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From "Bill Graham (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3436) HBase start scripts should not include maven repos jars if they exist in lib
Date Tue, 11 Jan 2011 19:22:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12980273#action_12980273
] 

Bill Graham commented on HBASE-3436:
------------------------------------

I'm don't recall running mvn install, but I do see this jar in my maven repos:

~/.m2/repository/org/apache/hadoop/hadoop-core/0.20-append-r1042285/hadoop-core-0.20-append-r1042285.jar

Which is the same one that is packaged the HBase lib/ dir. What I recall is doing the following:

1. Downloading the HBase tar and extracting it
2. Modifying some configs and running it from by home dir
3. Copying the distro with custom configs to /var/opt/habase, where we now run it.

I'm not sure how the append jar got to my maven repo, but maybe I ran some target within HBase
that put it there? I suspect my target/cached_classpath.txt file came along for the ride in
step 3 above.

Either way, I've deleted the cached_classpath file and I can no longer reproduce, meaning
I can't manage to get the maven jars into my classpath when starting/stoping the master. This
is a good thing.

Feel free to mark this issue as invalid if it seems like something I might have done. We should
try to make this maven/classpath functionality more obvious though, since I was hung up on
this for a long time. Maybe better log messaging that these classes are being inserted into
the cp would help. 


> HBase start scripts should not include maven repos jars if they exist in lib
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-3436
>                 URL: https://issues.apache.org/jira/browse/HBASE-3436
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Bill Graham
>            Priority: Critical
>             Fix For: 0.90.1
>
>
> When starting the master, the jars of the users maven repos get injected into the classpath
as a convenience to developers. This can cause quite a debugging headache when hadoop jars
don't match what's on the cluster.
> We should change the start scripts to not do this if the jars exist in the lib dir. Or
better yet, we would only include maven repos jars if an optional param exists in hbase-env.sh.

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