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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3738) Restore a trace class for Hive to work
Date Thu, 16 Apr 2015 19:27:59 GMT
Josh Elser created ACCUMULO-3738:
------------------------------------

             Summary: Restore a trace class for Hive to work
                 Key: ACCUMULO-3738
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3738
             Project: Accumulo
          Issue Type: Task
          Components: trace
            Reporter: Josh Elser
            Assignee: Josh Elser
             Fix For: 1.7.0


Shame on me that I let HIVE-9082 slip through a couple of releases.

Backstory: Hive (Pig does this too) has some nice code lifted from HBase which accepts some
Java class and figures out the jar which contains that class (which is on the classpath) and
then adds that jar as a necessary dependency for the query execution (e.g. libjars for mapreduce).

The problem is that when I did the Hive stuff, I chose a bad class: trace/src/main/java/org/apache/accumulo/trace/instrument/Tracer.java.
This went away in the HTrace switchover. Because Hive has had a few releases since when this
went in, if we don't restore this class, users will have to jump through hoops to make 1.7.0
work with those intermediate versions of Hive (0.14.0, 1.2.0)

At this point, it's much easier to make an empty class in Accumulo that will allow Hive to
continue operating as-is. After enough time/releases, we can remove it again from Accumulo.



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