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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