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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1568) Make configuration changes Atomic
Date Tue, 01 Oct 2013 16:19:24 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13783095#comment-13783095
] 

John Vines commented on ACCUMULO-1568:
--------------------------------------

Did the namespace configs get wrapped? I'll work on this, but I don't want to make merging
that code a PITA.

> Make configuration changes Atomic
> ---------------------------------
>
>                 Key: ACCUMULO-1568
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1568
>             Project: Accumulo
>          Issue Type: Bug
>            Reporter: Keith Turner
>            Assignee: John Vines
>             Fix For: 1.6.0
>
>
> I have not seen this issue, but its something I thought of.  Assume the following happens.
>  * iterators I1 ... I10 are configured to Table T1 at time 1
>  * iterators NI1 ... NI10 are configured to Table T1 at time 2
>  * compaction is reading iterator config and reads I1 ... I5  and NI4 ... NI9, a combination
of the two iterator configurations w/o NI10, this could be really bad.
> Seems like this could be solved by use of Zookeeper transactions.   The Accumulo API
will need to change to allow setting many iterators or config settings at once.
>  
>  



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