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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5384) Add a new TransitionState to indicate NN is in transition from standby state to active state
Date Sat, 02 May 2015 04:35:08 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524726#comment-14524726
] 

Hadoop QA commented on HDFS-5384:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | patch |   0m  0s | The patch command could not apply the patch during
dryrun. |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12609503/HDFS-5384.001.patch
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| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f1a152c |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/10576/console |


This message was automatically generated.

> Add a new TransitionState to indicate NN is in transition from standby state to active
state
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5384
>                 URL: https://issues.apache.org/jira/browse/HDFS-5384
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, namenode
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5384.000.patch, HDFS-5384.001.patch
>
>
> Currently in HA setup, when a NameNode is transitioning from standby to active, the current
code first sets the state of the NN to Active, then starts the active service, during which
the NN still needs to tail the remaining editlog and may not be able to serve certain requests
as expected (such as HDFS-5322). 
> So it may be necessary to define a transition state to indicate that NN has left the
previous state and is in transitioning to the next state.



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