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From "M. C. Srivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2413) Add public APIs for safemode
Date Sun, 09 Oct 2011 04:03:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123609#comment-13123609
] 

M. C. Srivas commented on HDFS-2413:
------------------------------------

This should be normal behavior part of all file-system ops.  It is not practical for a programmer
to wrap all file access calls (eg, write, mkdir, open) with "wait for NN to leave safemode".
                
> 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
>             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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