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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2397) Undeprecate SecondaryNameNode
Date Tue, 24 Jan 2012 06:31:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191931#comment-13191931
] 

Hudson commented on HDFS-2397:
------------------------------

Integrated in Hadoop-Common-trunk-Commit #1577 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1577/])
    HDFS-2397. Undeprecate SecondaryNameNode. Contributed by Eli Collins

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1235135
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/docs/src/documentation/content/xdocs/commands_manual.xml
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/docs/src/documentation/content/xdocs/hdfs_user_guide.xml
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SecondaryNameNode.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCheckpoint.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameEditsConfigs.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecondaryWebUi.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestStartup.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestStorageRestore.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-site/src/site/apt/ClusterSetup.apt.vm

                
> Undeprecate SecondaryNameNode
> -----------------------------
>
>                 Key: HDFS-2397
>                 URL: https://issues.apache.org/jira/browse/HDFS-2397
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.22.0, 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Eli Collins
>         Attachments: hdfs-2397.txt, hdfs-2397.txt, hdfs-2397.txt, hdfs-2397.txt
>
>
> I would like to consider un-deprecating the SecondaryNameNode for 0.23, and amending
the documentation to indicate that it is still the most trust-worthy way to run checkpoints,
and while CN/BN may have some advantages, they're not battle hardened as of yet. The test
coverage for the 2NN is far superior to the CheckpointNode or BackupNode, and people have
a lot more production experience. Indicating that it is deprecated before we have expanded
test coverage of the CN/BN won't send the right message to our users. (For comparison, look
at what a mess we got into by prematurely deprecating the "old" MR API before the "new" API
had feature parity and a few versions of bug fixes).

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