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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7976) Rest of master operations (move, assign, unassign, offline region) should also acquire table locks
Date Sat, 02 Mar 2013 12:05:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591395#comment-13591395
] 

nkeywal commented on HBASE-7976:
--------------------------------

I don't have the whole picture, but we need to pay a real attention to the performances. Assignment
is on the critical path for recovery. ZooKeeper is an expensive beast, it's a network call
+ a HD sync: it can't be worse. And it can become overloaded as anyone (it doesn't scale that
much). We use it only if we have to. Sorry for being generic, I go trough the doc but didn't
get where you want to put it.
                
> Rest of master operations (move, assign, unassign, offline region) should also acquire
table locks
> --------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7976
>                 URL: https://issues.apache.org/jira/browse/HBASE-7976
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.95.0, 0.98.0
>
>
> HBASE-7305 adds table locks to the create/delete/enable/disable/modify table and column
operations. We should also acquire the table lock in region admin operations, move, assign,
unassign, etc. 

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