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https://issues.apache.org/jira/browse/SPARK-15391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Davies Liu resolved SPARK-15391.
--------------------------------
Resolution: Fixed
Fix Version/s: 2.0.0
Issue resolved by pull request 13318
[https://github.com/apache/spark/pull/13318]
> Spark executor OOM during TimSort
> ---------------------------------
>
> Key: SPARK-15391
> URL: https://issues.apache.org/jira/browse/SPARK-15391
> Project: Spark
> Issue Type: Bug
> Reporter: Sital Kedia
> Assignee: Davies Liu
> Fix For: 2.0.0
>
>
> While running a query, we are seeing a lot of executor OOM while doing
> TimSort.
> Stack trace -
> {code}
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeSortDataFormat.allocate(UnsafeSortDataFormat.java:86)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeSortDataFormat.allocate(UnsafeSortDataFormat.java:32)
> at
> org.apache.spark.util.collection.TimSort$SortState.ensureCapacity(TimSort.java:951)
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeLo(TimSort.java:699)
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeAt(TimSort.java:525)
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeCollapse(TimSort.java:453)
> at
> org.apache.spark.util.collection.TimSort$SortState.access$200(TimSort.java:325)
> at org.apache.spark.util.collection.TimSort.sort(TimSort.java:153)
> at org.apache.spark.util.collection.Sorter.sort(Sorter.scala:37)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.getSortedIterator(UnsafeInMemorySorter.java:235)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.spill(UnsafeExternalSorter.java:198)
> at org.apache.spark.memory.MemoryConsumer.spill(MemoryConsumer.java:58)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.insertRecord(UnsafeExternalSorter.java:356)
> at
> org.apache.spark.sql.execution.UnsafeExternalRowSorter.insertRow(UnsafeExternalRowSorter.java:91)
> {code}
> Out of total 32g available to the executors, we are allocating 24g onheap and
> 8g onheap memory. Looking at the code
> (https://github.com/apache/spark/blob/master/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSortDataFormat.java#L87),
> we see that during TimSort we are allocating the memory buffer onheap
> irrespective of memory mode that is reason of executor OOM.
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