HLog sequence number is obtained outside updateLock
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Key: HBASE-2476
URL: https://issues.apache.org/jira/browse/HBASE-2476
Project: Hadoop HBase
Issue Type: Bug
Components: regionserver
Reporter: Todd Lipcon
Priority: Critical
In one of the overloads of HLog.append, obtainSeqNum() is called before
this.updateLock is acquired. This means that it's possible for some other
thread to have a higher sequence number but achieve its write first, and hence
the lastSeqWritten map can become incorrect.
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