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From "seahigh (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-976) Hot Standby for NameNode
Date Tue, 01 Mar 2011 07:02:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000747#comment-13000747
] 

seahigh commented on HDFS-976:
------------------------------

I user hadoop-0.20.2, and had been trying to apply your patch, but always got compilation
errors.
How can I user this patch?
compile:
     [echo] contrib: highavailability
    [javac] Compiling 10 source files to /home/hadoop/hadoop-0.20.2/build/contrib/highavailability/classes
    [javac] /home/hadoop/hadoop-0.20.2/src/contrib/highavailability/src/java/org/apache/hadoop/hdfs/server/namenode/Standby.java:341:
cannot find symbol
    [javac] symbol  : method saveNamespace(boolean)
    [javac] location: class org.apache.hadoop.hdfs.server.namenode.FSImage
    [javac]       fsImage.saveNamespace(true);
    [javac]              ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 1 error

BUILD FAILED
/home/hadoop/hadoop-0.20.2/build.xml:497: The following error occurred while executing this
line:
/home/hadoop/hadoop-0.20.2/src/contrib/build.xml:30: The following error occurred while executing
this line:
/home/hadoop/hadoop-0.20.2/src/contrib/build-contrib.xml:133: Compile failed; see the compiler
error output for details.

> Hot Standby for NameNode
> ------------------------
>
>                 Key: HDFS-976
>                 URL: https://issues.apache.org/jira/browse/HDFS-976
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: Dmytro Molkov
>         Attachments: AvatarNode.20.patch, AvatarNode.patch, AvatarNodeDescription.txt,
AvatarPatch.2.patch
>
>
> This is a place holder to share our code and experiences about implementing a Hot Standby
for the HDFS NameNode for hadoop 0.20. 

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