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https://issues.apache.org/jira/browse/YARN-6163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862034#comment-15862034
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ASF GitHub Bot commented on YARN-6163:
--------------------------------------
Github user templedf commented on a diff in the pull request:
https://github.com/apache/hadoop/pull/192#discussion_r100639340
--- Diff:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSAppAttempt.java
---
@@ -1106,6 +1111,97 @@ boolean isStarvedForFairShare() {
return !Resources.isNone(fairshareStarvation);
}
+ /**
+ * Helper method for {@link #getStarvedResourceRequests()}:
+ * Given a map of visited {@link ResourceRequest}s, it checks if
+ * {@link ResourceRequest} 'rr' has already been visited. The map is
updated
+ * to reflect visiting 'rr'.
+ */
+ private static boolean checkAndMarkRRVisited(
+ Map<Priority, List<Resource>> visitedRRs, ResourceRequest rr) {
+ Priority priority = rr.getPriority();
+ Resource capability = rr.getCapability();
+ if (visitedRRs.containsKey(priority)) {
+ List<Resource> rrList = visitedRRs.get(priority);
+ if (rrList.contains(capability)) {
--- End diff --
Can we assume that resource requests are this unique?
> FS Preemption is a trickle for severely starved applications
> ------------------------------------------------------------
>
> Key: YARN-6163
> URL: https://issues.apache.org/jira/browse/YARN-6163
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: fairscheduler
> Affects Versions: 2.9.0
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Attachments: yarn-6163-1.patch
>
>
> With current logic, only one RR is considered per each instance of marking an
> application starved. This marking happens only on the update call that runs
> every 500ms. Due to this, an application that is severely starved takes
> forever to reach fairshare based on preemptions.
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