[jboss-jira] [JBoss JIRA] (WFLY-4790) Getting DirectBuffer OOM when sending fragmented binary message to websocket endpoint

[Radim Hatlapatka (JIRA)]

     [ https://issues.jboss.org/browse/WFLY-4790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Radim Hatlapatka updated WFLY-4790:
-----------------------------------
    Fix Version/s: 10.0.0.Alpha6
                       (was: 10.0.0.Beta1)


> Getting DirectBuffer OOM when sending fragmented binary message to websocket endpoint
> -------------------------------------------------------------------------------------
>
>                 Key: WFLY-4790
>                 URL: https://issues.jboss.org/browse/WFLY-4790
>             Project: WildFly
>          Issue Type: Bug
>          Components: Web (Undertow)
>    Affects Versions: 10.0.0.Alpha3
>            Reporter: Radim Hatlapatka
>            Assignee: Stuart Douglas
>            Priority: Critical
>             Fix For: 10.0.0.Alpha6
>
>
> 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]
> {noformat}
> 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)
> {noformat}



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