[ https://issues.apache.org/jira/browse/HADOOP-6945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer resolved HADOOP-6945.

Resolution: Fixed
Inclusion of Old Jackson-JSON Breaks tasks using Avro (or any task depending on Jackson JSON)

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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