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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8217) Port online region merge (HBASE-7403) to 0.94
Date Fri, 29 Mar 2013 01:35:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616960#comment-13616960
] 

Enis Soztutar commented on HBASE-8217:
--------------------------------------

Thanks Elliot for the comments. All valid converns. Let me try to show my view: 
bq. I feel very strongly that it's incorrect to add new non bug fix code to 0.94.
This has been discussed a couple of times previously. The argument boils down to: 0.96 was
targeted for fall last year, but having the next 0.96 GA will take another 2-3 months it seems.
As in snapshots, and other issues, it depends on whether people really care about this feature
or not. 
bq. This is experimental in trunk.
We will mark this as experimental as well. But this will allow us to test it better and get
it rock solid. 
bq. There a lot of edge cases.
These cases are hopefully covered by the patch. Obviously, doing merge while doing rolling
upgrades won't work, but that is expected. You cannot merge regions having ref files. 
bq. merging while schema edits
Same problem with splits. That is why online schema alter is disabled by default.
bq. Users have gotten by without this for a long time; for me this really suggests that the
need for this in an old version is pretty low.
Not sure about it. It looks like, since we did not support it, users had to work around it.

Again, these are valid concerns and if we cannot get enough interest, I'll close this as won't
fix. I still think that there is merit to having this in. 
                
> Port online region merge (HBASE-7403) to 0.94
> ---------------------------------------------
>
>                 Key: HBASE-8217
>                 URL: https://issues.apache.org/jira/browse/HBASE-8217
>             Project: HBase
>          Issue Type: New Feature
>          Components: master, Region Assignment, regionserver
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.94.7
>
>         Attachments: hbase-8217_v2.patch
>
>
> HBASE-7403 added online region merge, and there was some discussion about whether we
can port this to 0.94. 
> In this issue, we can discuss feasibility and decide one what way or the other. I actually
have a patch on top of backported HBASE-7721. 

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