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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5159) Secondary NameNode fails to checkpoint if error occurs downloading edits on first checkpoint
Date Wed, 04 Sep 2013 03:39:52 GMT
Aaron T. Myers created HDFS-5159:
------------------------------------

             Summary: Secondary NameNode fails to checkpoint if error occurs downloading edits
on first checkpoint
                 Key: HDFS-5159
                 URL: https://issues.apache.org/jira/browse/HDFS-5159
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.1.0-beta
            Reporter: Aaron T. Myers
            Assignee: Aaron T. Myers


The 2NN will avoid downloading/loading a new fsimage if its local copy of fsimage is the same
as the version on the NN. However, the decision to *load* the fsimage from disk into memory
is based only on the on-disk fsimage version. If an error occurs between downloading and loading
the fsimage on the first checkpoint attempt, the 2NN will never load the fsimage, and then
on subsequent checkpoint attempts it will not load the on-disk fsimage and thus will never
checkpoint successfully.

Example error message in the first comment of this ticket.

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