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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5966) Fix rollback of rolling upgrade in NameNode HA setup
Date Wed, 19 Feb 2014 14:40:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905501#comment-13905501

Tsz Wo (Nicholas), SZE commented on HDFS-5966:

Patch looks good.  A minor suggestion: add saveMD5File(File dataFile, String digestString)
to MD5FileUtils then both renameMD5File and the original saveMD5File can use it.

> Fix rollback of rolling upgrade in NameNode HA setup
> ----------------------------------------------------
>                 Key: HDFS-5966
>                 URL: https://issues.apache.org/jira/browse/HDFS-5966
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ha, hdfs-client, namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5966.000.patch
> This jira does the following:
> 1. When do rollback for rolling upgrade, we should call FSEditLog#initJournalsForWrite
when initializing editLog (just like Upgrade in HA setup).
> 2. After the rollback, we also need to rename the md5 file and change its reference file
> 3. Add a new unit test to cover rollback with HA+QJM

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