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ASF GitHub Bot commented on FLINK-2076: --------------------------------------- Github user chiwanpark commented on the pull request: https://github.com/apache/flink/pull/751#issuecomment-107478713 I fixed the bug related to non-null memory segment. The bug was caused by non-clearing `writeBehindBuffersAvailable` variable in `close()` method of `MutableHashTable` class. I added a test case for this bug. I have a problem for creating a test case to test the bug related to null memory segment. I think that it is related to parallelism also. If I run ConnectedComponents example with parallelism 1, the bug not occurs. So I cannot reproduce the state without ConnectedComponents example. > Bug in re-openable hash join > ---------------------------- > > Key: FLINK-2076 > URL: https://issues.apache.org/jira/browse/FLINK-2076 > Project: Flink > Issue Type: Bug > Components: Local Runtime > Affects Versions: 0.9 > Reporter: Stephan Ewen > Assignee: Chiwan Park > > It happens deterministically in my machine with the following setup: > TaskManager: > - heap size: 512m > - network buffers: 4096 > - slots: 32 > Job: > - ConnectedComponents > - 100k vertices > - 1.2m edges > --> this gives around 260 m Flink managed memory, across 32 slots is 8MB per > slot, with several mem consumers in the job, makes the iterative hash join > out-of-core > {code} > java.lang.RuntimeException: Hash Join bug in memory management: > Memory buffers leaked. > at > org.apache.flink.runtime.operators.hash.MutableHashTable.buildTableFromSpilledPartition(MutableHashTable.java:733) > at > org.apache.flink.runtime.operators.hash.MutableHashTable.prepareNextPartition(MutableHashTable.java:508) > at > org.apache.flink.runtime.operators.hash.ReOpenableMutableHashTable.prepareNextPartition(ReOpenableMutableHashTable.java:167) > at > org.apache.flink.runtime.operators.hash.MutableHashTable.nextRecord(MutableHashTable.java:541) > at > org.apache.flink.runtime.operators.hash.NonReusingBuildSecondHashMatchIterator.callWithNextKey(NonReusingBuildSecondHashMatchIterator.java:102) > at > org.apache.flink.runtime.operators.AbstractCachedBuildSideMatchDriver.run(AbstractCachedBuildSideMatchDriver.java:155) > at > org.apache.flink.runtime.operators.RegularPactTask.run(RegularPactTask.java:496) > at > org.apache.flink.runtime.iterative.task.AbstractIterativePactTask.run(AbstractIterativePactTask.java:139) > at > org.apache.flink.runtime.iterative.task.IterationIntermediatePactTask.run(IterationIntermediatePactTask.java:92) > at > org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:362) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:560) > at java.lang.Thread.run(Thread.java:745) > {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)