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Review request for hive. Summary ------- In dynamic partition inserts, if a mapper created too many partitions, a fatal error is raised and the job got killed. Sometimes the error is caused by data error and it will be helpful for users to debug if we display a sample of dynamic partitions generated. This addresses bug HIVE-2252. https://issues.apache.org/jira/browse/HIVE-2252 Diffs ----- trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/FileSinkOperator.java 1141747 Diff: https://reviews.apache.org/r/1013/diff Testing ------- passed all unit tests. Thanks, Ning