Eugene Koifman created HIVE-4679:
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Summary: WebHCat can deadlock Hadoop if the number of concurrently
running tasks if higher or equal than the number of mappers
Key: HIVE-4679
URL: https://issues.apache.org/jira/browse/HIVE-4679
Project: Hive
Issue Type: Bug
Components: HCatalog
Affects Versions: 0.10.0
Reporter: Eugene Koifman
o In the current Templeton design, each time a Job is submitted thru the REST
API (it can be Pig/Hive or MR job), it will consume one Hadoop map slot. Given
that the number of map slots is finite in the cluster (16 node cluster will
have 32 map slots), in some circumstances, a user can deadlock the cluster if
Templeton job submission pipeline takes over all map slots (Templeton map tasks
will wait for the actual underlying jobs to complete, what will never happen,
given that Hadoop has no free map slots to schedule new tasks).
o HCat queries use a different mechanism and do not contribute to the deadlock.
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