stack created HTRACE-256:
----------------------------

             Summary: Change the artifactId for htrace-core in branch 4.0 to be 
htrace-core4
                 Key: HTRACE-256
                 URL: https://issues.apache.org/jira/browse/HTRACE-256
             Project: HTrace
          Issue Type: Bug
            Reporter: stack
         Attachments: 256.patch

Incompatible artifactId change so can have htrace 3.2 and htrace 4.0 on same 
CLASSPATH. Examples of where we need this are an hbase updated to use 4.0 APIs 
but using an HDFS that has the old APIs or, inside in htrace itself, the 
htrace-hbase module can't be updated to hbase 1.0.0 because hbase 1.0.0 is on 
htrace 3.2.

With a different artifactId and different package names, no possibility of 
NoClassDefFound.



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