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https://issues.apache.org/jira/browse/HBASE-22539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855721#comment-16855721
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Duo Zhang commented on HBASE-22539:
-----------------------------------
Oh, good, this is a nasty bug and seems we are about to reach the root cause.
So the solution is to switch back from NettyRpcServer to SimpleRpcServer? So we
will not pass cells with DBB?
> Potential WAL corruption due to Unsafe.copyMemory usage when DBB are in place
> -----------------------------------------------------------------------------
>
> Key: HBASE-22539
> URL: https://issues.apache.org/jira/browse/HBASE-22539
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.1.1
> Reporter: Wellington Chevreuil
> Priority: Blocker
>
> Summary
> We had been chasing a WAL corruption issue reported on one of our customers
> deployments running release 2.1.1 (CDH 6.1.0). After providing a custom
> modified jar with the extra sanity checks implemented by HBASE-21401 applied
> on some code points, plus additional debugging messages, we believe it is
> related to DirectByteBuffer usage, and Unsafe copy from offheap memory to
> on-heap array triggered
> [here|https://github.com/apache/hbase/blob/branch-2.1/hbase-common/src/main/java/org/apache/hadoop/hbase/util/ByteBufferUtils.java#L1157],
> such as when writing into a non ByteBufferWriter type, as done
> [here|https://github.com/apache/hbase/blob/branch-2.1/hbase-common/src/main/java/org/apache/hadoop/hbase/io/ByteBufferWriterOutputStream.java#L84].
> More details on the following comment.
>
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