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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5999) Do not create rollback fsimage when it already exists
Date Sun, 23 Feb 2014 00:39:24 GMT
Jing Zhao created HDFS-5999:
-------------------------------

             Summary: Do not create rollback fsimage when it already exists
                 Key: HDFS-5999
                 URL: https://issues.apache.org/jira/browse/HDFS-5999
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Jing Zhao
            Assignee: Jing Zhao


Currently in FSEditLogLoader#applyEditLogOp, if the op is OP_START_LOG_SEGMENT, we do an extra
rollback fsimage with condition "totalEdits > 1".

This may cause some issue when we restart a NN with new software. If there is no extra checkpoint
after the rollback image, the NN may generate a new rollback image using the new software,
and replace the old rollback image. Then later if we want to do rollback the NN, which uses
the old software, may not be able to load the rollback image.



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