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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7499) double buffer release in SpillableSubpartitionView
Date Thu, 23 Nov 2017 16:19:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16264557#comment-16264557
] 

ASF GitHub Bot commented on FLINK-7499:
---------------------------------------

Github user pnowojski commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4581#discussion_r152826521
  
    --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/io/network/partition/SpillableSubpartitionTest.java
---
    @@ -300,6 +315,230 @@ public void testConsumeSpillablePartitionSpilledDuringConsume()
throws Exception
     		assertTrue(buffer.isRecycled());
     	}
     
    +	/**
    +	 * Tests {@link SpillableSubpartition#add(Buffer)} with a spillable finished partition.
    +	 */
    +	@Test
    +	public void testAddOnFinishedSpillablePartition() throws Exception {
    +		SpillableSubpartition partition = createSubpartition();
    +		partition.finish();
    +
    +		Buffer buffer = new Buffer(MemorySegmentFactory.allocateUnpooledSegment(4096),
    +			FreeingBufferRecycler.INSTANCE);
    +		try {
    +			partition.add(buffer);
    +		} finally {
    --- End diff --
    
    ? Why does this test covers for both failure and normal paths? What if one of them never
happen?


> double buffer release in SpillableSubpartitionView
> --------------------------------------------------
>
>                 Key: FLINK-7499
>                 URL: https://issues.apache.org/jira/browse/FLINK-7499
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Network
>    Affects Versions: 1.2.0, 1.1.4, 1.3.0, 1.1.5, 1.2.1, 1.2.2, 1.3.1, 1.4.0, 1.3.2, 1.3.3
>            Reporter: Nico Kruber
>            Assignee: Nico Kruber
>            Priority: Blocker
>
> {{SpillableSubpartitionView#releaseMemory()}} recycles its buffers twice: once asynchronously
after the write operation and once in {{SpillableSubpartitionView#releaseMemory()}} after
adding the write operation to the queue.
> 1) if {{SpillableSubpartitionView#releaseMemory()}} hits first and the buffer is recycled,
the memory region may already be reused despite the pending write
> 2) If, for some reason (probably only in tests like {{SpillableSubpartitionTest#testConsumeSpillablePartitionSpilledDuringConsume()}}?),
the buffer is retained and to be used in parallel somewhere else it may also not be available
anymore or contain corrupt data.



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