FAQ > How to Determine whether the DMExpress Hadoop Sort Fell Back to the Native Hadoop Sort

How to Determine whether the DMExpress Hadoop Sort Fell Back to the Native Hadoop Sort

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Summary

When a MapReduce job uses functionality that is not supported by the DMExpress Hadoop Sort plugin, DMExpress will be unable to accelerate the sort performance, and the job will fall back to the native Hadoop sort. This happens seamlessly and does not affect the successful running of the job.

You can confirm that fallback has occurred by checking the Hadoop job logs.

Resolution

To confirm whether fallback has occurred, check the Hadoop logs for the MapReduce job.

Additional Information

For information on finding the Hadoop job logs, see Finding DMExpress Hadoop Logs on MRv1 or Finding DMExpress Hadoop Logs on YARN (MRv2).

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