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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.master;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><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.List;<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.client.RegionInfo;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.client.RegionInfoBuilder;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.client.RegionReplicaUtil;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.master.assignment.AssignmentManager;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.zookeeper.ZKWatcher;<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.apache.zookeeper.KeeperException;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.slf4j.Logger;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.slf4j.LoggerFactory;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span>/**<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * Used by the HMaster on startup to split meta logs and assign the meta table.<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> */<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>@InterfaceAudience.Private<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>class MasterMetaBootstrap {<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> private static final Logger LOG = LoggerFactory.getLogger(MasterMetaBootstrap.class);<a name="line.42"></a> |
| <span class="sourceLineNo">043</span><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> private final HMaster master;<a name="line.44"></a> |
| <span class="sourceLineNo">045</span><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> public MasterMetaBootstrap(HMaster master) {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> this.master = master;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> }<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> /**<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> * For assigning hbase:meta replicas only.<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * TODO: The way this assign runs, nothing but chance to stop all replicas showing up on same<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * server as the hbase:meta region.<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> */<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> void assignMetaReplicas()<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> throws IOException, InterruptedException, KeeperException {<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> int numReplicas = master.getConfiguration().getInt(HConstants.META_REPLICAS_NUM,<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> HConstants.DEFAULT_META_REPLICA_NUM);<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> final AssignmentManager assignmentManager = master.getAssignmentManager();<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> if (!assignmentManager.isMetaLoaded()) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> throw new IllegalStateException("hbase:meta must be initialized first before we can " +<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> "assign out its replicas");<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> }<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> ServerName metaServername = MetaTableLocator.getMetaRegionLocation(this.master.getZooKeeper());<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> for (int i = 1; i < numReplicas; i++) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> // Get current meta state for replica from zk.<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> RegionState metaState = MetaTableLocator.getMetaRegionState(master.getZooKeeper(), i);<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> RegionInfo hri = RegionReplicaUtil.getRegionInfoForReplica(<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> RegionInfoBuilder.FIRST_META_REGIONINFO, i);<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> LOG.debug(hri.getRegionNameAsString() + " replica region state from zookeeper=" + metaState);<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> if (metaServername.equals(metaState.getServerName())) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> metaState = null;<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> LOG.info(hri.getRegionNameAsString() +<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> " old location is same as current hbase:meta location; setting location as null...");<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> }<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> // These assigns run inline. All is blocked till they complete. Only interrupt is shutting<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> // down hosting server which calls AM#stop.<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> if (metaState != null && metaState.getServerName() != null) {<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> // Try to retain old assignment.<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> assignmentManager.assignAsync(hri, metaState.getServerName());<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> } else {<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> assignmentManager.assignAsync(hri);<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> }<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> unassignExcessMetaReplica(numReplicas);<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> }<a name="line.86"></a> |
| <span class="sourceLineNo">087</span><a name="line.87"></a> |
| <span class="sourceLineNo">088</span> private void unassignExcessMetaReplica(int numMetaReplicasConfigured) {<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> final ZKWatcher zooKeeper = master.getZooKeeper();<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> // unassign the unneeded replicas (for e.g., if the previous master was configured<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> // with a replication of 3 and now it is 2, we need to unassign the 1 unneeded replica)<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> try {<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> List<String> metaReplicaZnodes = zooKeeper.getMetaReplicaNodes();<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> for (String metaReplicaZnode : metaReplicaZnodes) {<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> int replicaId = zooKeeper.getZNodePaths().getMetaReplicaIdFromZnode(metaReplicaZnode);<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> if (replicaId >= numMetaReplicasConfigured) {<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> RegionState r = MetaTableLocator.getMetaRegionState(zooKeeper, replicaId);<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> LOG.info("Closing excess replica of meta region " + r.getRegion());<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> // send a close and wait for a max of 30 seconds<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> ServerManager.closeRegionSilentlyAndWait(master.getAsyncClusterConnection(),<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> r.getServerName(), r.getRegion(), 30000);<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> ZKUtil.deleteNode(zooKeeper, zooKeeper.getZNodePaths().getZNodeForReplica(replicaId));<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> } catch (Exception ex) {<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> // ignore the exception since we don't want the master to be wedged due to potential<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> // issues in the cleanup of the extra regions. We can do that cleanup via hbck or manually<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> LOG.warn("Ignoring exception " + ex);<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>}<a name="line.111"></a> |
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