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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11059) ZK-less region assignment
Date Tue, 10 Jun 2014 23:37:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027221#comment-14027221
] 

Jimmy Xiang commented on HBASE-11059:
-------------------------------------

bq. During master starts I didn't see where we handle regions in PENDING_OPEN state from META.
I see. We should send the RPC again for both PENDING_OPEN and PENDING_CLOSE at master start
in case failover.

bq. Before we offline region and then set FAILED_OPEN in ZK. This is likely a new behavior.
I added the offline region part. I mean the race is an existing issue. With ZK, RS can set
FAILED_OPEN in ZK, before clean up the RS internal memory state, the master could handle the
FAILED_OPEN ZK event and try to open the region on the same RS again and get back already
opened. There seems not to have an easy fix. Probably a little synchronization is needed.
Perhaps we can address this one in a separate issue.

> 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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