Jean-Marc Spaggiari created HBASE-11562:
-------------------------------------------
Summary: CopyTable should provide an option to shuffle the mapper
tasks
Key: HBASE-11562
URL: https://issues.apache.org/jira/browse/HBASE-11562
Project: HBase
Issue Type: Bug
Components: mapreduce
Affects Versions: 0.99.0
Reporter: Jean-Marc Spaggiari
Assignee: Jean-Marc Spaggiari
When doing a copy table from a table with a lot of regions to a table to way
less regions, on a cluster with limited number of mappers, since map tasks are
ordered by key, tasks will first run for the few first regions and will hotspot
a single region server on the destination side.
To avoid this, we should submit the map tasks in a random order.
This JIRA is to add this option to CopyTable and TableInputFormat
--
This message was sent by Atlassian JIRA
(v6.2#6252)
