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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11059) ZK-less region assignment
Date Tue, 10 Jun 2014 23:23:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027201#comment-14027201

Jeffrey Zhong commented on HBASE-11059:

2) When hbase.assignment.usezk is ON
Actually I mean  hbase.assignment.usezk is OFF(new mode) and PENDING_OPEN RIT state is stored
in META but real region open RPC may(or may not) sent out before master restarts. During master
starts I didn't see where we handle regions in PENDING_OPEN state from META.

 This seems to be an existing issue, right?
Before we offline region and then set FAILED_OPEN in ZK. This is likely a new behavior.

> 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_v2.2.patch,
hbase-11059_v2.patch, zk-less_am.pdf, zk-less_assignment.png
> 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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