[jira] Updated: (HBASE-1621) merge tool should work on online cluster, but disabled table

["Jean-Daniel Cryans (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Daniel Cryans updated HBASE-1621:
--------------------------------------

    Attachment: HBASE-1621.patch

Here's an initial implementation for online merging, along with a unit test. I tested it on a small table in a small cluster, worked as advertised. There's currently no rollbacking so if anything happens during the merge then the 2 regions will stay OFFLINE which means that you need to disable/enable the table to get them back.

Based off branch.

> merge tool should work on online cluster, but disabled table
> ------------------------------------------------------------
>
>                 Key: HBASE-1621
>                 URL: https://issues.apache.org/jira/browse/HBASE-1621
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ryan rawson
>             Fix For: 0.21.0
>
>         Attachments: HBASE-1621.patch
>
>
> taking down the entire cluster to merge 2 regions is a pain, i dont see why the table or regions specifically couldnt be taken offline, then merged then brought back up.
> this might need a new API to the regionservers so they can take direction from not just the master.

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