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https://issues.apache.org/jira/browse/HBASE-12035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302588#comment-14302588
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Andrey Stepachev commented on HBASE-12035:
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[~stack] Thank you for looking at this patch.
As for CellComparator I think it should work, lexicographically table row will
be before region rows. I checked, and hope all scans set catalog family
explicitly, so they shouldn't see table row if they don't expect them.
As for branch-1 it can be ever simplier, because there is no protobuf and
table descriptors still the same.
Migration can be made in TableStateManager, it can read states from zk and
update meta accordingly.
If we don't want to support states in zk (that could break some apps, that are
rely state in zk instead),
we can make migration. If we want to keep things compatible, that would be a
bit more work to support
zkwatcher and state duplication to zk (may be with configuration property like
'enable.zk.state.compat')
> 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-12035.patch, HBASE-12035.patch, HBASE-12035.patch, HBASE-12035.patch,
> 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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