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From "Dave Marion (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3948) Enable A/B testing of scan iterators on a table
Date Wed, 29 Jul 2015 13:15:04 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14646018#comment-14646018
] 

Dave Marion commented on ACCUMULO-3948:
---------------------------------------

Another use of this feature would be to support rolling upgrades of a client application.
Having two versions of an application running against the same table at the same time, using
different versions of scan iterators. MinC and MajC iterators would still use the context
name applied to the table via the table configuration.

> 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
>
> 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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