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(Updated 2011-06-16 12:24:09.519284) Review request for hadoop-mapreduce. Changes ------- IOException catching ('stead of null). Summary ------- As discussed on HADOOP-7328, MapReduce can handle serializers in a much better way in case of bad configuration, improper imports (Some odd Text class instead of the Writable Text set as key), etc.. This issue covers the MapReduce parts of the improvements (made to MapOutputBuffer and possible early-check of serializer availability pre-submit) that provide more information than just an NPE as is the current case. This addresses bug MAPREDUCE-2584. http://issues.apache.org/jira/browse/MAPREDUCE-2584 Diffs (updated) ----- src/java/org/apache/hadoop/mapreduce/JobSubmitter.java 751d528 src/test/mapred/org/apache/hadoop/mapreduce/TestMRJobClient.java 5fa329a Diff: https://reviews.apache.org/r/885/diff Testing ------- Added a test case that expects a failure if no io.serializers are present. Thanks, Harsh