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Posted to issues@tez.apache.org by "Rohini Palaniswamy (JIRA)" <ji...@apache.org> on 2015/11/18 23:58:10 UTC

[jira] [Created] (TEZ-2950) Poor performance of UnorderedPartitionedKVWriter

Rohini Palaniswamy created TEZ-2950:
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             Summary: Poor performance of UnorderedPartitionedKVWriter
                 Key: TEZ-2950
                 URL: https://issues.apache.org/jira/browse/TEZ-2950
             Project: Apache Tez
          Issue Type: Bug
            Reporter: Rohini Palaniswamy


Came across a job which was taking a long time in UnorderedPartitionedKVWriter.mergeAll. It was decompressing and reading data from spill files (8500 spills) and then writing the final compressed merge file. Why do we need spill files for UnorderedPartitionedKVWriter? Why not just buffer and keep directly writing to the final file which will save a lot of time.



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