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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8127) NameNode Failover during HA upgrade can cause DataNode to finalize upgrade
Date Tue, 14 Apr 2015 05:03:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14493563#comment-14493563

Jing Zhao commented on HDFS-8127:

Thanks for the review, Nicholas!

bq. BootstrapStandby may format shared directories since storage.format(..) will format all
directories including the shared directories. This is an existing bug

I think the shared dir will not be formatted here, because {{editUrisToFormat}} only contains
local dirs.

I will update the patch to address your other comments and fix the failed unit tests. 

> NameNode Failover during HA upgrade can cause DataNode to finalize upgrade
> --------------------------------------------------------------------------
>                 Key: HDFS-8127
>                 URL: https://issues.apache.org/jira/browse/HDFS-8127
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.4.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>            Priority: Blocker
>         Attachments: HDFS-8127.000.patch
> Currently for HA upgrade (enabled by HDFS-5138), we use {{-bootstrapStandby}} to initialize
the standby NameNode. The standby NameNode does not have the {{previous}} directory thus it
does not know that the cluster is in the upgrade state. If NN failover happens, as response
of block reports, the new ANN will tell DNs to finalize the upgrade thus make it impossible
to rollback again.

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