Hi, 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. Regards Noam Information in this e-mail and its attachments is confidential and privileged under the TEOCO confidentiality terms that can be reviewed here<http://www.teoco.com/email-disclaimer>.
