http://git-wip-us.apache.org/repos/asf/hbase-site/blob/621486f3/devapidocs/src-html/org/apache/hadoop/hbase/master/MasterMetaBootstrap.html
----------------------------------------------------------------------
diff --git
a/devapidocs/src-html/org/apache/hadoop/hbase/master/MasterMetaBootstrap.html
b/devapidocs/src-html/org/apache/hadoop/hbase/master/MasterMetaBootstrap.html
index 5b68f6f..e73540e 100644
---
a/devapidocs/src-html/org/apache/hadoop/hbase/master/MasterMetaBootstrap.html
+++
b/devapidocs/src-html/org/apache/hadoop/hbase/master/MasterMetaBootstrap.html
@@ -29,143 +29,134 @@
<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 java.util.Set;<a
name="line.23"></a>
-<span class="sourceLineNo">024</span><a name="line.24"></a>
-<span class="sourceLineNo">025</span>import
org.apache.hadoop.hbase.HConstants;<a name="line.25"></a>
-<span class="sourceLineNo">026</span>import
org.apache.hadoop.hbase.ServerName;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import
org.apache.hadoop.hbase.client.RegionInfo;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import
org.apache.hadoop.hbase.client.RegionInfoBuilder;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import
org.apache.hadoop.hbase.client.RegionReplicaUtil;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import
org.apache.hadoop.hbase.master.assignment.AssignmentManager;<a
name="line.30"></a>
-<span class="sourceLineNo">031</span>import
org.apache.hadoop.hbase.monitoring.MonitoredTask;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import
org.apache.hadoop.hbase.zookeeper.MetaTableLocator;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import
org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import
org.apache.hadoop.hbase.zookeeper.ZKWatcher;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import
org.apache.yetus.audience.InterfaceAudience;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import
org.apache.zookeeper.KeeperException;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.slf4j.Logger;<a
name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.slf4j.LoggerFactory;<a
name="line.38"></a>
-<span class="sourceLineNo">039</span><a name="line.39"></a>
-<span class="sourceLineNo">040</span>/**<a name="line.40"></a>
-<span class="sourceLineNo">041</span> * Used by the HMaster on startup to
split meta logs and assign the meta table.<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 MasterMetaBootstrap {<a
name="line.44"></a>
-<span class="sourceLineNo">045</span> private static final Logger LOG =
LoggerFactory.getLogger(MasterMetaBootstrap.class);<a name="line.45"></a>
+<span class="sourceLineNo">024</span>import
org.apache.hadoop.hbase.HConstants;<a name="line.24"></a>
+<span class="sourceLineNo">025</span>import
org.apache.hadoop.hbase.ServerName;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import
org.apache.hadoop.hbase.client.RegionInfo;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import
org.apache.hadoop.hbase.client.RegionInfoBuilder;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import
org.apache.hadoop.hbase.client.RegionReplicaUtil;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import
org.apache.hadoop.hbase.master.assignment.AssignmentManager;<a
name="line.29"></a>
+<span class="sourceLineNo">030</span>import
org.apache.hadoop.hbase.zookeeper.MetaTableLocator;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import
org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import
org.apache.hadoop.hbase.zookeeper.ZKWatcher;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import
org.apache.yetus.audience.InterfaceAudience;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import
org.apache.zookeeper.KeeperException;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.slf4j.Logger;<a
name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.slf4j.LoggerFactory;<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> * Used by the HMaster on startup to
split meta logs and assign the meta table.<a name="line.39"></a>
+<span class="sourceLineNo">040</span> */<a name="line.40"></a>
+<span class="sourceLineNo">041</span>@InterfaceAudience.Private<a
name="line.41"></a>
+<span class="sourceLineNo">042</span>public class MasterMetaBootstrap {<a
name="line.42"></a>
+<span class="sourceLineNo">043</span> private static final Logger LOG =
LoggerFactory.getLogger(MasterMetaBootstrap.class);<a name="line.43"></a>
+<span class="sourceLineNo">044</span><a name="line.44"></a>
+<span class="sourceLineNo">045</span> private final HMaster master;<a
name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
-<span class="sourceLineNo">047</span> private final MonitoredTask status;<a
name="line.47"></a>
-<span class="sourceLineNo">048</span> private final HMaster master;<a
name="line.48"></a>
-<span class="sourceLineNo">049</span><a name="line.49"></a>
-<span class="sourceLineNo">050</span> public MasterMetaBootstrap(final
HMaster master, final MonitoredTask status) {<a name="line.50"></a>
-<span class="sourceLineNo">051</span> this.master = master;<a
name="line.51"></a>
-<span class="sourceLineNo">052</span> this.status = status;<a
name="line.52"></a>
-<span class="sourceLineNo">053</span> }<a name="line.53"></a>
-<span class="sourceLineNo">054</span><a name="line.54"></a>
-<span class="sourceLineNo">055</span> public void recoverMeta() throws
InterruptedException, IOException {<a name="line.55"></a>
-<span class="sourceLineNo">056</span> // This is a blocking call that waits
until hbase:meta is deployed.<a name="line.56"></a>
-<span class="sourceLineNo">057</span> master.recoverMeta();<a
name="line.57"></a>
-<span class="sourceLineNo">058</span> // Now we can start the
TableStateManager. It is backed by hbase:meta.<a name="line.58"></a>
-<span class="sourceLineNo">059</span>
master.getTableStateManager().start();<a name="line.59"></a>
-<span class="sourceLineNo">060</span> // Enable server crash procedure
handling<a name="line.60"></a>
-<span class="sourceLineNo">061</span>
enableCrashedServerProcessing(false);<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> public void processDeadServers() {<a
name="line.64"></a>
-<span class="sourceLineNo">065</span> // get a list for previously failed
RS which need log splitting work<a name="line.65"></a>
-<span class="sourceLineNo">066</span> // we recover hbase:meta region
servers inside master initialization and<a name="line.66"></a>
-<span class="sourceLineNo">067</span> // handle other failed servers in SSH
in order to start up master node ASAP<a name="line.67"></a>
-<span class="sourceLineNo">068</span> Set<ServerName>
previouslyFailedServers =<a name="line.68"></a>
-<span class="sourceLineNo">069</span>
master.getMasterWalManager().getFailedServersFromLogFolders();<a
name="line.69"></a>
-<span class="sourceLineNo">070</span><a name="line.70"></a>
-<span class="sourceLineNo">071</span> // Master has recovered hbase:meta
region server and we put<a name="line.71"></a>
-<span class="sourceLineNo">072</span> // other failed region servers in a
queue to be handled later by SSH<a name="line.72"></a>
-<span class="sourceLineNo">073</span> for (ServerName tmpServer :
previouslyFailedServers) {<a name="line.73"></a>
-<span class="sourceLineNo">074</span>
master.getServerManager().processDeadServer(tmpServer, true);<a
name="line.74"></a>
-<span class="sourceLineNo">075</span> }<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> /**<a name="line.78"></a>
-<span class="sourceLineNo">079</span> * For assigning hbase:meta replicas
only.<a name="line.79"></a>
-<span class="sourceLineNo">080</span> * TODO: The way this assign runs,
nothing but chance to stop all replicas showing up on same<a name="line.80"></a>
-<span class="sourceLineNo">081</span> * server as the hbase:meta region.<a
name="line.81"></a>
-<span class="sourceLineNo">082</span> */<a name="line.82"></a>
-<span class="sourceLineNo">083</span> protected void assignMetaReplicas()<a
name="line.83"></a>
-<span class="sourceLineNo">084</span> throws IOException,
InterruptedException, KeeperException {<a name="line.84"></a>
-<span class="sourceLineNo">085</span> int numReplicas =
master.getConfiguration().getInt(HConstants.META_REPLICAS_NUM,<a
name="line.85"></a>
-<span class="sourceLineNo">086</span>
HConstants.DEFAULT_META_REPLICA_NUM);<a name="line.86"></a>
-<span class="sourceLineNo">087</span> if (numReplicas <= 1) {<a
name="line.87"></a>
-<span class="sourceLineNo">088</span> // No replicaas to assign.
Return.<a name="line.88"></a>
-<span class="sourceLineNo">089</span> return;<a name="line.89"></a>
-<span class="sourceLineNo">090</span> }<a name="line.90"></a>
-<span class="sourceLineNo">091</span> final AssignmentManager
assignmentManager = master.getAssignmentManager();<a name="line.91"></a>
-<span class="sourceLineNo">092</span> if
(!assignmentManager.isMetaInitialized()) {<a name="line.92"></a>
-<span class="sourceLineNo">093</span> throw new
IllegalStateException("hbase:meta must be initialized first before we can " +<a
name="line.93"></a>
-<span class="sourceLineNo">094</span> "assign out its replicas");<a
name="line.94"></a>
-<span class="sourceLineNo">095</span> }<a name="line.95"></a>
-<span class="sourceLineNo">096</span> ServerName metaServername =<a
name="line.96"></a>
-<span class="sourceLineNo">097</span>
this.master.getMetaTableLocator().getMetaRegionLocation(this.master.getZooKeeper());<a
name="line.97"></a>
-<span class="sourceLineNo">098</span> for (int i = 1; i < numReplicas;
i++) {<a name="line.98"></a>
-<span class="sourceLineNo">099</span> // Get current meta state for
replica from zk.<a name="line.99"></a>
-<span class="sourceLineNo">100</span> RegionState metaState =
MetaTableLocator.getMetaRegionState(master.getZooKeeper(), i);<a
name="line.100"></a>
-<span class="sourceLineNo">101</span> RegionInfo hri =
RegionReplicaUtil.getRegionInfoForReplica(<a name="line.101"></a>
-<span class="sourceLineNo">102</span>
RegionInfoBuilder.FIRST_META_REGIONINFO, i);<a name="line.102"></a>
-<span class="sourceLineNo">103</span>
LOG.debug(hri.getRegionNameAsString() + " replica region state from zookeeper="
+ metaState);<a name="line.103"></a>
-<span class="sourceLineNo">104</span> if
(metaServername.equals(metaState.getServerName())) {<a name="line.104"></a>
-<span class="sourceLineNo">105</span> metaState = null;<a
name="line.105"></a>
-<span class="sourceLineNo">106</span>
LOG.info(hri.getRegionNameAsString() +<a name="line.106"></a>
-<span class="sourceLineNo">107</span> " old location is same as
current hbase:meta location; setting location as null...");<a
name="line.107"></a>
-<span class="sourceLineNo">108</span> }<a name="line.108"></a>
-<span class="sourceLineNo">109</span> // These assigns run inline. All is
blocked till they complete. Only interrupt is shutting<a name="line.109"></a>
-<span class="sourceLineNo">110</span> // down hosting server which calls
AM#stop.<a name="line.110"></a>
-<span class="sourceLineNo">111</span> if (metaState != null &&
metaState.getServerName() != null) {<a name="line.111"></a>
-<span class="sourceLineNo">112</span> // Try to retain old
assignment.<a name="line.112"></a>
-<span class="sourceLineNo">113</span> assignmentManager.assign(hri,
metaState.getServerName());<a name="line.113"></a>
-<span class="sourceLineNo">114</span> } else {<a name="line.114"></a>
-<span class="sourceLineNo">115</span> assignmentManager.assign(hri);<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>
unassignExcessMetaReplica(numReplicas);<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> private void
unassignExcessMetaReplica(int numMetaReplicasConfigured) {<a
name="line.121"></a>
-<span class="sourceLineNo">122</span> final ZKWatcher zooKeeper =
master.getZooKeeper();<a name="line.122"></a>
-<span class="sourceLineNo">123</span> // unassign the unneeded replicas
(for e.g., if the previous master was configured<a name="line.123"></a>
-<span class="sourceLineNo">124</span> // with a replication of 3 and now it
is 2, we need to unassign the 1 unneeded replica)<a name="line.124"></a>
-<span class="sourceLineNo">125</span> try {<a name="line.125"></a>
-<span class="sourceLineNo">126</span> List<String>
metaReplicaZnodes = zooKeeper.getMetaReplicaNodes();<a name="line.126"></a>
-<span class="sourceLineNo">127</span> for (String metaReplicaZnode :
metaReplicaZnodes) {<a name="line.127"></a>
-<span class="sourceLineNo">128</span> int replicaId =
zooKeeper.getZNodePaths().getMetaReplicaIdFromZnode(metaReplicaZnode);<a
name="line.128"></a>
-<span class="sourceLineNo">129</span> if (replicaId >=
numMetaReplicasConfigured) {<a name="line.129"></a>
-<span class="sourceLineNo">130</span> RegionState r =
MetaTableLocator.getMetaRegionState(zooKeeper, replicaId);<a
name="line.130"></a>
-<span class="sourceLineNo">131</span> LOG.info("Closing excess
replica of meta region " + r.getRegion());<a name="line.131"></a>
-<span class="sourceLineNo">132</span> // send a close and wait for a
max of 30 seconds<a name="line.132"></a>
-<span class="sourceLineNo">133</span>
ServerManager.closeRegionSilentlyAndWait(master.getClusterConnection(),<a
name="line.133"></a>
-<span class="sourceLineNo">134</span> r.getServerName(),
r.getRegion(), 30000);<a name="line.134"></a>
-<span class="sourceLineNo">135</span> ZKUtil.deleteNode(zooKeeper,
zooKeeper.getZNodePaths().getZNodeForReplica(replicaId));<a name="line.135"></a>
-<span class="sourceLineNo">136</span> }<a name="line.136"></a>
-<span class="sourceLineNo">137</span> }<a name="line.137"></a>
-<span class="sourceLineNo">138</span> } catch (Exception ex) {<a
name="line.138"></a>
-<span class="sourceLineNo">139</span> // ignore the exception since we
don't want the master to be wedged due to potential<a name="line.139"></a>
-<span class="sourceLineNo">140</span> // issues in the cleanup of the
extra regions. We can do that cleanup via hbck or manually<a
name="line.140"></a>
-<span class="sourceLineNo">141</span> LOG.warn("Ignoring exception " +
ex);<a name="line.141"></a>
-<span class="sourceLineNo">142</span> }<a name="line.142"></a>
-<span class="sourceLineNo">143</span> }<a name="line.143"></a>
-<span class="sourceLineNo">144</span><a name="line.144"></a>
-<span class="sourceLineNo">145</span> private void
enableCrashedServerProcessing(final boolean waitForMeta)<a name="line.145"></a>
-<span class="sourceLineNo">146</span> throws InterruptedException {<a
name="line.146"></a>
-<span class="sourceLineNo">147</span> // If crashed server processing is
disabled, we enable it and expire those dead but not expired<a
name="line.147"></a>
-<span class="sourceLineNo">148</span> // servers. This is required so that
if meta is assigning to a server which dies after<a name="line.148"></a>
-<span class="sourceLineNo">149</span> // assignMeta starts assignment,
ServerCrashProcedure can re-assign it. Otherwise, we will be<a
name="line.149"></a>
-<span class="sourceLineNo">150</span> // stuck here waiting forever if
waitForMeta is specified.<a name="line.150"></a>
-<span class="sourceLineNo">151</span> if
(!master.isServerCrashProcessingEnabled()) {<a name="line.151"></a>
-<span class="sourceLineNo">152</span>
master.setServerCrashProcessingEnabled(true);<a name="line.152"></a>
-<span class="sourceLineNo">153</span>
master.getServerManager().processQueuedDeadServers();<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> if (waitForMeta) {<a
name="line.156"></a>
-<span class="sourceLineNo">157</span>
master.getMetaTableLocator().waitMetaRegionLocation(master.getZooKeeper());<a
name="line.157"></a>
-<span class="sourceLineNo">158</span> }<a name="line.158"></a>
-<span class="sourceLineNo">159</span> }<a name="line.159"></a>
-<span class="sourceLineNo">160</span>}<a name="line.160"></a>
+<span class="sourceLineNo">047</span> public MasterMetaBootstrap(HMaster
master) {<a name="line.47"></a>
+<span class="sourceLineNo">048</span> this.master = master;<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> public void recoverMeta() throws
InterruptedException, IOException {<a name="line.51"></a>
+<span class="sourceLineNo">052</span> // This is a blocking call that waits
until hbase:meta is deployed.<a name="line.52"></a>
+<span class="sourceLineNo">053</span> master.recoverMeta();<a
name="line.53"></a>
+<span class="sourceLineNo">054</span> // Now we can start the
TableStateManager. It is backed by hbase:meta.<a name="line.54"></a>
+<span class="sourceLineNo">055</span>
master.getTableStateManager().start();<a name="line.55"></a>
+<span class="sourceLineNo">056</span> // Enable server crash procedure
handling<a name="line.56"></a>
+<span class="sourceLineNo">057</span> enableCrashedServerProcessing();<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> public void processDeadServers() {<a
name="line.60"></a>
+<span class="sourceLineNo">061</span> // get a list for previously failed
RS which need log splitting work<a name="line.61"></a>
+<span class="sourceLineNo">062</span> // we recover hbase:meta region
servers inside master initialization and<a name="line.62"></a>
+<span class="sourceLineNo">063</span> // handle other failed servers in SSH
in order to start up master node ASAP<a name="line.63"></a>
+<span class="sourceLineNo">064</span> Set<ServerName>
previouslyFailedServers =<a name="line.64"></a>
+<span class="sourceLineNo">065</span>
master.getMasterWalManager().getFailedServersFromLogFolders();<a
name="line.65"></a>
+<span class="sourceLineNo">066</span><a name="line.66"></a>
+<span class="sourceLineNo">067</span> // Master has recovered hbase:meta
region server and we put<a name="line.67"></a>
+<span class="sourceLineNo">068</span> // other failed region servers in a
queue to be handled later by SSH<a name="line.68"></a>
+<span class="sourceLineNo">069</span> for (ServerName tmpServer :
previouslyFailedServers) {<a name="line.69"></a>
+<span class="sourceLineNo">070</span>
master.getServerManager().processDeadServer(tmpServer, true);<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><a name="line.73"></a>
+<span class="sourceLineNo">074</span> /**<a name="line.74"></a>
+<span class="sourceLineNo">075</span> * For assigning hbase:meta replicas
only.<a name="line.75"></a>
+<span class="sourceLineNo">076</span> * TODO: The way this assign runs,
nothing but chance to stop all replicas showing up on same<a name="line.76"></a>
+<span class="sourceLineNo">077</span> * server as the hbase:meta region.<a
name="line.77"></a>
+<span class="sourceLineNo">078</span> */<a name="line.78"></a>
+<span class="sourceLineNo">079</span> protected void assignMetaReplicas()<a
name="line.79"></a>
+<span class="sourceLineNo">080</span> throws IOException,
InterruptedException, KeeperException {<a name="line.80"></a>
+<span class="sourceLineNo">081</span> int numReplicas =
master.getConfiguration().getInt(HConstants.META_REPLICAS_NUM,<a
name="line.81"></a>
+<span class="sourceLineNo">082</span>
HConstants.DEFAULT_META_REPLICA_NUM);<a name="line.82"></a>
+<span class="sourceLineNo">083</span> if (numReplicas <= 1) {<a
name="line.83"></a>
+<span class="sourceLineNo">084</span> // No replicaas to assign.
Return.<a name="line.84"></a>
+<span class="sourceLineNo">085</span> return;<a name="line.85"></a>
+<span class="sourceLineNo">086</span> }<a name="line.86"></a>
+<span class="sourceLineNo">087</span> final AssignmentManager
assignmentManager = master.getAssignmentManager();<a name="line.87"></a>
+<span class="sourceLineNo">088</span> if
(!assignmentManager.isMetaInitialized()) {<a name="line.88"></a>
+<span class="sourceLineNo">089</span> throw new
IllegalStateException("hbase:meta must be initialized first before we can " +<a
name="line.89"></a>
+<span class="sourceLineNo">090</span> "assign out its replicas");<a
name="line.90"></a>
+<span class="sourceLineNo">091</span> }<a name="line.91"></a>
+<span class="sourceLineNo">092</span> ServerName metaServername =<a
name="line.92"></a>
+<span class="sourceLineNo">093</span>
this.master.getMetaTableLocator().getMetaRegionLocation(this.master.getZooKeeper());<a
name="line.93"></a>
+<span class="sourceLineNo">094</span> for (int i = 1; i < numReplicas;
i++) {<a name="line.94"></a>
+<span class="sourceLineNo">095</span> // Get current meta state for
replica from zk.<a name="line.95"></a>
+<span class="sourceLineNo">096</span> RegionState metaState =
MetaTableLocator.getMetaRegionState(master.getZooKeeper(), i);<a
name="line.96"></a>
+<span class="sourceLineNo">097</span> RegionInfo hri =
RegionReplicaUtil.getRegionInfoForReplica(<a name="line.97"></a>
+<span class="sourceLineNo">098</span>
RegionInfoBuilder.FIRST_META_REGIONINFO, i);<a name="line.98"></a>
+<span class="sourceLineNo">099</span>
LOG.debug(hri.getRegionNameAsString() + " replica region state from zookeeper="
+ metaState);<a name="line.99"></a>
+<span class="sourceLineNo">100</span> if
(metaServername.equals(metaState.getServerName())) {<a name="line.100"></a>
+<span class="sourceLineNo">101</span> metaState = null;<a
name="line.101"></a>
+<span class="sourceLineNo">102</span>
LOG.info(hri.getRegionNameAsString() +<a name="line.102"></a>
+<span class="sourceLineNo">103</span> " old location is same as
current hbase:meta location; setting location as null...");<a
name="line.103"></a>
+<span class="sourceLineNo">104</span> }<a name="line.104"></a>
+<span class="sourceLineNo">105</span> // These assigns run inline. All is
blocked till they complete. Only interrupt is shutting<a name="line.105"></a>
+<span class="sourceLineNo">106</span> // down hosting server which calls
AM#stop.<a name="line.106"></a>
+<span class="sourceLineNo">107</span> if (metaState != null &&
metaState.getServerName() != null) {<a name="line.107"></a>
+<span class="sourceLineNo">108</span> // Try to retain old
assignment.<a name="line.108"></a>
+<span class="sourceLineNo">109</span> assignmentManager.assign(hri,
metaState.getServerName());<a name="line.109"></a>
+<span class="sourceLineNo">110</span> } else {<a name="line.110"></a>
+<span class="sourceLineNo">111</span> assignmentManager.assign(hri);<a
name="line.111"></a>
+<span class="sourceLineNo">112</span> }<a name="line.112"></a>
+<span class="sourceLineNo">113</span> }<a name="line.113"></a>
+<span class="sourceLineNo">114</span>
unassignExcessMetaReplica(numReplicas);<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> private void
unassignExcessMetaReplica(int numMetaReplicasConfigured) {<a
name="line.117"></a>
+<span class="sourceLineNo">118</span> final ZKWatcher zooKeeper =
master.getZooKeeper();<a name="line.118"></a>
+<span class="sourceLineNo">119</span> // unassign the unneeded replicas
(for e.g., if the previous master was configured<a name="line.119"></a>
+<span class="sourceLineNo">120</span> // with a replication of 3 and now it
is 2, we need to unassign the 1 unneeded replica)<a name="line.120"></a>
+<span class="sourceLineNo">121</span> try {<a name="line.121"></a>
+<span class="sourceLineNo">122</span> List<String>
metaReplicaZnodes = zooKeeper.getMetaReplicaNodes();<a name="line.122"></a>
+<span class="sourceLineNo">123</span> for (String metaReplicaZnode :
metaReplicaZnodes) {<a name="line.123"></a>
+<span class="sourceLineNo">124</span> int replicaId =
zooKeeper.getZNodePaths().getMetaReplicaIdFromZnode(metaReplicaZnode);<a
name="line.124"></a>
+<span class="sourceLineNo">125</span> if (replicaId >=
numMetaReplicasConfigured) {<a name="line.125"></a>
+<span class="sourceLineNo">126</span> RegionState r =
MetaTableLocator.getMetaRegionState(zooKeeper, replicaId);<a
name="line.126"></a>
+<span class="sourceLineNo">127</span> LOG.info("Closing excess
replica of meta region " + r.getRegion());<a name="line.127"></a>
+<span class="sourceLineNo">128</span> // send a close and wait for a
max of 30 seconds<a name="line.128"></a>
+<span class="sourceLineNo">129</span>
ServerManager.closeRegionSilentlyAndWait(master.getClusterConnection(),<a
name="line.129"></a>
+<span class="sourceLineNo">130</span> r.getServerName(),
r.getRegion(), 30000);<a name="line.130"></a>
+<span class="sourceLineNo">131</span> ZKUtil.deleteNode(zooKeeper,
zooKeeper.getZNodePaths().getZNodeForReplica(replicaId));<a name="line.131"></a>
+<span class="sourceLineNo">132</span> }<a name="line.132"></a>
+<span class="sourceLineNo">133</span> }<a name="line.133"></a>
+<span class="sourceLineNo">134</span> } catch (Exception ex) {<a
name="line.134"></a>
+<span class="sourceLineNo">135</span> // ignore the exception since we
don't want the master to be wedged due to potential<a name="line.135"></a>
+<span class="sourceLineNo">136</span> // issues in the cleanup of the
extra regions. We can do that cleanup via hbck or manually<a
name="line.136"></a>
+<span class="sourceLineNo">137</span> LOG.warn("Ignoring exception " +
ex);<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>
+<span class="sourceLineNo">140</span><a name="line.140"></a>
+<span class="sourceLineNo">141</span> private void
enableCrashedServerProcessing() throws InterruptedException {<a
name="line.141"></a>
+<span class="sourceLineNo">142</span> // If crashed server processing is
disabled, we enable it and expire those dead but not expired<a
name="line.142"></a>
+<span class="sourceLineNo">143</span> // servers. This is required so that
if meta is assigning to a server which dies after<a name="line.143"></a>
+<span class="sourceLineNo">144</span> // assignMeta starts assignment,
ServerCrashProcedure can re-assign it. Otherwise, we will be<a
name="line.144"></a>
+<span class="sourceLineNo">145</span> // stuck here waiting forever if
waitForMeta is specified.<a name="line.145"></a>
+<span class="sourceLineNo">146</span> if
(!master.isServerCrashProcessingEnabled()) {<a name="line.146"></a>
+<span class="sourceLineNo">147</span>
master.setServerCrashProcessingEnabled(true);<a name="line.147"></a>
+<span class="sourceLineNo">148</span>
master.getServerManager().processQueuedDeadServers();<a name="line.148"></a>
+<span class="sourceLineNo">149</span> }<a name="line.149"></a>
+<span class="sourceLineNo">150</span> }<a name="line.150"></a>
+<span class="sourceLineNo">151</span>}<a name="line.151"></a>
