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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 20:58:11 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15002915#comment-15002915
] 

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

Github user keith-turner commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/51#discussion_r44713365
  
    --- Diff: shell/src/main/java/org/apache/accumulo/shell/commands/ScanCommand.java ---
    @@ -316,6 +323,7 @@ public Options getOptions() {
             "time before scan should fail if no data is returned. If no unit is given assumes
seconds.  Units d,h,m,s,and ms are supported.  e.g. 30s or 100ms");
         outputFileOpt = new Option("o", "output", true, "local file to write the scan output
to");
         sampleOpt = new Option(null, "sample", false, "Show sample");
    +    contextOpt = new Option("cc", "context", true, "name of the classloader context");
    --- End diff --
    
    Could add a test for this option ShellServerIT


> 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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