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From "Bulvik, Noam" <>
Subject high CPU when using bulk loading
Date Wed, 07 Jan 2015 12:55:38 GMT


We  are tuning our system for bulk loading. We managed to load ~250M records per hour (~96G
of raw input csv data ) on a cluster with 8 nodes. We use MR bulk loading tool with pre split
table and salted key.

What we currently see is that while Mappers are working we have 100% CPU usage across the
cluster. It was our impression that the mapper will be I/O bound and not so much CPU intensive

Any idea what else can we tune /check.



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