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  1. WildFly
  2. WFLY-4790

Getting DirectBuffer OOM when sending fragmented binary message to websocket endpoint

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      When sending fragmented binary message (message with message payload of length 4 * 2**20 (4M). Sent out in fragments of 64). The server throws java.lang.OutOfMemoryError: Direct buffer memory [1]

      The memory for direct buffer by default depends on the size set by -Xmx, which is in EAP 7.0.0.DR4 by default set to -Xmx512m. Increasing it just increases the time before the limit is hit (it is enough to send those messages multiple times to hit the limit again).

      I believe the issue is similar to the one for EAP 6.4: https://bugzilla.redhat.com/show_bug.cgi?id=1223708

      [1]

      15:10:55,463 ERROR [org.xnio.listener] (default I/O-1) XNIO001007: A channel event listener threw an exception: 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:311)
      	at org.xnio.BufferAllocator$2.allocate(BufferAllocator.java:57)
      	at org.xnio.BufferAllocator$2.allocate(BufferAllocator.java:55)
      	at org.xnio.ByteBufferSlicePool.allocate(ByteBufferSlicePool.java:143)
      	at io.undertow.websockets.core.BufferedBinaryMessage$1.handleEvent(BufferedBinaryMessage.java:106)
      	at io.undertow.websockets.core.BufferedBinaryMessage$1.handleEvent(BufferedBinaryMessage.java:97)
      	at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
      	at io.undertow.server.protocol.framed.AbstractFramedStreamSourceChannel$1.run(AbstractFramedStreamSourceChannel.java:264)
      	at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:560)
      	at org.xnio.nio.WorkerThread.run(WorkerThread.java:462)
      

              sdouglas1@redhat.com Stuart Douglas (Inactive)
              rhatlapa@redhat.com Radim Hatlapatka (Inactive)
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                Created:
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