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Posted to dev@giraph.apache.org by "Alessandro Presta (JIRA)" <ji...@apache.org> on 2013/01/09 21:04:12 UTC

[jira] [Updated] (GIRAPH-477) Fetching locality info in InputSplitPathOrganizer causes jobs to hang

     [ https://issues.apache.org/jira/browse/GIRAPH-477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alessandro Presta updated GIRAPH-477:
-------------------------------------

    Attachment: GIRAPH-477.patch

This patch adds a flag to optionally disable storing locality info and fetching it from ZK.
                
> 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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