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| <h2 title="Class PreemptionMessage" class="title">Class PreemptionMessage</h2> |
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| <li>org.apache.hadoop.yarn.api.records.PreemptionMessage</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public abstract class <span class="typeNameLabel">PreemptionMessage</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">A <a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionMessage.html" title="class in org.apache.hadoop.yarn.api.records"><code>PreemptionMessage</code></a> is part of the RM-AM protocol, and it is used by |
| the RM to specify resources that the RM wants to reclaim from this |
| <code>ApplicationMaster</code> (AM). The AM receives a <a href="../../../../../../org/apache/hadoop/yarn/api/records/StrictPreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records"><code>StrictPreemptionContract</code></a> message encoding which containers the platform may |
| forcibly kill, granting it an opportunity to checkpoint state or adjust its |
| execution plan. The message may also include a <a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records"><code>PreemptionContract</code></a> |
| granting the AM more latitude in selecting which resources to return to the |
| cluster. |
| <p> |
| The AM should decode both parts of the message. The <a href="../../../../../../org/apache/hadoop/yarn/api/records/StrictPreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records"><code>StrictPreemptionContract</code></a> specifies particular allocations that the RM |
| requires back. The AM can checkpoint containers' state, adjust its execution |
| plan to move the computation, or take no action and hope that conditions that |
| caused the RM to ask for the container will change. |
| <p> |
| In contrast, the <a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records"><code>PreemptionContract</code></a> also includes a description of |
| resources with a set of containers. If the AM releases containers matching |
| that profile, then the containers enumerated in <a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionContract.html#getContainers--"><code>PreemptionContract.getContainers()</code></a> may not be killed. |
| <p> |
| Each preemption message reflects the RM's current understanding of the |
| cluster state, so a request to return <em>N</em> containers may not |
| reflect containers the AM is releasing, recently exited containers the RM has |
| yet to learn about, or new containers allocated before the message was |
| generated. Conversely, an RM may request a different profile of containers in |
| subsequent requests. |
| <p> |
| The policy enforced by the RM is part of the scheduler. Generally, only |
| containers that have been requested consistently should be killed, but the |
| details are not specified.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionMessage.html#PreemptionMessage--">PreemptionMessage</a></span>()</code> </td> |
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| <td class="colFirst"><code>abstract <a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records">PreemptionContract</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionMessage.html#getContract--">getContract</a></span>()</code> </td> |
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| <td class="colFirst"><code>abstract <a href="../../../../../../org/apache/hadoop/yarn/api/records/StrictPreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records">StrictPreemptionContract</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionMessage.html#getStrictContract--">getStrictContract</a></span>()</code> </td> |
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| <h4>PreemptionMessage</h4> |
| <pre>public PreemptionMessage()</pre> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public abstract <a href="../../../../../../org/apache/hadoop/yarn/api/records/StrictPreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records">StrictPreemptionContract</a> getStrictContract()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Specific resources that may be killed by the |
| <code>ResourceManager</code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getContract</h4> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public abstract <a href="../../../../../../org/apache/hadoop/yarn/api/records/PreemptionContract.html" title="class in org.apache.hadoop.yarn.api.records">PreemptionContract</a> getContract()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Contract describing resources to return to the cluster.</dd> |
| </dl> |
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