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From "Alessandro Presta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-477) Fetching locality info in InputSplitPathOrganizer causes jobs to hang
Date Wed, 09 Jan 2013 19:34:15 GMT
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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