Tasks are not evenly spread throughout cluster in MR2
-----------------------------------------------------
Key: MAPREDUCE-3951
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3951
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: scheduler
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
In MR1 (at least with the fair and fifo schedulers), if you submit a job that
needs fewer resources than the cluster can provide, the tasks are spread
relatively evenly across the node. For example, submitting a 100-map job to a
50-node cluster, each with 10 slots, results in 2 tasks on each machine. In
MR2, however, the tasks would pile up on the first 10 nodes of the cluster,
leaving the other nodes unused. This is highly suboptimal for many use cases.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
