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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8607) Run HBase server in an OSGi container
Date Fri, 31 May 2013 23:33:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671896#comment-13671896
] 

James Taylor commented on HBASE-8607:
-------------------------------------

My thinking is that an OSGi container would allow a new version of a coprocessor (and/or custom
filter) jar to be loaded. Class conflicts between the old jar and the new jar would no longer
be a problem - you'd never need to unload the old jar. Instead, future HBase operations that
invoke the coprocessor would cause the newly loaded jar to be used instead of the older one.
I'm not sure if this is possible or not. The whole idea would be to prevent a rolling restart
or region close/reopen.
                
> Run HBase server in an OSGi container
> -------------------------------------
>
>                 Key: HBASE-8607
>                 URL: https://issues.apache.org/jira/browse/HBASE-8607
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>            Reporter: James Taylor
>
> Run the HBase server in an OSGi container to support updating custom filters and coprocessor
updates without requiring a region server reboot. Typically, applications that use coprocessors
and custom filters also have shared classes underneath, so putting the burden on the user
to include some kind of version name in the class is not adequate. Including the version name
in the package might work in some cases (at least until dependent jars start to change as
well), but is cumbersome and overburdens the app developer.

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