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https://issues.apache.org/jira/browse/HBASE-12035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14143558#comment-14143558
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Andrey Stepachev commented on HBASE-12035:
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bq. Are you suggesting that RS implement M protocol and it would answer
questions about table schema? That seems confusing.
We can make this methods part of RS interface instead of Master. Master
implements RS so it is master will have this methods too (but with different
implementation). We can add parameter 'noCache' which implies to bypass cache
and go directly to active master (if applicable).
> 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
> Reporter: Enis Soztutar
> Priority: Critical
> Fix For: 2.0.0
>
>
> 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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