Map/Reduce parallelism with Master/Slave
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Justin Thomas
Jan 20, 2011, 11:27:23 AM1/20/11
to mongodb-user
If you have a simple setup for master/slave pre-sharding are the map/
reduce jobs parallelized to all the slaves? Or in the case you have a
replica set does it parallelized to all the machines in the replica
set or is it just by shard?
reduce jobs parallelized to all the slaves? Or in the case you have a
replica set does it parallelized to all the machines in the replica
set or is it just by shard?
Nat
Jan 20, 2011, 11:50:45 AM1/20/11
to mongod...@googlegroups.com
Previously it never runs in slaves. The behavior will change to be able to run on slave with http://jira.mongodb.org/browse/SERVER-2286 but I doubt it will use all slaves. I believe it should just pick a machine in each replica to do the job.
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