rajeshbabu created HBASE-9556:
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Summary: Provide key range support to bulkload to avoid too many
reducers even the data belongs to few regions
Key: HBASE-9556
URL: https://issues.apache.org/jira/browse/HBASE-9556
Project: HBase
Issue Type: Improvement
Components: mapreduce
Reporter: rajeshbabu
Assignee: rajeshbabu
Priority: Minor
Presently the number of reducers in bulk load are equal to number of regions.
Lets suppose a table has 500 regions and import data only belongs 10 regions,
still we are starting 500(equal to no. of regions) reducers instead of 10.
Which will consume more time and resources.
If user knows the row key range of import data, then we can pass startkey
and/or endkey as input and based on the key range we can define the partitions
and number of reducers(regions to which the data belongs). This helps to avoid
too many reducers to start and do nothing and also avoids contention in
shuffling.
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