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 <h2 title="Class ServerManager" class="title">Class ServerManager</h2>
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 <pre>@InterfaceAudience.Private
 public class <a href="../../../../../src-html/org/apache/hadoop/hbase/master/ServerManager.html#line.107">ServerManager</a>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
 <div class="block">The ServerManager class manages info about region servers.
  <p>
  Maintains lists of online and dead servers.  Processes the startups,
  shutdowns, and deaths of region servers.
  <p>
  Servers are distinguished in two different ways.  A given server has a
  location, specified by hostname and port, and of which there can only be one
  online at any given time.  A server instance is specified by the location
  (hostname and port) as well as the startcode (timestamp from when the server
  was started).  This is used to differentiate a restarted instance of a given
  server from the original instance.
  <p>
  If a sever is known not to be running any more, it is called dead. The dead
  server needs to be handled by a ServerShutdownHandler.  If the handler is not
  enabled yet, the server can't be handled right away so it is queued up.
  After the handler is enabled, the server will be submitted to a handler to handle.
  However, the handler may be just partially enabled.  If so,
  the server cannot be fully processed, and be queued up for further processing.
  A server is fully processed only after the handler is fully enabled
  and has completed the handling.</div>
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 <th class="colFirst" scope="col">Modifier and Type</th>
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 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#drainingServers">drainingServers</a></span></code>
 <div class="block">List of region servers that should not get any more new regions.</div>
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 <td class="colFirst"><code>static int</code></td>
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 <div class="block">The last flushed sequence id for a region.</div>
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 <td class="colFirst"><code>private boolean</code></td>
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 <div class="block">Listeners that are called on server events.</div>
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 <td class="colFirst"><code>private long</code></td>
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 <tr class="altColor">
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 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#onlineServers">onlineServers</a></span></code>
 <div class="block">Map of registered servers to their current load</div>
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 <tr class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <div class="block">see HBASE-20727
  if set to true, flushedSequenceIdByRegion and storeFlushedSequenceIdsByRegion
  will be persisted to HDFS and loaded when master restart to speed up log split</div>
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 <td class="colFirst"><code>static boolean</code></td>
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 <td class="colFirst"><code>private boolean</code></td>
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 <div class="block">The last flushed sequence id for a store in a region.</div>
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 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#addServerToDrainList-org.apache.hadoop.hbase.ServerName-">addServerToDrainList</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn)</code>
 <div class="block">Add the server to the drain list.</div>
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 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#areDeadServersInProgress--">areDeadServersInProgress</a></span>()</code>
 <div class="block">Checks if any dead servers are currently in progress.</div>
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 <td class="colFirst"><code>(package private) boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#checkAndRecordNewServer-org.apache.hadoop.hbase.ServerName-org.apache.hadoop.hbase.ServerMetrics-">checkAndRecordNewServer</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
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 <div class="block">Check is a server of same host and port already exists,
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 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#checkClockSkew-org.apache.hadoop.hbase.ServerName-long-">checkClockSkew</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
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 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#checkIsDead-org.apache.hadoop.hbase.ServerName-java.lang.String-">checkIsDead</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
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 <div class="block">Called when RegionServer first reports in for duty and thereafter each
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 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>(package private) void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#clearDeadServersWithSameHostNameAndPortOfOnlineServer--">clearDeadServersWithSameHostNameAndPortOfOnlineServer</a></span>()</code>
 <div class="block">To clear any dead server with same host name and port of any online server</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#closeRegionSilentlyAndWait-org.apache.hadoop.hbase.client.AsyncClusterConnection-org.apache.hadoop.hbase.ServerName-org.apache.hadoop.hbase.client.RegionInfo-long-">closeRegionSilentlyAndWait</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/AsyncClusterConnection.html" title="interface in org.apache.hadoop.hbase.client">AsyncClusterConnection</a>&nbsp;connection,
                           <a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;server,
                           <a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;region,
                           long&nbsp;timeout)</code>
 <div class="block">Contacts a region server and waits up to timeout ms
  to close the region.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#countOfRegionServers--">countOfRegionServers</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#createDestinationServersList--">createDestinationServersList</a></span>()</code>
 <div class="block">Calls <a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#createDestinationServersList-java.util.List-"><code>createDestinationServersList(java.util.List&lt;org.apache.hadoop.hbase.ServerName&gt;)</code></a> without server to exclude.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#createDestinationServersList-java.util.List-">createDestinationServersList</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;serversToExclude)</code>
 <div class="block">Creates a list of possible destinations for a region.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#expireServer-org.apache.hadoop.hbase.ServerName-">expireServer</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>
 <div class="block">Expire the passed server.</div>
 </td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>(package private) long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#expireServer-org.apache.hadoop.hbase.ServerName-boolean-">expireServer</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
             boolean&nbsp;force)</code>&nbsp;</td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>(package private) void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#findDeadServersAndProcess-java.util.Set-java.util.Set-">findDeadServersAndProcess</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;deadServersFromPE,
                          <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;liveServersFromWALDir)</code>
 <div class="block">Find out the region servers crashed between the crash of the previous master instance and the
  current master instance and schedule SCP for them.</div>
 </td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#findServerWithSameHostnamePortWithLock-org.apache.hadoop.hbase.ServerName-">findServerWithSameHostnamePortWithLock</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>
 <div class="block">Assumes onlineServers is locked.</div>
 </td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getAverageLoad--">getAverageLoad</a></span>()</code>
 <div class="block">Compute the average load across all region servers.</div>
 </td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/master/DeadServer.html" title="class in org.apache.hadoop.hbase.master">DeadServer</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getDeadServers--">getDeadServers</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getDrainingServersList--">getDrainingServersList</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i17" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentNavigableMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentNavigableMap</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getFlushedSequenceIdByRegion--">getFlushedSequenceIdByRegion</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i18" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getInfoPort-org.apache.hadoop.hbase.ServerName-">getInfoPort</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
 </tr>
 <tr id="i19" class="rowColor">
 <td class="colFirst"><code>org.apache.hadoop.hbase.shaded.protobuf.generated.ClusterStatusProtos.RegionStoreSequenceIds</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getLastFlushedSequenceId-byte:A-">getLastFlushedSequenceId</a></span>(byte[]&nbsp;encodedRegionName)</code>&nbsp;</td>
 </tr>
 <tr id="i20" class="altColor">
 <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/ServerMetrics.html" title="interface in org.apache.hadoop.hbase">ServerMetrics</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getLoad-org.apache.hadoop.hbase.ServerName-">getLoad</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
 </tr>
 <tr id="i21" class="rowColor">
 <td class="colFirst"><code>private int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getMinToStart--">getMinToStart</a></span>()</code>
 <div class="block">Calculate min necessary to start.</div>
 </td>
 </tr>
 <tr id="i22" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<a href="../../../../../org/apache/hadoop/hbase/ServerMetrics.html" title="interface in org.apache.hadoop.hbase">ServerMetrics</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getOnlineServers--">getOnlineServers</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i23" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getOnlineServersList--">getOnlineServersList</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i24" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getOnlineServersListWithPredicator-java.util.List-java.util.function.Predicate-">getOnlineServersListWithPredicator</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;keys,
                                   <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerMetrics.html" title="interface in org.apache.hadoop.hbase">ServerMetrics</a>&gt;&nbsp;idleServerPredicator)</code>&nbsp;</td>
 </tr>
 <tr id="i25" class="rowColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getRegionServersInZK-org.apache.hadoop.hbase.zookeeper.ZKWatcher-">getRegionServersInZK</a></span>(<a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKWatcher.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKWatcher</a>&nbsp;zkw)</code>&nbsp;</td>
 </tr>
 <tr id="i26" class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getStrForMax-int-">getStrForMax</a></span>(int&nbsp;max)</code>&nbsp;</td>
 </tr>
 <tr id="i27" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getVersion-org.apache.hadoop.hbase.ServerName-">getVersion</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>
 <div class="block">May return "0.0.0" when server is not online</div>
 </td>
 </tr>
 <tr id="i28" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#getVersionNumber-org.apache.hadoop.hbase.ServerName-">getVersionNumber</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>
 <div class="block">May return 0 when server is not online.</div>
 </td>
 </tr>
 <tr id="i29" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#isClusterShutdown--">isClusterShutdown</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i30" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#isRegionInServerManagerStates-org.apache.hadoop.hbase.client.RegionInfo-">isRegionInServerManagerStates</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;hri)</code>&nbsp;</td>
 </tr>
 <tr id="i31" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#isServerDead-org.apache.hadoop.hbase.ServerName-">isServerDead</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>
 <div class="block">Check if a server is known to be dead.</div>
 </td>
 </tr>
 <tr id="i32" class="altColor">
 <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.ServerLiveState.html" title="enum in org.apache.hadoop.hbase.master">ServerManager.ServerLiveState</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#isServerKnownAndOnline-org.apache.hadoop.hbase.ServerName-">isServerKnownAndOnline</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
 </tr>
 <tr id="i33" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#isServerOnline-org.apache.hadoop.hbase.ServerName-">isServerOnline</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
 </tr>
 <tr id="i34" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#isServerUnknown-org.apache.hadoop.hbase.ServerName-">isServerUnknown</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>
 <div class="block">Check if a server is unknown.</div>
 </td>
 </tr>
 <tr id="i35" class="rowColor">
 <td class="colFirst"><code>(package private) void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#letRegionServersShutdown--">letRegionServersShutdown</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i36" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#loadLastFlushedSequenceIds--">loadLastFlushedSequenceIds</a></span>()</code>
 <div class="block">Load last flushed sequence id of each region from HDFS, if persisted</div>
 </td>
 </tr>
 <tr id="i37" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#moveFromOnlineToDeadServers-org.apache.hadoop.hbase.ServerName-">moveFromOnlineToDeadServers</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn)</code>
 <div class="block">Called when server has expired.</div>
 </td>
 </tr>
 <tr id="i38" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#persistRegionLastFlushedSequenceIds--">persistRegionLastFlushedSequenceIds</a></span>()</code>
 <div class="block">Persist last flushed sequence id of each region to HDFS</div>
 </td>
 </tr>
 <tr id="i39" class="rowColor">
 <td class="colFirst"><code>(package private) void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#recordNewServerWithLock-org.apache.hadoop.hbase.ServerName-org.apache.hadoop.hbase.ServerMetrics-">recordNewServerWithLock</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
                        <a href="../../../../../org/apache/hadoop/hbase/ServerMetrics.html" title="interface in org.apache.hadoop.hbase">ServerMetrics</a>&nbsp;sl)</code>
 <div class="block">Adds the onlineServers list.</div>
 </td>
 </tr>
 <tr id="i40" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#regionServerReport-org.apache.hadoop.hbase.ServerName-org.apache.hadoop.hbase.ServerMetrics-">regionServerReport</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn,
                   <a href="../../../../../org/apache/hadoop/hbase/ServerMetrics.html" title="interface in org.apache.hadoop.hbase">ServerMetrics</a>&nbsp;sl)</code>&nbsp;</td>
 </tr>
 <tr id="i41" class="rowColor">
 <td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#regionServerStartup-org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionServerStartupRequest-int-java.lang.String-java.net.InetAddress-">regionServerStartup</a></span>(org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionServerStartupRequest&nbsp;request,
                    int&nbsp;versionNumber,
                    <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;version,
                    <a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a>&nbsp;ia)</code>
 <div class="block">Let the server manager know a new regionserver has come online</div>
 </td>
 </tr>
 <tr id="i42" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#registerListener-org.apache.hadoop.hbase.master.ServerListener-">registerListener</a></span>(<a href="../../../../../org/apache/hadoop/hbase/master/ServerListener.html" title="interface in org.apache.hadoop.hbase.master">ServerListener</a>&nbsp;listener)</code>
 <div class="block">Add the listener to the notification list.</div>
 </td>
 </tr>
 <tr id="i43" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#removeDeletedRegionFromLoadedFlushedSequenceIds--">removeDeletedRegionFromLoadedFlushedSequenceIds</a></span>()</code>
 <div class="block">Regions may have been removed between latest persist of FlushedSequenceIds
  and master abort.</div>
 </td>
 </tr>
 <tr id="i44" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#removeRegion-org.apache.hadoop.hbase.client.RegionInfo-">removeRegion</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo)</code>
 <div class="block">Called by delete table and similar to notify the ServerManager that a region was removed.</div>
 </td>
 </tr>
 <tr id="i45" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#removeRegions-java.util.List-">removeRegions</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions)</code>
 <div class="block">Called by delete table and similar to notify the ServerManager that a region was removed.</div>
 </td>
 </tr>
 <tr id="i46" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#removeServerFromDrainList-org.apache.hadoop.hbase.ServerName-">removeServerFromDrainList</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn)</code>&nbsp;</td>
 </tr>
 <tr id="i47" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#shutdownCluster--">shutdownCluster</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i48" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#startChore--">startChore</a></span>()</code>
 <div class="block">start chore in ServerManager</div>
 </td>
 </tr>
 <tr id="i49" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ServerManager.html#stop--">stop</a></span>()</code>
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 <div class="block">Check is a server of same host and port already exists,
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 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>serverName</code> - the server to check and record</dd>
 <dd><code>sl</code> - the server load on the server</dd>
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 <div class="block">Find out the region servers crashed between the crash of the previous master instance and the
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  <p/>
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  <p/>
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 <dl>
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 <dl>
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 <div class="block">Called when RegionServer first reports in for duty and thereafter each
  time it heartbeats to make sure it is has not been figured for dead.
  If this server is on the dead list, reject it with a YouAreDeadException.
  If it was dead but came back with a new start code, remove the old entry
  from the dead list.</div>
 <dl>
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 <dd><code>what</code> - START or REPORT</dd>
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 <div class="block">Assumes onlineServers is locked.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>ServerName with matching hostname and port.</dd>
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 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
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 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>org.apache.zookeeper.KeeperException</code></dd>
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 <div class="block">Add the server to the drain list.</div>
 <dl>
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 <dd><code>sn</code> - </dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>True if the server is added or the server is already on the drain list.</dd>
 </dl>
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 <a name="closeRegionSilentlyAndWait-org.apache.hadoop.hbase.client.AsyncClusterConnection-org.apache.hadoop.hbase.ServerName-org.apache.hadoop.hbase.client.RegionInfo-long-">
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 <div class="block">Contacts a region server and waits up to timeout ms
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 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <div class="block">Wait for the region servers to report in.
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     region servers is reached
   - the 'hbase.master.wait.on.regionservers.mintostart' is reached AND
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       'hbase.master.wait.on.regionservers.interval' time AND
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 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
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 <dd><code>keys</code> - The target server name</dd>
 <dd><code>idleServerPredicator</code> - Evaluates the server on the given load</dd>
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