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| <div class="subTitle">org.apache.hadoop.yarn.server.resourcemanager</div> |
| <h2 title="Class DecommissioningNodesWatcher" class="title">Class DecommissioningNodesWatcher</h2> |
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| <li>org.apache.hadoop.yarn.server.resourcemanager.DecommissioningNodesWatcher</li> |
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| <pre>public class <span class="typeNameLabel">DecommissioningNodesWatcher</span> |
| 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">DecommissioningNodesWatcher is used by ResourceTrackerService to track |
| DECOMMISSIONING nodes to decide when, after all running containers on |
| the node have completed, will be transitioned into DECOMMISSIONED state |
| (NodeManager will be told to shutdown). |
| Under MR application, a node, after completes all its containers, |
| may still serve it map output data during the duration of the application |
| for reducers. A fully graceful mechanism would keep such DECOMMISSIONING |
| nodes until all involved applications complete. It could be however |
| undesirable under long-running applications scenario where a bunch |
| of "idle" nodes would stay around for long period of time. |
| |
| DecommissioningNodesWatcher balance such concern with a timeout policy --- |
| a DECOMMISSIONING node will be DECOMMISSIONED no later than |
| DECOMMISSIONING_TIMEOUT regardless of running containers or applications. |
| |
| DecommissioningNodesWatcher basically is no cost when no node is |
| DECOMMISSIONING.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.DecommissioningNodeStatus.html" title="enum in org.apache.hadoop.yarn.server.resourcemanager">DecommissioningNodesWatcher.DecommissioningNodeStatus</a></span></code> |
| <div class="block">Status about a specific decommissioning node.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.html#DecommissioningNodesWatcher-org.apache.hadoop.yarn.server.resourcemanager.RMContext-">DecommissioningNodesWatcher</a></span>(<a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/RMContext.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager">RMContext</a> rmContext)</code> </td> |
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| <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.DecommissioningNodeStatus.html" title="enum in org.apache.hadoop.yarn.server.resourcemanager">DecommissioningNodesWatcher.DecommissioningNodeStatus</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.html#checkDecommissioningStatus-org.apache.hadoop.yarn.api.records.NodeId-">checkDecommissioningStatus</a></span>(org.apache.hadoop.yarn.api.records.NodeId nodeId)</code> </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.html#checkReadyToBeDecommissioned-org.apache.hadoop.yarn.api.records.NodeId-">checkReadyToBeDecommissioned</a></span>(org.apache.hadoop.yarn.api.records.NodeId nodeId)</code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.html#init-org.apache.hadoop.conf.Configuration-">init</a></span>(org.apache.hadoop.conf.Configuration conf)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.html#remove-org.apache.hadoop.yarn.api.records.NodeId-">remove</a></span>(org.apache.hadoop.yarn.api.records.NodeId nodeId)</code> </td> |
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| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.html#stop--">stop</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.html#update-org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode-org.apache.hadoop.yarn.server.api.records.NodeStatus-">update</a></span>(<a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/rmnode/RMNode.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager.rmnode">RMNode</a> rmNode, |
| org.apache.hadoop.yarn.server.api.records.NodeStatus remoteNodeStatus)</code> |
| <div class="block">Update rmNode decommissioning status based on NodeStatus.</div> |
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| <h3>Constructor Detail</h3> |
| <a name="DecommissioningNodesWatcher-org.apache.hadoop.yarn.server.resourcemanager.RMContext-"> |
| <!-- --> |
| </a> |
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| <h4>DecommissioningNodesWatcher</h4> |
| <pre>public DecommissioningNodesWatcher(<a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/RMContext.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager">RMContext</a> rmContext)</pre> |
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| <h4>init</h4> |
| <pre>public void init(org.apache.hadoop.conf.Configuration conf)</pre> |
| </li> |
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| <a name="update-org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode-org.apache.hadoop.yarn.server.api.records.NodeStatus-"> |
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| <h4>update</h4> |
| <pre>public void update(<a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/rmnode/RMNode.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager.rmnode">RMNode</a> rmNode, |
| org.apache.hadoop.yarn.server.api.records.NodeStatus remoteNodeStatus)</pre> |
| <div class="block">Update rmNode decommissioning status based on NodeStatus.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>rmNode</code> - The node</dd> |
| <dd><code>remoteNodeStatus</code> - latest NodeStatus</dd> |
| </dl> |
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| <h4>remove</h4> |
| <pre>public void remove(org.apache.hadoop.yarn.api.records.NodeId nodeId)</pre> |
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| <h4>stop</h4> |
| <pre>public void stop()</pre> |
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| <h4>checkReadyToBeDecommissioned</h4> |
| <pre>public boolean checkReadyToBeDecommissioned(org.apache.hadoop.yarn.api.records.NodeId nodeId)</pre> |
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| <h4>checkDecommissioningStatus</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/DecommissioningNodesWatcher.DecommissioningNodeStatus.html" title="enum in org.apache.hadoop.yarn.server.resourcemanager">DecommissioningNodesWatcher.DecommissioningNodeStatus</a> checkDecommissioningStatus(org.apache.hadoop.yarn.api.records.NodeId nodeId)</pre> |
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