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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1815) Separate client and server jars
Date Thu, 30 Aug 2007 18:04:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12523902
] 

Doug Cutting commented on HADOOP-1815:
--------------------------------------

> we faced this problem while using distcp [ ...]

Ah.  I think one could make a case for a hadoop-user jar, that includes standard, supported
stuff, like distcp, aggregate, etc., that's not part of the kernel, and should hence not be
included in the kernel's jar that's used on servers.  A clean way to do this would be to use
a separate source tree.  So we might split src/java into src/sys and src/user, and replace
hadoop-core.jar with hadoop-sys.jar and hadoop-user.jar.  Some client-side stuff, like DFSClient
and JobClient, would still be in the kernel jar, so the split wouldn't be client/server but
rather user/system.  Could that work?

Alternately, we could move such things into src/contrib, which is already built as separate
jars and only contains user code.  In any case, we should attempt to minimize what's in the
system jar file to avoid problems like this.

> Separate client and server jars
> -------------------------------
>
>                 Key: HADOOP-1815
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1815
>             Project: Hadoop
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 0.14.0
>         Environment: All
>            Reporter: Milind Bhandarkar
>             Fix For: 0.15.0
>
>
> For the ease of deployment, one should not have to change the server jars, and restart
clusters, when minor features on the client side are changed. This requireds separating client
and server jars for hadoop. Version numbers appended to hadoop jars can reflect the compatibility.
e.g. the server jar could be at 0.13.1, and the client jar could be at 0.13.2. In short, we
can treat the part following 0. as the "major" version number for now.
> This allows major client frameworks such as streaming and Pig happy. To my knowledge,
Pig uses hadoop's default jobclient. Whereas streaming uses its own jobclient. I would love
to change streaming to use the default hadoop jobclient, if I can make modifications to it
(e.g. to print more stats that are available from TaskReport, for example), if I do not have
to deploy the new version of the whole jar to the backend and restart the mapreduce cluster.
> (I thought there was already a bug filed for separating the client and server jar, but
I could not find it. Hence the new Jira. Sorry about duplication, if any.)

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