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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2413) Add public APIs for safemode
Date Tue, 18 Oct 2011 05:34:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13129508#comment-13129508
] 

Uma Maheswara Rao G commented on HDFS-2413:
-------------------------------------------

Harsh, This will really help in other systems also as you mention above.
 I remember one case in HIVE also, when starting the hive it needs to creates some table in
HDFS and derby related to metastore. If NN is in safe mode, it used to fail the creatione
of tables in dfs and succeeds in derby. Because of this partial table table creations, it
shows metastore as currupt and fails the startup. 

Thanks
Uma 

                
> Add public APIs for safemode
> ----------------------------
>
>                 Key: HDFS-2413
>                 URL: https://issues.apache.org/jira/browse/HDFS-2413
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Harsh J
>             Fix For: 0.23.0
>
>
> Currently the APIs for safe-mode are part of DistributedFileSystem, which is supposed
to be a private interface. However, dependent software often wants to wait until the NN is
out of safemode. Though it could poll trying to create a file and catching SafeModeException,
we should consider making some of these APIs public.

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