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From "Andrey Stepachev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12035) Client does an RPC to master everytime a region is relocated
Date Mon, 26 Jan 2015 11:50:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291739#comment-14291739
] 

Andrey Stepachev commented on HBASE-12035:
------------------------------------------

some sum-up:
1. moving state into meta - that is good.
2. removing state from hdfs - thats to not keep one thing twice, considered good
3. moving htd to meta - ? is that good? We can lighting hdfs and master hits with that, but
that is not obvious is it need to be lightened.
4. keep eventual copy of htd in meta, but primary copy in hdfs - seem lead to complication
and ambiguous behaviour.

So, I'm going to drop 3 and 4 and do 1 and 2. 
Or moving htd to meta is not so bad as it looks like? Any thoughts?

> Client does an RPC to master everytime a region is relocated
> ------------------------------------------------------------
>
>                 Key: HBASE-12035
>                 URL: https://issues.apache.org/jira/browse/HBASE-12035
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client, master
>    Affects Versions: 2.0.0
>            Reporter: Enis Soztutar
>            Assignee: Andrey Stepachev
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-12035.patch, HBASE-12035.patch, HBASE-12035.patch
>
>
> HBASE-7767 moved table enabled|disabled state to be kept in hdfs instead of zookeeper.
isTableDisabled() which is used in HConnectionImplementation.relocateRegion() now became a
master RPC call rather than a zookeeper client call. Since we do relocateRegion() calls everytime
we want to relocate a region (region moved, RS down, etc) this implies that when the master
is down, the some of the clients for uncached regions will be affected. 
> See HBASE-7767 and HBASE-11974 for some more background. 



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