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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4617) warning while purging logs with QJM enabled
Date Wed, 20 Mar 2013 05:53:15 GMT
Todd Lipcon created HDFS-4617:

             Summary: warning while purging logs with QJM enabled
                 Key: HDFS-4617
                 URL: https://issues.apache.org/jira/browse/HDFS-4617
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha, namenode
    Affects Versions: 2.0.3-alpha
            Reporter: Todd Lipcon

HDFS-2946 changed the way that edit log purging is calculated, such that it calls selectInputStreams()
with an arbitrary transaction ID calculated relative to the current one. The JournalNodes
will reject such a request if that transaction ID falls in the middle of a segment (which
it usually will). This means that selectInputStreams gets an exception, and the QJM journal
manager is not included in this calculation. Additionally, a warning will be logged.

Purging itself still happens, because the detailed information on remote logs is not necessary
to calculate a retention interval, but the feature from HDFS-2946 may not work as intended.

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