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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