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https://issues.apache.org/jira/browse/HBASE-22370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16833896#comment-16833896
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Zheng Hu commented on HBASE-22370:
----------------------------------
That should be a serious bug. Checked all the allocations from
ByteBufAllocator, I guess that the memory leak happened in some exceptional
path, because seems we did not handle ByteBuf#release perfectly when in
exception path. Did you find any more ERROR log or Exception before ?
> AsyncFSWAL ByteBuf LEAK ERROR
> -----------------------------
>
> Key: HBASE-22370
> URL: https://issues.apache.org/jira/browse/HBASE-22370
> Project: HBase
> Issue Type: Bug
> Reporter: binlijin
> Priority: Major
>
> We do failover test and throw a leak error, this is hard to reproduce.
> {code}
> 2019-05-06 02:30:27,781 ERROR [AsyncFSWAL-0] util.ResourceLeakDetector: LEAK:
> ByteBuf.release() was not called before it's garbage-collected. See
> http://netty.io/wiki/reference-counted-objects.html for more information.
> Recent access records:
> Created at:
>
> org.apache.hbase.thirdparty.io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:334)
>
> org.apache.hbase.thirdparty.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:187)
>
> org.apache.hbase.thirdparty.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:178)
>
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutput.flush0(FanOutOneBlockAsyncDFSOutput.java:494)
>
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutput.flush(FanOutOneBlockAsyncDFSOutput.java:513)
>
> org.apache.hadoop.hbase.regionserver.wal.AsyncProtobufLogWriter.sync(AsyncProtobufLogWriter.java:144)
> org.apache.hadoop.hbase.regionserver.wal.AsyncFSWAL.sync(AsyncFSWAL.java:353)
>
> org.apache.hadoop.hbase.regionserver.wal.AsyncFSWAL.consume(AsyncFSWAL.java:536)
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> java.lang.Thread.run(Thread.java:748)
> {code}
>
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