<span class="sourceLineNo">071</span> RegionServerServices rs = getServer();<a name="line.71"></a> +<span class="sourceLineNo">072</span> byte[] encodedNameBytes = Bytes.toBytes(encodedName);<a name="line.72"></a> +<span class="sourceLineNo">073</span> Boolean previous = rs.getRegionsInTransitionInRS().putIfAbsent(encodedNameBytes, Boolean.FALSE);<a name="line.73"></a> +<span class="sourceLineNo">074</span> if (previous != null) {<a name="line.74"></a> +<span class="sourceLineNo">075</span> if (previous) {<a name="line.75"></a> +<span class="sourceLineNo">076</span> // This could happen as we will update the region state to OPEN when calling<a name="line.76"></a> +<span class="sourceLineNo">077</span> // reportRegionStateTransition, so the HMaster will think the region is online, before we<a name="line.77"></a> +<span class="sourceLineNo">078</span> // actually open the region, as reportRegionStateTransition is part of the opening process.<a name="line.78"></a> +<span class="sourceLineNo">079</span> LOG.warn("Received CLOSE for the region: {}, which we are already " +<a name="line.79"></a> +<span class="sourceLineNo">080</span> "trying to OPEN. try again later.", encodedName);<a name="line.80"></a> +<span class="sourceLineNo">081</span> // TODO: backoff<a name="line.81"></a> +<span class="sourceLineNo">082</span> rs.getExecutorService().delayedSubmit(this, 1, TimeUnit.SECONDS);<a name="line.82"></a> +<span class="sourceLineNo">083</span> } else {<a name="line.83"></a> +<span class="sourceLineNo">084</span> LOG.info("Received CLOSE for the region: {}, which we are already trying to CLOSE," +<a name="line.84"></a> +<span class="sourceLineNo">085</span> " but not completed yet", encodedName);<a name="line.85"></a> +<span class="sourceLineNo">086</span> }<a name="line.86"></a> +<span class="sourceLineNo">087</span> return;<a name="line.87"></a> +<span class="sourceLineNo">088</span> }<a name="line.88"></a> +<span class="sourceLineNo">089</span> HRegion region = (HRegion) rs.getRegion(encodedName);<a name="line.89"></a> +<span class="sourceLineNo">090</span> if (region == null) {<a name="line.90"></a> +<span class="sourceLineNo">091</span> LOG.debug(<a name="line.91"></a> +<span class="sourceLineNo">092</span> "Received CLOSE for a region {} which is not online, and we're not opening/closing.",<a name="line.92"></a> +<span class="sourceLineNo">093</span> encodedName);<a name="line.93"></a> +<span class="sourceLineNo">094</span> rs.getRegionsInTransitionInRS().remove(encodedNameBytes, Boolean.FALSE);<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> String regionName = region.getRegionInfo().getEncodedName();<a name="line.97"></a> +<span class="sourceLineNo">098</span> LOG.info("Close {}", regionName);<a name="line.98"></a> +<span class="sourceLineNo">099</span> if (region.getCoprocessorHost() != null) {<a name="line.99"></a> +<span class="sourceLineNo">100</span> // XXX: The behavior is a bit broken. At master side there is no FAILED_CLOSE state, so if<a name="line.100"></a> +<span class="sourceLineNo">101</span> // there are exception thrown from the CP, we can not report the error to master, and if here<a name="line.101"></a> +<span class="sourceLineNo">102</span> // we just return without calling reportRegionStateTransition, the TRSP at master side will<a name="line.102"></a> +<span class="sourceLineNo">103</span> // hang there for ever. So here if the CP throws an exception out, the only way is to abort<a name="line.103"></a> +<span class="sourceLineNo">104</span> // the RS...<a name="line.104"></a> +<span class="sourceLineNo">105</span> region.getCoprocessorHost().preClose(abort);<a name="line.105"></a> +<span class="sourceLineNo">106</span> }<a name="line.106"></a> +<span class="sourceLineNo">107</span> if (region.close(abort) == null) {<a name="line.107"></a> +<span class="sourceLineNo">108</span> // XXX: Is this still possible? The old comment says about split, but now split is done at<a name="line.108"></a> +<span class="sourceLineNo">109</span> // master side, so...<a name="line.109"></a> +<span class="sourceLineNo">110</span> LOG.warn("Can't close region {}, was already closed during close()", regionName);<a name="line.110"></a> +<span class="sourceLineNo">111</span> rs.getRegionsInTransitionInRS().remove(encodedNameBytes, Boolean.FALSE);<a name="line.111"></a> +<span class="sourceLineNo">112</span> return;<a name="line.112"></a> +<span class="sourceLineNo">113</span> }<a name="line.113"></a> +<span class="sourceLineNo">114</span> rs.removeRegion(region, destination);<a name="line.114"></a> +<span class="sourceLineNo">115</span> if (!rs.reportRegionStateTransition(new RegionStateTransitionContext(TransitionCode.CLOSED,<a name="line.115"></a> +<span class="sourceLineNo">116</span> HConstants.NO_SEQNUM, -1, region.getRegionInfo()))) {<a name="line.116"></a> +<span class="sourceLineNo">117</span> throw new IOException("Failed to report close to master: " + regionName);<a name="line.117"></a> +<span class="sourceLineNo">118</span> }<a name="line.118"></a> +<span class="sourceLineNo">119</span> rs.getRegionsInTransitionInRS().remove(encodedNameBytes, Boolean.FALSE);<a name="line.119"></a> +<span class="sourceLineNo">120</span> LOG.info("Closed {}", regionName);<a name="line.120"></a> +<span class="sourceLineNo">121</span> }<a name="line.121"></a> +<span class="sourceLineNo">122</span><a name="line.122"></a> +<span class="sourceLineNo">123</span> @Override<a name="line.123"></a> +<span class="sourceLineNo">124</span> protected void handleException(Throwable t) {<a name="line.124"></a> +<span class="sourceLineNo">125</span> LOG.warn("Fatal error occured while closing region {}, aborting...", encodedName, t);<a name="line.125"></a> +<span class="sourceLineNo">126</span> getServer().abort("Failed to close region " + encodedName + " and can not recover", t);<a name="line.126"></a> +<span class="sourceLineNo">127</span> }<a name="line.127"></a> +<span class="sourceLineNo">128</span><a name="line.128"></a> +<span class="sourceLineNo">129</span> public static UnassignRegionHandler create(RegionServerServices server, String encodedName,<a name="line.129"></a> +<span class="sourceLineNo">130</span> boolean abort, @Nullable ServerName destination) {<a name="line.130"></a> +<span class="sourceLineNo">131</span> // Just try our best to determine whether it is for closing meta. It is not the end of the world<a name="line.131"></a> +<span class="sourceLineNo">132</span> // if we put the handler into a wrong executor.<a name="line.132"></a> +<span class="sourceLineNo">133</span> Region region = server.getRegion(encodedName);<a name="line.133"></a> +<span class="sourceLineNo">134</span> EventType eventType =<a name="line.134"></a> +<span class="sourceLineNo">135</span> region != null && region.getRegionInfo().isMetaRegion() ? EventType.M_RS_CLOSE_META<a name="line.135"></a> +<span class="sourceLineNo">136</span> : EventType.M_RS_CLOSE_REGION;<a name="line.136"></a> +<span class="sourceLineNo">137</span> return new UnassignRegionHandler(server, encodedName, abort, destination, eventType);<a name="line.137"></a> +<span class="sourceLineNo">138</span> }<a name="line.138"></a> +<span class="sourceLineNo">139</span>}<a name="line.139"></a> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +</pre> +</div> +</body> +</html>
