KeyFieldBasedPartitioner should encode free and handle ArrayOutOfIndex
exception!
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Key: HADOOP-5779
URL: https://issues.apache.org/jira/browse/HADOOP-5779
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: ZhuGuanyin
Fix For: 0.20.1
1) Currently, KeyFieldBasedPartitioner only support utf8 encoded recored, we
should use text or byteswriteable data types.
2) when using KeyFieldBasedPartitioner, if the record doesn't contain the
specified field, the endChar would equal with array.length, which throw
ArrayOutOfIndex exception, losting that record!
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