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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 14:31:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16264399#comment-16264399
] 

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

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

    https://github.com/apache/flink/pull/4581#discussion_r152813899
  
    --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/io/network/partition/SpillableSubpartitionTest.java
---
    @@ -192,21 +198,39 @@ public void testConsumeSpilledPartition() throws Exception {
     
     		Buffer read = reader.getNextBuffer();
     		assertNotNull(read);
    +		assertNotSame(buffer, read);
    +		assertFalse(read.isRecycled());
     		read.recycle();
    +		assertTrue(read.isRecycled());
     
     		read = reader.getNextBuffer();
     		assertNotNull(read);
    +		assertNotSame(buffer, read);
    +		assertFalse(read.isRecycled());
     		read.recycle();
    +		assertTrue(read.isRecycled());
     
     		read = reader.getNextBuffer();
     		assertNotNull(read);
    +		assertNotSame(buffer, read);
    +		assertFalse(read.isRecycled());
     		read.recycle();
    +		assertTrue(read.isRecycled());
     
     		// End of partition
     		read = reader.getNextBuffer();
     		assertNotNull(read);
     		assertEquals(EndOfPartitionEvent.class, EventSerializer.fromBuffer(read, ClassLoader.getSystemClassLoader()).getClass());
    +		assertFalse(read.isRecycled());
     		read.recycle();
    +		assertTrue(read.isRecycled());
    +
    +		// finally check that the buffer has been freed after a successful (or failed) write
    --- End diff --
    
    no - this is why I added numerous more tests now :) thanks for pointing this out


> 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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