[jira] [Created] (HAMA-756) Timing issue and file merging algorithm in PartitioningRunner make job fail

["MaoYuan Xian (JIRA)" <ji...@apache.org>]

MaoYuan Xian created HAMA-756:
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             Summary: Timing issue and file merging algorithm in PartitioningRunner make job fail
                 Key: HAMA-756
                 URL: https://issues.apache.org/jira/browse/HAMA-756
             Project: Hama
          Issue Type: Bug
            Reporter: MaoYuan Xian
            Assignee: MaoYuan Xian


There are two major problems in bsp methor of PartitioningRunner may make the partitioning fail:
1. The call to peer.getNumPeers() may trigger the timing issue. In the special situation when some tasks complete the bsp call but some others just enter the "for (FileStatus statu : status)" loop, these remaining task calling to peer.getNumPeers() will trigger the problem.
2. The algorithm of merging the sequence files has the problem: e.g. when desiredNum is 8 and partitioning task number (peer.getNumPeers()) is 6, the part-7 directory can not find the handler to merging it as a file.


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Re: [jira] [Created] (HAMA-756) Timing issue and file merging algorithm in PartitioningRunner make job fail

[Edward <ed...@udanax.org>]

If I remerber correctly, 1) is solved by calling sync().

Sent from my iPhone

On May 10, 2013, at 12:49 PM, "MaoYuan Xian (JIRA)" <ji...@apache.org> wrote:

> trigger the timing issue. In the special situation when some tasks complete the bsp call but some others just enter the "for (FileStatus statu : status)" loop, these remaining task calling to peer.getNumPeers() will trigger the problem.