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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9860) Netty resource leak on receiver side
Date Wed, 18 Jul 2018 13:16:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16547819#comment-16547819
] 

ASF GitHub Bot commented on FLINK-9860:
---------------------------------------

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

    https://github.com/apache/flink/pull/6363#discussion_r203373280
  
    --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/rest/FileUploadHandlerTest.java
---
    @@ -50,6 +55,24 @@
     
     	private static final ObjectMapper OBJECT_MAPPER = RestMapperUtils.getStrictObjectMapper();
     
    +	private static ResourceLeakDetectorFactory previousLeakDetector;
    +	private static ResourceLeakDetector.Level previousLeakDetectorLevel;
    +
    +	@BeforeClass
    +	public static void setLeakDetector() {
    --- End diff --
    
    we could move this into a utility `LeakDetectorResource` so we can re-use it for any test
by simply adding it as a `@Rule`.


> Netty resource leak on receiver side
> ------------------------------------
>
>                 Key: FLINK-9860
>                 URL: https://issues.apache.org/jira/browse/FLINK-9860
>             Project: Flink
>          Issue Type: Bug
>          Components: Network
>    Affects Versions: 1.5.1, 1.6.0
>            Reporter: Till Rohrmann
>            Assignee: Nico Kruber
>            Priority: Blocker
>              Labels: pull-request-available, test-stability
>             Fix For: 1.5.2, 1.6.0
>
>
> The Hadoop-free Wordcount end-to-end test fails with the following exception:
> {code}
> ERROR org.apache.flink.shaded.netty4.io.netty.util.ResourceLeakDetector  - LEAK: ByteBuf.release()
was not called before it's garbage-collected. See http://netty.io/wiki/reference-counted-objects.html
for more information.
> Recent access records: 
> Created at:
> 	org.apache.flink.shaded.netty4.io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:331)
> 	org.apache.flink.shaded.netty4.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:185)
> 	org.apache.flink.shaded.netty4.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:176)
> 	org.apache.flink.shaded.netty4.io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:137)
> 	org.apache.flink.shaded.netty4.io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114)
> 	org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:147)
> 	org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)
> 	org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
> 	org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
> 	org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
> 	org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
> 	org.apache.flink.shaded.netty4.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> {code}
> We might have a resource leak on the receiving side of our network stack.
> https://api.travis-ci.org/v3/job/404225956/log.txt



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