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From git-site-r...@apache.org
Subject [06/21] hbase-site git commit: Published site at .
Date Sat, 04 Nov 2017 15:17:40 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/edf5597c/devapidocs/src-html/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.RSGroupStartupWorker.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.RSGroupStartupWorker.html b/devapidocs/src-html/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.RSGroupStartupWorker.html
index 55ab0c0..27d1f37 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.RSGroupStartupWorker.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.RSGroupStartupWorker.html
@@ -44,787 +44,874 @@
 <span class="sourceLineNo">036</span><a name="line.36"></a>
 <span class="sourceLineNo">037</span>import org.apache.commons.logging.Log;<a name="line.37"></a>
 <span class="sourceLineNo">038</span>import org.apache.commons.logging.LogFactory;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.Cell;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.Coprocessor;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.HColumnDescriptor;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.HConstants;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.HTableDescriptor;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.MetaTableAccessor;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.MetaTableAccessor.DefaultVisitorBase;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.NamespaceDescriptor;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.ServerName;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.TableName;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.client.ClusterConnection;<a name="line.51"></a>
-<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.client.Delete;<a name="line.52"></a>
-<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.client.Get;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.client.Mutation;<a name="line.54"></a>
-<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.client.Put;<a name="line.55"></a>
-<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.56"></a>
-<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.client.Result;<a name="line.57"></a>
-<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.58"></a>
-<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.client.Table;<a name="line.59"></a>
-<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.client.TableState;<a name="line.60"></a>
-<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.constraint.ConstraintException;<a name="line.61"></a>
-<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.coprocessor.MultiRowMutationEndpoint;<a name="line.62"></a>
-<span class="sourceLineNo">063</span>import org.apache.hadoop.hbase.exceptions.DeserializationException;<a name="line.63"></a>
-<span class="sourceLineNo">064</span>import org.apache.hadoop.hbase.ipc.CoprocessorRpcChannel;<a name="line.64"></a>
-<span class="sourceLineNo">065</span>import org.apache.hadoop.hbase.master.MasterServices;<a name="line.65"></a>
-<span class="sourceLineNo">066</span>import org.apache.hadoop.hbase.master.ServerListener;<a name="line.66"></a>
-<span class="sourceLineNo">067</span>import org.apache.hadoop.hbase.master.TableStateManager;<a name="line.67"></a>
-<span class="sourceLineNo">068</span>import org.apache.hadoop.hbase.net.Address;<a name="line.68"></a>
-<span class="sourceLineNo">069</span>import org.apache.hadoop.hbase.procedure2.Procedure;<a name="line.69"></a>
-<span class="sourceLineNo">070</span>import org.apache.hadoop.hbase.protobuf.ProtobufMagic;<a name="line.70"></a>
-<span class="sourceLineNo">071</span>import org.apache.hadoop.hbase.protobuf.ProtobufUtil;<a name="line.71"></a>
-<span class="sourceLineNo">072</span>import org.apache.hadoop.hbase.protobuf.generated.MultiRowMutationProtos;<a name="line.72"></a>
-<span class="sourceLineNo">073</span>import org.apache.hadoop.hbase.protobuf.generated.RSGroupProtos;<a name="line.73"></a>
-<span class="sourceLineNo">074</span>import org.apache.hadoop.hbase.regionserver.DisabledRegionSplitPolicy;<a name="line.74"></a>
-<span class="sourceLineNo">075</span>import org.apache.hadoop.hbase.security.access.AccessControlLists;<a name="line.75"></a>
-<span class="sourceLineNo">076</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.76"></a>
-<span class="sourceLineNo">077</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.77"></a>
-<span class="sourceLineNo">078</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<a name="line.78"></a>
-<span class="sourceLineNo">079</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.79"></a>
-<span class="sourceLineNo">080</span>import org.apache.zookeeper.KeeperException;<a name="line.80"></a>
-<span class="sourceLineNo">081</span><a name="line.81"></a>
-<span class="sourceLineNo">082</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;<a name="line.82"></a>
-<span class="sourceLineNo">083</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Maps;<a name="line.83"></a>
-<span class="sourceLineNo">084</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Sets;<a name="line.84"></a>
-<span class="sourceLineNo">085</span>import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter;<a name="line.85"></a>
-<span class="sourceLineNo">086</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos;<a name="line.86"></a>
-<span class="sourceLineNo">087</span><a name="line.87"></a>
-<span class="sourceLineNo">088</span>import com.google.protobuf.ServiceException;<a name="line.88"></a>
+<span class="sourceLineNo">039</span>import org.apache.hadoop.conf.Configuration;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.Cell;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.Coprocessor;<a name="line.42"></a>
+<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.43"></a>
+<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.HColumnDescriptor;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.HConstants;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.HTableDescriptor;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.MetaTableAccessor;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.MetaTableAccessor.DefaultVisitorBase;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.NamespaceDescriptor;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.ServerName;<a name="line.50"></a>
+<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.TableName;<a name="line.51"></a>
+<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.client.ClusterConnection;<a name="line.52"></a>
+<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.client.Delete;<a name="line.53"></a>
+<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.client.Get;<a name="line.54"></a>
+<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.client.Mutation;<a name="line.55"></a>
+<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.client.Put;<a name="line.56"></a>
+<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.57"></a>
+<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.client.Result;<a name="line.58"></a>
+<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.59"></a>
+<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.client.Table;<a name="line.60"></a>
+<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.client.TableState;<a name="line.61"></a>
+<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.constraint.ConstraintException;<a name="line.62"></a>
+<span class="sourceLineNo">063</span>import org.apache.hadoop.hbase.coprocessor.MultiRowMutationEndpoint;<a name="line.63"></a>
+<span class="sourceLineNo">064</span>import org.apache.hadoop.hbase.exceptions.DeserializationException;<a name="line.64"></a>
+<span class="sourceLineNo">065</span>import org.apache.hadoop.hbase.ipc.CoprocessorRpcChannel;<a name="line.65"></a>
+<span class="sourceLineNo">066</span>import org.apache.hadoop.hbase.master.MasterServices;<a name="line.66"></a>
+<span class="sourceLineNo">067</span>import org.apache.hadoop.hbase.master.ServerListener;<a name="line.67"></a>
+<span class="sourceLineNo">068</span>import org.apache.hadoop.hbase.master.TableStateManager;<a name="line.68"></a>
+<span class="sourceLineNo">069</span>import org.apache.hadoop.hbase.master.assignment.RegionStates.RegionStateNode;<a name="line.69"></a>
+<span class="sourceLineNo">070</span>import org.apache.hadoop.hbase.net.Address;<a name="line.70"></a>
+<span class="sourceLineNo">071</span>import org.apache.hadoop.hbase.procedure2.Procedure;<a name="line.71"></a>
+<span class="sourceLineNo">072</span>import org.apache.hadoop.hbase.protobuf.ProtobufMagic;<a name="line.72"></a>
+<span class="sourceLineNo">073</span>import org.apache.hadoop.hbase.protobuf.ProtobufUtil;<a name="line.73"></a>
+<span class="sourceLineNo">074</span>import org.apache.hadoop.hbase.protobuf.generated.MultiRowMutationProtos;<a name="line.74"></a>
+<span class="sourceLineNo">075</span>import org.apache.hadoop.hbase.protobuf.generated.RSGroupProtos;<a name="line.75"></a>
+<span class="sourceLineNo">076</span>import org.apache.hadoop.hbase.regionserver.DisabledRegionSplitPolicy;<a name="line.76"></a>
+<span class="sourceLineNo">077</span>import org.apache.hadoop.hbase.security.access.AccessControlLists;<a name="line.77"></a>
+<span class="sourceLineNo">078</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.78"></a>
+<span class="sourceLineNo">079</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.79"></a>
+<span class="sourceLineNo">080</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<a name="line.80"></a>
+<span class="sourceLineNo">081</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.81"></a>
+<span class="sourceLineNo">082</span>import org.apache.zookeeper.KeeperException;<a name="line.82"></a>
+<span class="sourceLineNo">083</span><a name="line.83"></a>
+<span class="sourceLineNo">084</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;<a name="line.84"></a>
+<span class="sourceLineNo">085</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Maps;<a name="line.85"></a>
+<span class="sourceLineNo">086</span>import org.apache.hadoop.hbase.shaded.com.google.common.collect.Sets;<a name="line.86"></a>
+<span class="sourceLineNo">087</span>import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter;<a name="line.87"></a>
+<span class="sourceLineNo">088</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos;<a name="line.88"></a>
 <span class="sourceLineNo">089</span><a name="line.89"></a>
-<span class="sourceLineNo">090</span>/**<a name="line.90"></a>
-<span class="sourceLineNo">091</span> * This is an implementation of {@link RSGroupInfoManager} which makes<a name="line.91"></a>
-<span class="sourceLineNo">092</span> * use of an HBase table as the persistence store for the group information.<a name="line.92"></a>
-<span class="sourceLineNo">093</span> * It also makes use of zookeeper to store group information needed<a name="line.93"></a>
-<span class="sourceLineNo">094</span> * for bootstrapping during offline mode.<a name="line.94"></a>
-<span class="sourceLineNo">095</span> *<a name="line.95"></a>
-<span class="sourceLineNo">096</span> * &lt;h2&gt;Concurrency&lt;/h2&gt;<a name="line.96"></a>
-<span class="sourceLineNo">097</span> * RSGroup state is kept locally in Maps. There is a rsgroup name to cached<a name="line.97"></a>
-<span class="sourceLineNo">098</span> * RSGroupInfo Map at {@link #rsGroupMap} and a Map of tables to the name of the<a name="line.98"></a>
-<span class="sourceLineNo">099</span> * rsgroup they belong too (in {@link #tableMap}). These Maps are persisted to the<a name="line.99"></a>
-<span class="sourceLineNo">100</span> * hbase:rsgroup table (and cached in zk) on each modification.<a name="line.100"></a>
-<span class="sourceLineNo">101</span> *<a name="line.101"></a>
-<span class="sourceLineNo">102</span> * &lt;p&gt;Mutations on state are synchronized but reads can continue without having<a name="line.102"></a>
-<span class="sourceLineNo">103</span> * to wait on an instance monitor, mutations do wholesale replace of the Maps on<a name="line.103"></a>
-<span class="sourceLineNo">104</span> * update -- Copy-On-Write; the local Maps of state are read-only, just-in-case<a name="line.104"></a>
-<span class="sourceLineNo">105</span> * (see flushConfig).<a name="line.105"></a>
-<span class="sourceLineNo">106</span> *<a name="line.106"></a>
-<span class="sourceLineNo">107</span> * &lt;p&gt;Reads must not block else there is a danger we'll deadlock.<a name="line.107"></a>
+<span class="sourceLineNo">090</span>import com.google.protobuf.ServiceException;<a name="line.90"></a>
+<span class="sourceLineNo">091</span><a name="line.91"></a>
+<span class="sourceLineNo">092</span>/**<a name="line.92"></a>
+<span class="sourceLineNo">093</span> * This is an implementation of {@link RSGroupInfoManager} which makes<a name="line.93"></a>
+<span class="sourceLineNo">094</span> * use of an HBase table as the persistence store for the group information.<a name="line.94"></a>
+<span class="sourceLineNo">095</span> * It also makes use of zookeeper to store group information needed<a name="line.95"></a>
+<span class="sourceLineNo">096</span> * for bootstrapping during offline mode.<a name="line.96"></a>
+<span class="sourceLineNo">097</span> *<a name="line.97"></a>
+<span class="sourceLineNo">098</span> * &lt;h2&gt;Concurrency&lt;/h2&gt;<a name="line.98"></a>
+<span class="sourceLineNo">099</span> * RSGroup state is kept locally in Maps. There is a rsgroup name to cached<a name="line.99"></a>
+<span class="sourceLineNo">100</span> * RSGroupInfo Map at {@link #rsGroupMap} and a Map of tables to the name of the<a name="line.100"></a>
+<span class="sourceLineNo">101</span> * rsgroup they belong too (in {@link #tableMap}). These Maps are persisted to the<a name="line.101"></a>
+<span class="sourceLineNo">102</span> * hbase:rsgroup table (and cached in zk) on each modification.<a name="line.102"></a>
+<span class="sourceLineNo">103</span> *<a name="line.103"></a>
+<span class="sourceLineNo">104</span> * &lt;p&gt;Mutations on state are synchronized but reads can continue without having<a name="line.104"></a>
+<span class="sourceLineNo">105</span> * to wait on an instance monitor, mutations do wholesale replace of the Maps on<a name="line.105"></a>
+<span class="sourceLineNo">106</span> * update -- Copy-On-Write; the local Maps of state are read-only, just-in-case<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * (see flushConfig).<a name="line.107"></a>
 <span class="sourceLineNo">108</span> *<a name="line.108"></a>
-<span class="sourceLineNo">109</span> * &lt;p&gt;Clients of this class, the {@link RSGroupAdminEndpoint} for example, want to query and<a name="line.109"></a>
-<span class="sourceLineNo">110</span> * then act on the results of the query modifying cache in zookeeper without another thread<a name="line.110"></a>
-<span class="sourceLineNo">111</span> * making intermediate modifications. These clients synchronize on the 'this' instance so<a name="line.111"></a>
-<span class="sourceLineNo">112</span> * no other has access concurrently. Reads must be able to continue concurrently.<a name="line.112"></a>
-<span class="sourceLineNo">113</span> */<a name="line.113"></a>
-<span class="sourceLineNo">114</span>@InterfaceAudience.Private<a name="line.114"></a>
-<span class="sourceLineNo">115</span>class RSGroupInfoManagerImpl implements RSGroupInfoManager {<a name="line.115"></a>
-<span class="sourceLineNo">116</span>  private static final Log LOG = LogFactory.getLog(RSGroupInfoManagerImpl.class);<a name="line.116"></a>
-<span class="sourceLineNo">117</span><a name="line.117"></a>
-<span class="sourceLineNo">118</span>  /** Table descriptor for &lt;code&gt;hbase:rsgroup&lt;/code&gt; catalog table */<a name="line.118"></a>
-<span class="sourceLineNo">119</span>  private final static HTableDescriptor RSGROUP_TABLE_DESC;<a name="line.119"></a>
-<span class="sourceLineNo">120</span>  static {<a name="line.120"></a>
-<span class="sourceLineNo">121</span>    RSGROUP_TABLE_DESC = new HTableDescriptor(RSGROUP_TABLE_NAME);<a name="line.121"></a>
-<span class="sourceLineNo">122</span>    RSGROUP_TABLE_DESC.addFamily(new HColumnDescriptor(META_FAMILY_BYTES));<a name="line.122"></a>
-<span class="sourceLineNo">123</span>    RSGROUP_TABLE_DESC.setRegionSplitPolicyClassName(DisabledRegionSplitPolicy.class.getName());<a name="line.123"></a>
-<span class="sourceLineNo">124</span>    try {<a name="line.124"></a>
-<span class="sourceLineNo">125</span>      RSGROUP_TABLE_DESC.addCoprocessor(<a name="line.125"></a>
-<span class="sourceLineNo">126</span>        MultiRowMutationEndpoint.class.getName(),<a name="line.126"></a>
-<span class="sourceLineNo">127</span>          null, Coprocessor.PRIORITY_SYSTEM, null);<a name="line.127"></a>
-<span class="sourceLineNo">128</span>    } catch (IOException ex) {<a name="line.128"></a>
-<span class="sourceLineNo">129</span>      throw new RuntimeException(ex);<a name="line.129"></a>
-<span class="sourceLineNo">130</span>    }<a name="line.130"></a>
-<span class="sourceLineNo">131</span>  }<a name="line.131"></a>
-<span class="sourceLineNo">132</span><a name="line.132"></a>
-<span class="sourceLineNo">133</span>  // There two Maps are immutable and wholesale replaced on each modification<a name="line.133"></a>
-<span class="sourceLineNo">134</span>  // so are safe to access concurrently. See class comment.<a name="line.134"></a>
-<span class="sourceLineNo">135</span>  private volatile Map&lt;String, RSGroupInfo&gt; rsGroupMap = Collections.emptyMap();<a name="line.135"></a>
-<span class="sourceLineNo">136</span>  private volatile Map&lt;TableName, String&gt; tableMap = Collections.emptyMap();<a name="line.136"></a>
-<span class="sourceLineNo">137</span><a name="line.137"></a>
-<span class="sourceLineNo">138</span>  private final MasterServices masterServices;<a name="line.138"></a>
-<span class="sourceLineNo">139</span>  private Table rsGroupTable;<a name="line.139"></a>
-<span class="sourceLineNo">140</span>  private final ClusterConnection conn;<a name="line.140"></a>
-<span class="sourceLineNo">141</span>  private final ZooKeeperWatcher watcher;<a name="line.141"></a>
-<span class="sourceLineNo">142</span>  private final RSGroupStartupWorker rsGroupStartupWorker = new RSGroupStartupWorker();<a name="line.142"></a>
-<span class="sourceLineNo">143</span>  // contains list of groups that were last flushed to persistent store<a name="line.143"></a>
-<span class="sourceLineNo">144</span>  private Set&lt;String&gt; prevRSGroups = new HashSet&lt;&gt;();<a name="line.144"></a>
-<span class="sourceLineNo">145</span>  private final ServerEventsListenerThread serverEventsListenerThread =<a name="line.145"></a>
-<span class="sourceLineNo">146</span>      new ServerEventsListenerThread();<a name="line.146"></a>
-<span class="sourceLineNo">147</span><a name="line.147"></a>
-<span class="sourceLineNo">148</span>  private RSGroupInfoManagerImpl(MasterServices masterServices) throws IOException {<a name="line.148"></a>
-<span class="sourceLineNo">149</span>    this.masterServices = masterServices;<a name="line.149"></a>
-<span class="sourceLineNo">150</span>    this.watcher = masterServices.getZooKeeper();<a name="line.150"></a>
-<span class="sourceLineNo">151</span>    this.conn = masterServices.getClusterConnection();<a name="line.151"></a>
-<span class="sourceLineNo">152</span>  }<a name="line.152"></a>
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-<span class="sourceLineNo">154</span>  private synchronized void init() throws IOException{<a name="line.154"></a>
-<span class="sourceLineNo">155</span>    refresh();<a name="line.155"></a>
-<span class="sourceLineNo">156</span>    rsGroupStartupWorker.start();<a name="line.156"></a>
-<span class="sourceLineNo">157</span>    serverEventsListenerThread.start();<a name="line.157"></a>
-<span class="sourceLineNo">158</span>    masterServices.getServerManager().registerListener(serverEventsListenerThread);<a name="line.158"></a>
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-<span class="sourceLineNo">163</span>    instance.init();<a name="line.163"></a>
-<span class="sourceLineNo">164</span>    return instance;<a name="line.164"></a>
+<span class="sourceLineNo">109</span> * &lt;p&gt;Reads must not block else there is a danger we'll deadlock.<a name="line.109"></a>
+<span class="sourceLineNo">110</span> *<a name="line.110"></a>
+<span class="sourceLineNo">111</span> * &lt;p&gt;Clients of this class, the {@link RSGroupAdminEndpoint} for example, want to query and<a name="line.111"></a>
+<span class="sourceLineNo">112</span> * then act on the results of the query modifying cache in zookeeper without another thread<a name="line.112"></a>
+<span class="sourceLineNo">113</span> * making intermediate modifications. These clients synchronize on the 'this' instance so<a name="line.113"></a>
+<span class="sourceLineNo">114</span> * no other has access concurrently. Reads must be able to continue concurrently.<a name="line.114"></a>
+<span class="sourceLineNo">115</span> */<a name="line.115"></a>
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+<span class="sourceLineNo">117</span>class RSGroupInfoManagerImpl implements RSGroupInfoManager {<a name="line.117"></a>
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-<span class

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