Wellington Chevreuil created HBASE-22539:
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Summary: 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
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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