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From "Eli Reisman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-477) Fetching locality info in InputSplitPathOrganizer causes jobs to hang
Date Thu, 10 Jan 2013 21:10:13 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13550416#comment-13550416
] 

Eli Reisman commented on GIRAPH-477:
------------------------------------

lets do 473 first, this is smaller. Sound good?

                
> Fetching locality info in InputSplitPathOrganizer causes jobs to hang
> ---------------------------------------------------------------------
>
>                 Key: GIRAPH-477
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-477
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Alessandro Presta
>            Assignee: Alessandro Presta
>         Attachments: GIRAPH-477.patch
>
>
> In the presence of many input splits (>6000 in our case) and input split threads (3000),
the loop that fetches locality info for all splits from ZooKeeper becomes a bottleneck. A
few workers aren't able to even iterate once over the list, run into increased GC pauses,
and eventually time out.
> Furthermore, depending on the cluster configuration, it's not always possible/useful
to exploit locality.
> We should add a flag so that the feature can be optionally disabled.

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