skip records that throw exceptions
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Key: HADOOP-153
URL: http://issues.apache.org/jira/browse/HADOOP-153
Project: Hadoop
Type: New Feature
Components: mapred
Reporter: Doug Cutting
MapReduce should skip records that throw exceptions.
If the exception is thrown under RecordReader.next() then RecordReader
implementations should automatically skip to the start of a subsequent record.
Exceptions in map and reduce implementations can simply be logged, unless they
happen under RecordWriter.write(). Cancelling partial output could be hard.
So such output errors will still result in task failure.
This behaviour should be optional, but enabled by default. A count of errors
per task and job should be maintained and displayed in the web ui. Perhaps if
some percentage of records (>50%?) result in exceptions then the task should
fail. This would stop jobs early that are misconfigured or have buggy code.
Thoughts?
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