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From "Bharat Viswanadham (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDDS-122) Issue with change of configuration ozone.metastore.impl in KSM
Date Fri, 25 May 2018 17:16:00 GMT

    [ https://issues.apache.org/jira/browse/HDDS-122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16491027#comment-16491027
] 

Bharat Viswanadham edited comment on HDDS-122 at 5/25/18 5:15 PM:
------------------------------------------------------------------

[~hanishakoneru] This is not duplicate of HDS-122, this is for the changes required in KSM
end for this.

-HDDS-12+1+- is targeted for SCM changes.

 


was (Author: bharatviswa):
[~hanishakoneru] This is not duplicate of HDS-121, this is for the changes required in KSM
end for this.

HDDS-122 is targeted for SCM changes.

 

>  Issue with change of configuration ozone.metastore.impl in KSM
> ---------------------------------------------------------------
>
>                 Key: HDDS-122
>                 URL: https://issues.apache.org/jira/browse/HDDS-122
>             Project: Hadoop Distributed Data Store
>          Issue Type: Bug
>            Reporter: Bharat Viswanadham
>            Assignee: Bharat Viswanadham
>            Priority: Major
>
> Take a scenario:
>  # When we started ozone cluster, I have set ozone.metastore.impl to RocksDB.
>  # Later I have stopped ozone cluster. 
>  # Changed the configuration of ozone.metastore.impl to LevelDB
> Now, when we restart we create KSM DB with a new DB type. With this, we will lose all
the information.
>  
> To avoid this kind of scenario, when we start KSM, we need to persist the DB used for KSM
into a VersionFile, and use this. In this way with later restarts, if we have a version file,
we read the dbType from Version file and use it for metadata store.
>  



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