GitHub user liutang123 opened a pull request:
https://github.com/apache/spark/pull/20184
[SPARK-22987][Core] UnsafeExternalSorter cases OOM when invoking
`getIterator` function.
## What changes were proposed in this pull request?
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.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liutang123/spark SPARK-22987
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20184.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20184
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commit d57ce865729ce4d0d84a0fee0edf4dd6febe54bc
Author: liutang123 <liutang123@...>
Date: 2018-01-08T04:33:51Z
[SPARK-22987][Core] UnsafeExternalSorter cases OOM when invoking
`getIterator` function.
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