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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2720) HA : TestStandbyIsHot is failing while copying in_use.lock file from NN1 nameSpaceDirs to NN2 nameSpaceDirs
Date Thu, 29 Dec 2011 20:58:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177389#comment-13177389
] 

Eli Collins commented on HDFS-2720:
-----------------------------------

ATM and I were discussing how to initialize the SBN state yesterday. What we currently do
is format the primary then copy the name dirs to the SBN. How about making the SBN do this
automatically on startup? Specifically, on NN startup, if HA and a shared edits dir are configured,
if there is no local image but the shared-dir is configured then the SBN downloads the image
from the primary (if the other NN is still standby then it fails to start as it does currently).
                
> HA : TestStandbyIsHot is failing while copying in_use.lock file from NN1 nameSpaceDirs
to NN2 nameSpaceDirs 
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-2720
>                 URL: https://issues.apache.org/jira/browse/HDFS-2720
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, test
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>         Attachments: HDFS-2720.patch
>
>
> To maintain the clusterID same , we are copying the namespaceDirs from 1st NN to other
NNs.
> While copying this files, in_use.lock file may not allow to copy in all the OSs since
it has aquired the lock on it. 

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