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https://issues.apache.org/jira/browse/HBASE-19920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350991#comment-16350991
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Rohini Palaniswamy commented on HBASE-19920:
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bq. Do you want to submit a patch ?
No
>From my perspective, a call to get delegation token should not be
1) Creating a local directory
2) Instantiating a filesystem class be it local or remote. It is worse when
it is remote because of the overhead involved with instantiating a DFSClient
(opening sockets, etc).
I do not have a problem if DynamicClassLoader actually does those things when
the client intends to use coprocessors. Would just prefer it to be taken out of
the code path of getting delegation tokens.
> TokenUtil.obtainToken unnecessarily creates a local directory
> -------------------------------------------------------------
>
> Key: HBASE-19920
> URL: https://issues.apache.org/jira/browse/HBASE-19920
> Project: HBase
> Issue Type: Bug
> Reporter: Rohini Palaniswamy
> Priority: Major
>
> On client code, when one calls TokenUtil.obtainToken it loads ProtobufUtil
> which in its static block initializes DynamicClassLoader and that creates the
> directory ${hbase.rootdir}/lib
> https://github.com/apache/hbase/blob/master/hbase-common/src/main/java/org/apache/hadoop/hbase/util/DynamicClassLoader.java#L115-L127
> Since this is region server specific code, not expecting this to happen when
> one accesses hbase as a client.
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