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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 Sat, 02 Mar 2013 22:17:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591545#comment-13591545

Jonathan Hsieh commented on HBASE-7965:

I'm assuming right now we are in the gathering state since the feature and usage isn't complete
in trunk yet?  This won't happen until it is basically done there first right?

bq. At this stage, there is no hbck support for fixing a table lock, but if deadlock happens,
the user can just delete the lock znodes. Plus, I am proposing to backport this as disabled
by default. All the lock operations are no-op if disabled, no critical code path will be affected
by default. If needed, we can say that this feature is experimental in 0.94.

These are perfect things release notes.  (how to clean up if stuck)

Disabled by default helps allay my concerns quite a bit, and a general case way to make these
things less scary.

bq. I think I've went to some details of how I did test these in HBASE-7305 and HBASE-7546
and the RB for those. I'll consolidate the testing effort here.

A summary here would be great -- I've done a read of the code, the jira, and the pdf but didn't
look at rb comments.  Hopefully there some kill tests?

bq. The set of patches has nothing to do with the wire protocol. I don't see your concern

It isn't just wire protocol -- any data that is serialized and written to zk is a compatibility
concern.  We've had zk-related compat problem in the past.  (most recently between 0.92 and
0.94).  These are all new znodes so sounds reasonable.

> 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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