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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 18:54:11 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15002631#comment-15002631
] 

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_r44697949
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/client/ConditionalWriterConfig.java
---
    @@ -133,4 +137,39 @@ public int getMaxWriteThreads() {
       public Durability getDurability() {
         return durability;
       }
    +
    +  /**
    +   * Sets the name of the classloader context on this scanner. See the administration
chapter of the user manual for details on how to configure and use
    +   * classloader contexts.
    +   *
    +   * @param classLoaderContext
    +   *          name of the classloader context
    +   * @throws NullPointerException
    +   *           if context is null
    +   * @since 1.8.0
    +   */
    +  public void setClassLoaderContext(String classLoaderContext) {
    +    Preconditions.checkNotNull(classLoaderContext, "context name cannot be null");
    +    this.classLoaderContext = classLoaderContext;
    +  }
    +
    +  /**
    +   * Clears the current classloader context set on this scanner
    +   *
    +   * @since 1.8.0
    +   */
    +  public void clearClassLoaderContext() {
    --- End diff --
    
    AFAICT this is not used in a test.  A test that scans w/ a context, clears the context,
and then scans again would be nice.


> 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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