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Posted to dev@giraph.apache.org by "Alessandro Presta (JIRA)" <ji...@apache.org> on 2013/01/09 20:34:15 UTC

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

Alessandro Presta created GIRAPH-477:
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             Summary: 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


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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