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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3948) Enable A/B testing of scan iterators on a table
Date Thu, 12 Nov 2015 16:49:10 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15002391#comment-15002391
] 

ASF GitHub Bot commented on ACCUMULO-3948:
------------------------------------------

Github user dlmarion commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/51#discussion_r44681496
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/client/ScannerBase.java ---
    @@ -242,4 +242,30 @@
        * @since 1.8.0
        */
       long getBatchTimeout(TimeUnit timeUnit);
    +
    +  /**
    +   * Sets the name of the classloader context on this scanner
    --- End diff --
    
    And if the section number is added to the javadoc, who updates the javadoc in the future
versions of the code when the manual changes? I would think that if you want to use the class
loader context feature, then you have probably already read the section in the manual to understand
how to configure it.


> Enable A/B testing of scan iterators on a table
> -----------------------------------------------
>
>                 Key: ACCUMULO-3948
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3948
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>             Fix For: 1.8.0
>
>         Attachments: ACCUMULO-3948.1-6-3.patch, TestIterator.patch
>
>
> Classpath contexts are assigned to a table via the table configuration. You can test
at scale by cloning your table and assigning a new classpath context to the cloned table.
However, you would also need to change your application to use the new table names and since
we cannot disable compactions you would start to consume more space in the filesystem for
that table. We can support users passing in a context name to use for the scan on existing
tables. 



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