Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/14961
Still saw the following errors in the unit-test log:
```
16/09/13 07:41:18.817 shuffle-server-466-7 WARN TransportChannelHandler:
Exception in connection from /127.0.0.1:36871
io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216
byte(s) of direct memory (used: 3120562176, max: 3132096512)
at
io.netty.util.internal.PlatformDependent.incrementMemoryCounter(PlatformDependent.java:528)
at
io.netty.util.internal.PlatformDependent.allocateDirectNoCleaner(PlatformDependent.java:482)
at
io.netty.buffer.PoolArena$DirectArena.allocateDirect(PoolArena.java:688)
at io.netty.buffer.PoolArena$DirectArena.newChunk(PoolArena.java:677)
at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:237)
at io.netty.buffer.PoolArena.allocate(PoolArena.java:213)
at io.netty.buffer.PoolArena.allocate(PoolArena.java:141)
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:611)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:552)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:466)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
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)
```
Seems the error cannot be reported correctly in Jenkins.
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