hadoop-common-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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?

Thanks,
Manhee Jo 



Mime
View raw message