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https://issues.apache.org/jira/browse/SPARK-18971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956209#comment-15956209
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Shixiong Zhu commented on SPARK-18971:
--------------------------------------
It's not backported because there are two many changes in the new Netty version
and it's too risky to upgrade in a maintenance release.. We may backport it to
2.1 if we don't see any regression after Spark 2.2.0 is released.
> Netty issue may cause the shuffle client hang
> ---------------------------------------------
>
> Key: SPARK-18971
> URL: https://issues.apache.org/jira/browse/SPARK-18971
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
> Priority: Minor
> Fix For: 2.2.0
>
>
> Check https://github.com/netty/netty/issues/6153 for details
> You should be able to see the following similar stack track in the executor
> thread dump.
> {code}
> "shuffle-client-7-4" daemon prio=5 tid=97 RUNNABLE
> at io.netty.util.Recycler$Stack.scavengeSome(Recycler.java:504)
> at io.netty.util.Recycler$Stack.scavenge(Recycler.java:454)
> at io.netty.util.Recycler$Stack.pop(Recycler.java:435)
> at io.netty.util.Recycler.get(Recycler.java:144)
> at
> io.netty.buffer.PooledUnsafeDirectByteBuf.newInstance(PooledUnsafeDirectByteBuf.java:39)
> at
> io.netty.buffer.PoolArena$DirectArena.newByteBuf(PoolArena.java:727)
> at io.netty.buffer.PoolArena.allocate(PoolArena.java:140)
> at
> io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:271)
> at
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:177)
> at
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:168)
> at
> io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:129)
> at
> io.netty.channel.AdaptiveRecvByteBufAllocator$HandleImpl.allocate(AdaptiveRecvByteBufAllocator.java:104)
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:117)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:652)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:575)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:489)
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:451)
> at
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:140)
> at
> io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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