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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3438) BootstrapStandby should not require a rollEdits on active node
Date Sat, 19 May 2012 11:44:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279528#comment-13279528
] 

Hudson commented on HDFS-3438:
------------------------------

Integrated in Hadoop-Hdfs-trunk #1050 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1050/])
    HDFS-3438. BootstrapStandby should not require a rollEdits on active node. Contributed
by Todd Lipcon. (Revision 1340343)

     Result = SUCCESS
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1340343
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/protocolPB/NamenodeProtocolServerSideTranslatorPB.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/NamenodeProtocolTranslatorPB.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/BootstrapStandby.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/NamenodeProtocol.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/NamenodeProtocol.proto
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestBootstrapStandby.java

                
> BootstrapStandby should not require a rollEdits on active node
> --------------------------------------------------------------
>
>                 Key: HDFS-3438
>                 URL: https://issues.apache.org/jira/browse/HDFS-3438
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 2.0.1
>
>         Attachments: hdfs-3438.txt
>
>
> Currently, BootstrapStandby uses a rollEdits() call on the active NN in order to determine
the most recent checkpoint and transaction ID. However, this means that you cannot bootstrap
a standby when the active NN is in safe mode -- i.e you have to start the whole cluster before
you can bootstrap a new standby. This makes the workflow to convert an existing cluster to
HA more complicated. We should allow BootstrapStandby to work even when the NN is in safe
mode.

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