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