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From Manhee Jo ...@nttdocomo.com>
Subject mrmetrics.log collision on write
Date Fri, 30 Oct 2009 05:14:55 GMT
Hi all,

MR metrics log file ("/tmp/mrmetrics.log") is set by global configuration 
per datanode.
But there can be multiple mappers running on the datanode at the same time.
When multiple mappers write MR metrics to /tmp/mrmetrics.log,
how do they solve collition on write? Are there any arbitration mechanisms
to synchronize the write?

Manhee Jo 

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