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Posted to issues@spark.apache.org by "Sital Kedia (JIRA)" <ji...@apache.org> on 2017/03/18 22:35:41 UTC

[jira] [Created] (SPARK-20014) Optimize mergeSpillsWithFileStream method

Sital Kedia created SPARK-20014:
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             Summary: Optimize mergeSpillsWithFileStream method
                 Key: SPARK-20014
                 URL: https://issues.apache.org/jira/browse/SPARK-20014
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.0.0
            Reporter: Sital Kedia


When the individual partition size in a spill is small, mergeSpillsWithTransferTo method does many small disk ios which is really inefficient. One way to improve the performance will be to use mergeSpillsWithFileStream method by turning off transfer to and using buffered file read/write to improve the io throughput. 
However, the current implementation of mergeSpillsWithFileStream does not do a buffer read/write of the files and in addition to that it unnecessarily opens/close the output files for each partitions.  



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