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From "Greg Wittel (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6945) Inclusion of Old Jackson-JSON Breaks tasks using Avro (or any task depending on Jackson JSON)
Date Wed, 08 Sep 2010 15:41:32 GMT
Inclusion of Old Jackson-JSON Breaks tasks using Avro (or any task depending on Jackson JSON)
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                 Key: HADOOP-6945
                 URL: https://issues.apache.org/jira/browse/HADOOP-6945
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.21.0
            Reporter: Greg Wittel


HADOOP-6184 added the ability to serialize the Configuration to JSON.  However its inclusion
of jackson-1.0.1 means that any map-reduce task that depends (directly or indirectly) on Jackson,
can only use Jackson 1.0.1 APIs.  The 100% fix is to give the task's classpath priority over
the core/common classpath (MAPREDUCE-1700/MAPREDUCE-1938) so that a job can use newer revisions
of the library.

For a nearer term fix, is it possible to upgrade the included Jackson library to a recent
version (1.5.x+)?  The APIs are backwards compatible.  alernatively, its possible to eliminate
the use of Jackson for this minor feature as the Configuration object could be serialized
to JSON without a 3rd party library.

An ancilliary issue is that the jackson.version referenced in ivy.xml is never specified in
the source tree (ivy/libraries.properties).

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