Rohini Palaniswamy commented on HBASE-19920:

bq. Do you want to submit a patch ?

>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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