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https://issues.apache.org/jira/browse/YARN-5829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941469#comment-15941469
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ASF GitHub Bot commented on YARN-5829:
--------------------------------------
Github user szegedim commented on a diff in the pull request:
https://github.com/apache/hadoop/pull/201#discussion_r108024703
--- Diff:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSSchedulerNode.java
---
@@ -110,16 +149,57 @@ synchronized FSAppAttempt getReservedAppSchedulable()
{
}
/**
+ * List reserved resources after preemption and assign them to the
+ * appropriate applications in a FIFO order.
+ * It is a good practice to call {@link #cleanupPreemptionList()}
+ * after this call
+ * @return if any resources were allocated
+ */
+ synchronized LinkedHashMap<FSAppAttempt, Resource> getPreemptionList() {
+ cleanupPreemptionList();
+ return new LinkedHashMap<>(resourcesPreemptedForApp);
+ }
+
+ /**
+ * Remove apps that have their preemption requests fulfilled
+ */
+ synchronized void cleanupPreemptionList() {
--- End diff --
Done.
> FS preemption should reserve a node before considering containers on it for
> preemption
> --------------------------------------------------------------------------------------
>
> Key: YARN-5829
> URL: https://issues.apache.org/jira/browse/YARN-5829
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: fairscheduler
> Reporter: Karthik Kambatla
> Assignee: Miklos Szegedi
>
> FS preemption evaluates nodes for preemption, and subsequently preempts
> identified containers. If this node is not reserved for a specific
> application, any other application could be allocated resources on this node.
> Reserving the node for the starved application before preempting containers
> would help avoid this.
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