[jira] Created: (HBASE-2476) HLog sequence number is obtained outside updateLock

["Todd Lipcon (JIRA)" <ji...@apache.org>]

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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