Kafka 0.9.0.1 Direct Memory OOM

[JsonTu]

Hi All,

We have a cluster with 6 nodes. we have meet a direct buffer memory OOM in our 
prod enviroment. Default config of Kafka’s JVM is used in our cluster.

some error is like below,

java.lang.OutOfMemoryError: Direct buffer memory

        at java.nio.Bits.reserveMemory(Bits.java:658)

        at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)

        at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:306)

        at sun.nio.ch.Util.getTemporaryDirectBuffer(Util.java:174)

        at sun.nio.ch.IOUtil.read(IOUtil.java:195)

        at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379)

        at 
org.apache.kafka.common.network.PlaintextTransportLayer.read(PlaintextTransportLayer.java:108)

        at 
org.apache.kafka.common.network.NetworkReceive.readFromReadableChannel(NetworkReceive.java:97)

        at 
org.apache.kafka.common.network.NetworkReceive.readFrom(NetworkReceive.java:71)

        at 
org.apache.kafka.common.network.KafkaChannel.receive(KafkaChannel.java:153)

        at 
org.apache.kafka.common.network.KafkaChannel.read(KafkaChannel.java:134)

        at org.apache.kafka.common.network.Selector.poll(Selector.java:286)

        at kafka.network.Processor.run(SocketServer.scala:413)

        at java.lang.Thread.run(Thread.java:745)




There are two suspicious place.

1、we have a topic have sent 100millions messages in one minute at that time，so 
I think whether this is may be the cause.

2、we have over 4000 close_wait socket on our broker.




Can someone help to analyse it. Thanks in advance.