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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4298) StorageRetentionManager spews warnings when used with QJM
Date Wed, 22 May 2013 17:25:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664279#comment-13664279

Todd Lipcon commented on HDFS-4298:

ok, +1 pending Jenkins on the new patch
> StorageRetentionManager spews warnings when used with QJM
> ---------------------------------------------------------
>                 Key: HDFS-4298
>                 URL: https://issues.apache.org/jira/browse/HDFS-4298
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0, 2.0.3-alpha
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-4298.patch, HDFS-4298.patch, HDFS-4298.patch
> When the NN is configured with a QJM, we see the following warning message every time
a checkpoint is made or uploaded:
> 12/12/10 16:07:52 WARN namenode.FSEditLog: Unable to determine input streams from QJM
to [,,]. Skipping.
> org.apache.hadoop.hdfs.qjournal.client.QuorumException: Got too many exceptions to achieve
quorum size 2/3. 3 exceptions thrown:
> Asked for firstTxId 114837 which is in the middle of file /tmp/jn-2/myjournal/current/edits_0000000000000095185-0000000000000114846
> ...
> This is because, since HDFS-2946, the NN calls {{selectInputStreams}} to determine the
number of log segments and put a cap on the number. This API throws an exception in the case
of QJM if the argument falls in the middle of an edit log boundary.

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