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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7965) Port table locking to 0.94 (HBASE-7305, HBASE-7546, HBASE-7933)
Date Fri, 01 Mar 2013 22:13:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590997#comment-13590997
] 

Jonathan Hsieh commented on HBASE-7965:
---------------------------------------

As much as I like the locking mechanisms, I'm concerned about backporting them to a stable
release.  Some questions I have in mind are:

# Adding locks prevents races, but could enable deadlocks.  We've lived with these races for
a long time (at least since 0.90) and basically understand them.  This is a fundamentally
different failure scenario and has me worried. 
# This is going to affect a vital path (can't use hbase if you can't create tables).  I'd
honestly like some evidence (a story!) about some long running tests with fault injection
using this mechanism.  This will go a long way to allaying my concerns.
# What is the rolling upgrade story (0.94.5 -> 0.94.7).  Does cause any incompatibilities?


                
> Port table locking to 0.94 (HBASE-7305, HBASE-7546, HBASE-7933)
> ---------------------------------------------------------------
>
>                 Key: HBASE-7965
>                 URL: https://issues.apache.org/jira/browse/HBASE-7965
>             Project: HBase
>          Issue Type: New Feature
>          Components: master, Zookeeper
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.94.7
>
>
> Port table locking to 0.94 (HBASE-7305, HBASE-7546, HBASE-7933). This is a new feature,
but there has been some interest, and it is necessary for snapshots, and online merge, which
are also candidates for backport. 
> If we port snapshots, we might need HBASE-7848 as well.
> We can also do disabled by default.

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