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https://issues.apache.org/jira/browse/HBASE-19920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16353157#comment-16353157
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Ted Yu commented on HBASE-19920:
--------------------------------

Looks good overall.
{code}
+   * @return IOException wrapped in ServiceException.
{code}
The above is backwards, right (ServiceException wrapped in IOException) ?
{code}
+      TokenUtil.obtainToken(null);
+    } catch (Exception e) {
{code}
Since exception is expected, you can add assert(false) following 
TokenUtil.obtainToken() in the try block.

> 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
>            Assignee: Mike Drob
>            Priority: Major
>             Fix For: 2.0
>
>         Attachments: HBASE-19920.patch, HBASE-19920.v2.patch, 
> HBASE-19920.v3.patch
>
>
> On client code, when one calls TokenUtil.obtainToken it loads ProtobufUtil 
> which in its static block initializes DynamicClassLoader and that creates the 
> directory ${hbase.local.dir}/jars/ and also instantiates a filesystem class 
> to access hbase.dynamic.jars.dir.
> https://github.com/apache/hbase/blob/master/hbase-common/src/main/java/org/apache/hadoop/hbase/util/DynamicClassLoader.java#L109-L127
> Since this is region server specific code, not expecting this to happen when 
> one accesses hbase as a client.



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