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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 17:20:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292118#comment-14292118
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Andrey Stepachev commented on HBASE-12035:
------------------------------------------

btw, keeping state in meta only will lead to all tables enabled on meta rebuild (unless we
add some command line argument to specify table states or make hbck able to sideline table
status info into some place where it can be read while hbase is offline, or we can read meta
offline and get states from there)

> 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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