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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1936) ClassLoader that loads from hdfs; useful adding filters to classpath without having to restart services
Date Fri, 12 Apr 2013 23:00:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630724#comment-13630724
] 

Jimmy Xiang commented on HBASE-1936:
------------------------------------

Yes, that's right. The reason for the rolling restart is to unload the old version. If you
just add some new filters to the existing jar file even the jar file name is the same, you
don't need rolling restart.

It will be helpful if we can unload an old version class. However, this means we need to track
where the class is loaded, and when the jar file is changed, to avoid performance issue. We
also need to come up a way to unload a class in this scenario, which is not trivial.
                
> ClassLoader that loads from hdfs; useful adding filters to classpath without having to
restart services
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1936
>                 URL: https://issues.apache.org/jira/browse/HBASE-1936
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: stack
>            Assignee: Jimmy Xiang
>              Labels: noob
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: 0.94-1936.patch, cp_from_hdfs.patch, HBASE-1936-trunk(forReview).patch,
trunk-1936.patch, trunk-1936_v2.1.patch, trunk-1936_v2.2.patch, trunk-1936_v2.patch, trunk-1936_v3.patch
>
>


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