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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2507) HA: Allow saveNamespace operations to be canceled
Date Fri, 28 Oct 2011 01:51:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137834#comment-13137834
] 

Hudson commented on HDFS-2507:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #874 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/874/])
    HDFS-2507. Allow saveNamespace operations to be canceled. Contributed by Todd Lipcon.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1190060
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormat.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SaveNamespaceCancelledException.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SaveNamespaceContext.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/MD5FileUtils.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSaveNamespace.java

                
> HA: Allow saveNamespace operations to be canceled
> -------------------------------------------------
>
>                 Key: HDFS-2507
>                 URL: https://issues.apache.org/jira/browse/HDFS-2507
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: HA branch (HDFS-1623), 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623), 0.24.0
>
>         Attachments: hdfs-2507.txt
>
>
> For HDFS-2291 (checkpointing in HA setup) we need to allow the StandbyNode to handle
a failover while it may be in the middle of saving a checkpoint. This implies that checkpoints
need to be abortable.
> This JIRA is to implement this functionality. Even though this is only needed for HA,
I think we should do the infrastructure in trunk to simplify future merges.

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