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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2794) HA: Active NN may purge edit log files before standby NN has a chance to read them
Date Tue, 07 Feb 2012 12:58:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202336#comment-13202336
] 

Hudson commented on HDFS-2794:
------------------------------

Integrated in Hadoop-Hdfs-HAbranch-build #71 (See [https://builds.apache.org/job/Hadoop-Hdfs-HAbranch-build/71/])
    HDFS-2794. Active NN may purge edit log files before standby NN has a chance to read them.
Contributed by Todd Lipcon.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1241317
Files : 
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NNStorageRetentionManager.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNNStorageRetentionFunctional.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNNStorageRetentionManager.java

                
> HA: Active NN may purge edit log files before standby NN has a chance to read them
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-2794
>                 URL: https://issues.apache.org/jira/browse/HDFS-2794
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: hdfs-2794.txt, hdfs-2794.txt
>
>
> Given that the active NN is solely responsible for purging finalized edit log segments,
and given that the active NN has no way of knowing when the standby reads edit logs, it's
 possible that the standby NN could fail to read all edits it needs before the active purges
the files.

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