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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5074) Allow starting up from an fsimage checkpoint in the middle of a segment
Date Tue, 06 Aug 2013 20:07:48 GMT
Todd Lipcon created HDFS-5074:
---------------------------------

             Summary: Allow starting up from an fsimage checkpoint in the middle of a segment
                 Key: HDFS-5074
                 URL: https://issues.apache.org/jira/browse/HDFS-5074
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha, namenode
    Affects Versions: 3.0.0, 2.1.0-beta
            Reporter: Todd Lipcon


We've seen the following behavior a couple times:
- SBN is running and somehow encounters an error in the middle of replaying an edit log in
the tailer (eg the JN it's reading from crashes)
- SBN successfully has processed half of the edits in the segment it was reading.
- SBN saves a checkpoint, which now falls in the middle of a segment, and then restarts

Upon restart, the SBN will load this checkpoint which falls in the middle of a segment. {{selectInputStreams}}
then fails when the SBN requests a mid-segment txid.

We should handle this case by downloading the right segment and fast-forwarding to the correct
txid.

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