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Posted to issues@spark.apache.org by "Lijia Liu (JIRA)" <ji...@apache.org> on 2018/01/08 04:12:00 UTC

[jira] [Created] (SPARK-22987) UnsafeExternalSorter cases OOM when invoking `getIterator` function.

Lijia Liu created SPARK-22987:
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             Summary: UnsafeExternalSorter cases OOM when invoking `getIterator` function.
                 Key: SPARK-22987
                 URL: https://issues.apache.org/jira/browse/SPARK-22987
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.2.1, 2.2.0
            Reporter: Lijia Liu


ChainedIterator.UnsafeExternalSorter remains a Queue of UnsafeSorterIterator. When call `getIterator` function of UnsafeExternalSorter, UnsafeExternalSorter passes an ArrayList of UnsafeSorterSpillReader to the constructor of UnsafeExternalSorter. But, UnsafeSorterSpillReader maintains a byte array as buffer, witch capacity is more than 1 MB. When spilling frequently, this case maybe causes OOM.

I try to change the Queue in ChainedIterator to a Iterator. 



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