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From "Victor Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9645) Regionserver halt because of HLog's "Logic Error Snapshot seq id from earlier flush still present!"
Date Tue, 24 Sep 2013 10:29:04 GMT
Victor Xu created HBASE-9645:
--------------------------------

             Summary: Regionserver halt because of HLog's "Logic Error Snapshot seq id from
earlier flush still present!"
                 Key: HBASE-9645
                 URL: https://issues.apache.org/jira/browse/HBASE-9645
             Project: HBase
          Issue Type: Bug
          Components: regionserver, wal
    Affects Versions: 0.94.10
         Environment: Linux 2.6.32-el5.x86_64
            Reporter: Victor Xu
            Priority: Critical


I upgrade my hbase cluster to 0.94.10 three weeks ago, and this case happened several days
after that. I change the bug's priority to 'Critical' because every  time it happens, a regionserver
halt down. All of them have the same log:

ERROR org.apache.hadoop.hbase.regionserver.wal.HLog: Logic Error Snapshot seq id from earlier
flush still present! for region c0d88db4ce3606842fbec9d34c38f707 overwritten oldseq=80114270537with
new seq=80115066829

I check the code finding that it locates at HLog.startCacheFlush method. The 'lastSeqWritten'
has been locked. Maybe something wrong happened outside the HLog that change it by mistake.

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