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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5829) FS preemption should reserve a node before considering containers on it for preemption
Date Thu, 23 Mar 2017 22:51:42 GMT

    [ https://issues.apache.org/jira/browse/YARN-5829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939372#comment-15939372
] 

ASF GitHub Bot commented on YARN-5829:
--------------------------------------

Github user kambatla commented on a diff in the pull request:

    https://github.com/apache/hadoop/pull/201#discussion_r107774052
  
    --- Diff: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSPreemptionThread.java
---
    @@ -113,11 +113,6 @@ public void run() {
             List<FSSchedulerNode> potentialNodes = scheduler.getNodeTracker()
                 .getNodesByResourceName(rr.getResourceName());
             for (FSSchedulerNode node : potentialNodes) {
    -          // TODO (YARN-5829): Attempt to reserve the node for starved app.
    -          if (isNodeAlreadyReserved(node, starvedApp)) {
    -            continue;
    -          }
    -
    --- End diff --
    
    Observation: We aren't checking for the node being reserved because the reservation is
only for larger containers. Even if a node is reserved, we can preempt running containers
to fit in a new app. 


> 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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