[jira] [Commented] (HDFS-3275) Format command overwrites contents of non-empty shared edits dir if name dirs are empty without any prompting

["Uma Maheswara Rao G (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-3275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255614#comment-13255614 ] 

Uma Maheswara Rao G commented on HDFS-3275:
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I think we have to deal with protocol type and check the directory consistencies based on that. Currently, confirmation check will check only namespace dirs. 
To check the shared edits, we can not use this logic. We have to do it depending on the shared journal type. for: bk jouranal..etc

Also currently initialization of shareEditsDirs option also assumes that as file protocol. If we configure any other type it may not work.
                
> Format command overwrites contents of non-empty shared edits dir if name dirs are empty without any prompting
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3275
>                 URL: https://issues.apache.org/jira/browse/HDFS-3275
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha, name-node
>    Affects Versions: 2.0.0
>            Reporter: Vinithra Varadharajan
>            Assignee: amith
>
> To reproduce:
> # Configure a NameNode with namedirs and a shared edits dir, all of which are empty.
> # Run hdfs namenode -format. Namedirs and shared edits dir gets populated.
> # Delete the contents of the namedirs. Leave the shared edits dir as is. Check the timestamps of the shared edits dir contents.
> # Run format again. The namedirs as well as the shared edits dir get formatted. The shared edits dir's contents have been replaced without any prompting.

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