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From "Lance Norskog (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1352) DIH: MultiThreaded
Date Sun, 03 Jan 2010 02:41:54 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12795939#action_12795939
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Lance Norskog commented on SOLR-1352:
-------------------------------------

In the future, especially with multi-threaded operations, the DIH will benefit from converting
to immutable objects wherever possible.
 I have used this technique on a few multithreaded projects and it has really helped:
http://codeidol.com/java/effective-java/Processing/Item-38-Favor-the-immutable,-for-it-needs-no-locks/

("Effective Enterprise Java" is one my favorite system architecture books.)



> DIH: MultiThreaded
> ------------------
>
>                 Key: SOLR-1352
>                 URL: https://issues.apache.org/jira/browse/SOLR-1352
>             Project: Solr
>          Issue Type: Improvement
>          Components: contrib - DataImportHandler
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>             Fix For: 1.5
>
>         Attachments: SOLR-1352.patch, SOLR-1352.patch, SOLR-1352.patch
>
>
> It has been a long pending request to make DIH multithreaded. Now that we have implemented
most of the features , the next best thing we can aim for is performance. DIH should be able
to take advantage of multiple cores in a box .I expect the configuration to be as follows
> {code:xml}
> <entity name="foo" threads="4">
> <!--more stuff goes here-->
> </entity>
> {code}
> at the entity where the threads is specified it should fork into multiple threads. If
the threads<2 it executes w/o forking. In debug mode it automatically becomes singlethreaded.

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