[ https://issues.apache.org/jira/browse/SPARK-15391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Davies Liu reassigned SPARK-15391: ---------------------------------- Assignee: Davies Liu > 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 > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org