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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5920) Support rollback of rolling upgrade in NameNode and JournalNodes
Date Wed, 12 Feb 2014 22:12:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899661#comment-13899661

Suresh Srinivas commented on HDFS-5920:

Looks like you are waiting for HDFS-5889 to finish the TODOs in this patch.
# nit: "discard unnecessary editlog" -> "discard unnecessary editlog segments"
# nit: trashEditlog() - better name could be discardEditLogSegments() - method javadoc could
say instead of delete, "Discard editlog segments by renaming them with suffix .trash"?
# "it should be the first txid of some segment" -> "it should be the first txid of some
segment, if segment corresponding to the txid exists"

> Support rollback of rolling upgrade in NameNode and JournalNodes
> ----------------------------------------------------------------
>                 Key: HDFS-5920
>                 URL: https://issues.apache.org/jira/browse/HDFS-5920
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: journal-node, namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5920.000.patch, HDFS-5920.000.patch, HDFS-5920.001.patch
> This jira provides rollback functionality for NameNode and JournalNode in rolling upgrade.
> Currently the proposed rollback for rolling upgrade is:
> 1. Shutdown both NN
> 2. Start one of the NN using "-rollingUpgrade rollback" option
> 3. This NN will load the special fsimage right before the upgrade marker, then discard
all the editlog segments after the txid of the fsimage
> 4. The NN will also send RPC requests to all the JNs to discard editlog segments. This
call expects response from all the JNs. The NN will keep running if the call succeeds.
> 5. We start the other NN using bootstrapstandby rather than "-rollingUpgrade rollback"

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