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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11059) ZK-less region assignment
Date Mon, 09 Jun 2014 23:57:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14025946#comment-14025946
] 

Mikhail Antonov commented on HBASE-11059:
-----------------------------------------

[~jxiang] the performance improvement is pretty amazing! Let me look at the patch (I looked
at v1 before, I assume I can look v1->v3 now?)

bq. So that we can clean up quite some ZK assignment code in 2.0. In the meantime, we can
maintain a rolling upgrade path.
Do you think we could finish that transition in like 1.1 or it would have to wait till 2.0?

Also regarding release notes..I'd say that if we can't enforce that people migrate off ZK
during rolling upgrade (to be discussed more?), then at least it needs to be worded in release
notes in the way like it's _strictly_ advised thing to do, and a note that the old way will
be removed soon. What do you think?

> ZK-less region assignment
> -------------------------
>
>                 Key: HBASE-11059
>                 URL: https://issues.apache.org/jira/browse/HBASE-11059
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 0.99.0
>
>         Attachments: hbase-11059.patch, hbase-11059_v2.1.patch, hbase-11059_v2.patch,
zk-less_am.pdf
>
>
> It seems that most people don't like region assignment with ZK (HBASE-5487), which causes
many uncertainties. This jira is to support ZK-less region assignment. We need to make sure
this patch doesn't break backward compatibility/rolling upgrade.



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