Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/17180#discussion_r114619730
--- Diff:
core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java ---
@@ -358,10 +358,20 @@ public long spill(long numBytes) throws IOException {
return 0L;
}
+ long released = 0L;
+ // longArray will not be used anymore, but may take significant
amount of memory
+ // but never released until the task is complete.
--- End diff --
This line seems to explain the behavior of current code (before applying
this PR). It would be good to explain the behavior of the new code.
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