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From "Dave Marion (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-708) Modify ClassLoader to support different applications / multi-tenancy
Date Thu, 08 Nov 2012 23:46:12 GMT


Dave Marion commented on ACCUMULO-708:

bq. •use general prefix for new config properties. general denotes its a configuration for
all services (i.e. master, tserver, etc)

  I'll include in another patch, I'll wait for your other comments and roll all the changes
up into a new patch.

bq. •needs documentation. How does a user know this feature exists and what they can do
with it?

  Where should this be documented? User guide, readme, etc?

bq. •probably should not use org/apache/commons/vfs2 package. If the commons project defines
classes with same name and user loads Accumulo and Commons jar chaos could ensue.

  Understood. I know for a fact that these classes don't collide with ones in Commons VFS.
Code has also been submitted to VFS for inclusion in a
future release (VFS-442).

bq. •I noticed there were a few accumulo site files introduced. Are these for testing? Some
of them configured walog dirs which is no longer nesc in 1.5.

  These are there for tests. I believe I copied the 512MB example site file and modified for
my tests. The walog property is not used and the test will not fail if the directory does
not exist as the servers are not started during the tests.

> Modify ClassLoader to support different applications / multi-tenancy
> --------------------------------------------------------------------
>                 Key: ACCUMULO-708
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: start
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>              Labels: classloader
>             Fix For: 1.5.0
>         Attachments: ACCUMULO-708-1.patch
>   Original Estimate: 24h
>          Time Spent: 33h
>  Remaining Estimate: 0h
> I'd like to expand the current classloader to support loading classes from HDFS and different
application contexts. I'll be modifying the ticket as the idea matures.

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