Connection reset by peer

[Gyula Fóra]

Hi guys,

I have a Flink Streaming job running for about a day now without any errors
and then I got this in the job manager log:

15:37:49,905 WARN  io.netty.channel.DefaultChannelPipeline
          - An exceptionCaught() event was fired, and it reached at
the tail of the pipeline. It usually means the last handler in the
pipeline did not handle the exception.
java.io.IOException: Connection reset by peer
        at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
        at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
        at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
        at sun.nio.ch.IOUtil.read(IOUtil.java:192)
        at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
        at 
io.netty.buffer.UnpooledUnsafeDirectByteBuf.setBytes(UnpooledUnsafeDirectByteBuf.java:447)
        at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:881)
        at 
io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:242)
        at 
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
        at 
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
        at 
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
        at 
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
        at 
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
        at 
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
        at java.lang.Thread.run(Thread.java:745)


After this the job did not fail it keeps running. This happened twice.
Can anyone tell me what might cause this exception?


Cheers,

Gyula