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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4498) Remove hsqldb jar from Hadoop runtime classpath
Date Tue, 31 Jul 2012 19:25:35 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Kanter updated MAPREDUCE-4498:
-------------------------------------

    Attachment: MAPREDUCE-4498-v2.patch

Alejandro and I tried to modify the example to use reflection to pick up the hsql jar from
the -libjars argument, but that just caused it to fail in the DBInputFormat because DriverManager
tries to instantiate the JDBC driver from the bootstrap classloader (-libjars is a different
classloader).  This approach also made the example's code unnecessarily complicated because
of all of the reflection.  

Instead, we left the example's code alone, but moved the hsqldb 2.x jar out of the mapred/lib/
dir of the TAR and into a new mapred/lib-examples/ dir.  Then to run the DBCountPageView example,
you would do:
{noformat}
$ export HADOOP_CLASSPATH=share/hadoop/mapreduce/lib-examples/hsqldb-2.0.0.jar
$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.0.0-SNAPSHOT.jar dbcount
-libjars share/hadoop/mapreduce/lib-examples/hsqldb-2.0.0.jar
{noformat}
                
> Remove hsqldb jar from Hadoop runtime classpath
> -----------------------------------------------
>
>                 Key: MAPREDUCE-4498
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4498
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: build, examples
>    Affects Versions: 2.2.0-alpha
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>            Priority: Critical
>             Fix For: 2.2.0-alpha
>
>         Attachments: MAPREDUCE-4498-v2.patch, MAPREDUCE-4498.patch
>
>
> The hsqldb jar is included in hadoop for the DBCountPageView example only.  Currently
the example is using hsqldb version 2.x; however, 2.x is incompatible with 1.8.x -- having
this jar in the hadoop class path conflicts with dependent projects like Oozie, Hive, and
Pig which still use 1.8.x.  As there are no features hsqldb 2.x that are used by the example,
we should remove it from Hadoop's runtime classpath.

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