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https://issues.apache.org/jira/browse/FLINK-8893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16391045#comment-16391045
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Stephan Ewen commented on FLINK-8893:
-------------------------------------
[~NicoK] [~till.rohrmann] This would be an argument for bumping the Netty
version.
> NPE when netty try to allocate directBuffer
> -------------------------------------------
>
> Key: FLINK-8893
> URL: https://issues.apache.org/jira/browse/FLINK-8893
> Project: Flink
> Issue Type: Bug
> Components: Network
> Affects Versions: 1.3.2
> Reporter: aitozi
> Priority: Blocker
>
> Job failed with this exception
> {code:java}
> Caused by: java.lang.NullPointerException
> at io.netty.buffer.PoolChunk.initBufWithSubpage(PoolChunk.java:381)
> at io.netty.buffer.PoolChunk.initBufWithSubpage(PoolChunk.java:369)
> at io.netty.buffer.PoolArena.allocate(PoolArena.java:194)
> at io.netty.buffer.PoolArena.allocate(PoolArena.java:132)
> at
> io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:271)
> at
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:155)
> at
> io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:146)
> at
> org.apache.flink.runtime.io.network.netty.NettyBufferPool.directBuffer(NettyBufferPool.java:278)
> at
> org.apache.flink.runtime.io.network.netty.NettyMessage.allocateBuffer(NettyMessage.java:72)
> at
> org.apache.flink.runtime.io.network.netty.NettyMessage.access$000(NettyMessage.java:50)
> at
> org.apache.flink.runtime.io.network.netty.NettyMessage$BufferResponse.write(NettyMessage.java:227)
> ... 26 more
> {code}
> After research, this may be caused by allocate from muti-thread.
> https://github.com/netty/netty/issues/4198
> https://github.com/netty/netty/pull/4388
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