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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2641) improve node decommission latency in RM.
Date Mon, 13 Oct 2014 13:42:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-2641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169299#comment-14169299
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Karthik Kambatla commented on YARN-2641:
----------------------------------------

bq. If NodeListManager#refreshNodes happens right after NodeListManager#isValidNode and before
create a new RMNode in ResourceTrackerService#registerNodeManager.

Issuing "yarn rmadmin -refreshNodes" on the RM and the NM registering with the RM are inherently
racy, and I don't think we need to serialize them. 

> improve node decommission latency in RM.
> ----------------------------------------
>
>                 Key: YARN-2641
>                 URL: https://issues.apache.org/jira/browse/YARN-2641
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.5.0
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>         Attachments: YARN-2641.000.patch, YARN-2641.001.patch, YARN-2641.002.patch
>
>
> improve node decommission latency in RM. 
> Currently the node decommission only happened after RM received nodeHeartbeat from the
Node Manager. The node heartbeat interval is configurable. The default value is 1 second.
> It will be better to do the decommission during RM Refresh(NodesListManager) instead
of nodeHeartbeat(ResourceTrackerService).
> This will be a much more serious issue:
> After RM is refreshed (refreshNodes), If the NM to be decommissioned is killed before
NM sent heartbeat to RM. The RMNode will never be decommissioned in RM. The RMNode will only
expire in RM after  "yarn.nm.liveness-monitor.expiry-interval-ms"(default value 10 minutes)
time.



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