[jira] Commented: (HBASE-1816) Master rewrite

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779207#action_12779207 ] 

stack commented on HBASE-1816:
------------------------------

More work on design: http://wiki.apache.org/hadoop/Hbase/MasterRewrite.  At Patrick Hunt's prompting, will have a znode per table up in zk to hold schema and state (rather than one znode to hold all).  Also, carried forward Patrick's suggestion for how to keep region state.  It involves a flip on previous notion where online regions were in .META. somehow and zk just managed unassigned to open.  Instead, .META. lists all regions.  zk holds moving regions from unassigned -- i.e. mentioned in .META. but not in zk -- through to online (online is a state in zk).

> Master rewrite
> --------------
>
>                 Key: HBASE-1816
>                 URL: https://issues.apache.org/jira/browse/HBASE-1816
>             Project: Hadoop HBase
>          Issue Type: Task
>          Components: master
>            Reporter: stack
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: HBase Hackathon Notes - Sunday.pdf, master-v2.patch, master-v3.patch, master-v4.patch, master.patch, meta-cleanup.patch
>
>
> An umbrella issue for master rewrite.  Master rewrite is a new feature for 0.21 hbase.  I'm attaching "Master Rewrite" notes taken at the SU SF hbase meetup made by JGray.

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