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https://issues.apache.org/jira/browse/FLINK-9860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546159#comment-16546159
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Chesnay Schepler commented on FLINK-9860:
-----------------------------------------
we should double-check whether this also applies to 1.5.1.
> 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: 1.6.0
> Reporter: Till Rohrmann
> Assignee: Nico Kruber
> Priority: Blocker
> Labels: test-stability
> Fix For: 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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