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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3653) 1.x: Add a retention period for purged edit logs
Date Fri, 13 Jul 2012 00:24:34 GMT
Todd Lipcon created HDFS-3653:

             Summary: 1.x: Add a retention period for purged edit logs
                 Key: HDFS-3653
                 URL: https://issues.apache.org/jira/browse/HDFS-3653
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 1.1.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon

Occasionally we have a bug which causes something to go wrong with edits files. Even more
occasionally the bug is such that the namenode mistakenly deletes an {{edits}} file without
merging it into {{fsimage}} properly -- e.g if the bug mistakenly writes an OP_INVALID at
the top of the log.

In trunk/2.0 we retain many edit log segments going back in time to be more robust to this
kind of error. I'd like to implement something similar (but much simpler) in 1.x, which would
be used only by HDFS developers in root-causing or repairing from these rare scenarios: the
NN should never directly delete an edit log file. Instead, it should rename the file into
some kind of "trash" directory inside the name dir, and associate it with a timestamp. Then,
periodically a separate thread should scan the trash dirs and delete any logs older than a
configurable time.

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