Bug: Netty "leak detected" and OutOfDirectMemoryError due to direct memory buffering with SASL implementation
Status: Resolved | Priority: Blocker | Resolution: Fixed
Created: 25/Jan/22 18:36
Affects Version/s: 2.4.6

Under constant data ingestion, using default Netty based RpcServer and RpcClient implementation results in OutOfDirectMemoryError, supposedly caused by leaks detected by Netty's LeakDetector.
{code:java}
2022-01-25 17:03:10,084 ERROR [S-EventLoopGroup-1-3] util.ResourceLeakDetector - java:115)
  org.apache.hbase.thirdparty.io.netty.handler.codec.ByteToMessageDecoder.expandBTW. have you run the related test case?(ByteToMessageDecoder.java:538)
  org.apache.hbase.thirdparty.io.netty.handler.codec.ByteToMessageDecoder$1.cumulate(ByteToMessageDecoder.java:97)
  org.apache.hbase.thirdparty.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:274)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
  org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
  org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
  org.apache.hbase.thirdparty.io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:795)
  org.apache.hbase.thirdparty.io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:480)
  org.apache.hbase.thirdparty.io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
  org.apache.hbase.thirdparty.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
  org.apache.hbase.thirdparty.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
  org.apache.hbase.thirdparty.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
  java.lang.Thread.run(Thread.java:748)
 {code}
{code:java}
2022-01-25 17:03:14,014 ERROR [S-EventLoopGroup-1-3] util.ResourceLeakDetector - apache.hbase.thirdparty.io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
  org.apache.hbase.thirdparty.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
  org.apache.hbase.thirdparty.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
  org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
  org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
  org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
  org.apache.hbase.thirdparty.io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:795)
  org.apache.hbase.thirdparty.io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:480)
  org.apache.hbase.thirdparty.io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
  org.apache.hbase.thirdparty.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
  org.apache.hbase.thirdparty.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
  org.apache.hbase.thirdparty.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
  java.lang.Thread.run(Thread.java:748)
 {code}
And finally handlers are removed from the pipeline due to OutOfDirectMemoryError:
{code:java}
2022-01-25 17:36:28,657 WARN  [S-EventLoopGroup-1-5] 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.
org.apache.hbase.thirdparty.io.netty.channel.ChannelPipelineException: org.apache.hadoop.hbase.security.NettyHBaseSaslRpcClientHandler.handlerAdded() has thrown an exception; removed.
  at org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:624)
  at org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline.addFirst(DefaultChannelPipeline.java:181)
  at org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline.addFirst(DefaultChannelPipeline.java:358)
  at org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline.addFirst(DefaultChannelPipeline.java:339)
  at org.apache.hadoop.hbase.ipc.NettyRpcConnection.saslNegotiate(NettyRpcConnection.java:229)
  at org.apache.hadoop.hbase.ipc.NettyRpcConnection.access$600(NettyRpcConnection.java:79)
  at org.apache.hadoop.hbase.ipc.NettyRpcConnection$2.operationComplete(NettyRpcConnection.java:312)
  at org.apache.hadoop.hbase.ipc.NettyRpcConnection$2.operationComplete(NettyRpcConnection.java:300)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:571)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:550)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.setSuccess0(DefaultPromise.java:605)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104)
  at org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84)
  at org.apache.hbase.thirdparty.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.fulfillConnectPromise(AbstractEpollChannel.java:653)
  at org.apache.hbase.thirdparty.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.finishConnect(AbstractEpollChannel.java:691)
  at org.apache.hbase.thirdparty.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.epollOutReady(AbstractEpollChannel.java:567)
  at org.apache.hbase.thirdparty.io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:470)
  at org.apache.hbase.thirdparty.io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
  at org.apache.hbase.thirdparty.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
  at org.apache.hbase.thirdparty.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
  at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.hbase.thirdparty.io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216 byte(s) of direct memory (used: 33269220801, max: 33285996544)
  at org.apache.hbase.thirdparty.io.netty.util.internal.PlatformDependent.incrementMemoryCounter(PlatformDependent.java:802)
  at org.apache.hbase.thirdparty.io.netty.util.internal.PlatformDependent.allocateDirectNoCleaner(PlatformDependent.java:731)
  at org.apache.hbase.thirdparty.io.netty.buffer.PoolArena$DirectArena.allocateDirect(PoolArena.java:632)
  at org.apache.hbase.thirdparty.io.netty.buffer.PoolArena$DirectArena.newChunk(PoolArena.java:607)
  at org.apache.hbase.thirdparty.io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:202)
  at org.apache.hbase.thirdparty.io.netty.buffer.PoolArena.tcacheAllocateSmall(PoolArena.java:172)
  at org.apache.hbase.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:134)
  at org.apache.hbase.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:126)
  at org.apache.hbase.thirdparty.io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:395)
  at org.apache.hbase.thirdparty.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:187)
  at org.apache.hbase.thirdparty.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:178)
  at org.apache.hbase.thirdparty.io.netty.buffer.AbstractByteBufAllocator.buffer(AbstractByteBufAllocator.java:115)
  at org.apache.hadoop.hbase.security.NettyHBaseSaslRpcClientHandler.writeResponse(NettyHBaseSaslRpcClientHandler.java:79)
  at org.apache.hadoop.hbase.security.NettyHBaseSaslRpcClientHandler.handlerAdded(NettyHBaseSaslRpcClientHandler.java:115)
  at org.apache.hbase.thirdparty.io.netty.channel.AbstractChannelHandlerContext.callHandlerAdded(AbstractChannelHandlerContext.java:938)
  at org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:609)
  ... 24 more
 {code}