Optimize M-R by bulk excluding regions - less InputSplit-s to avoid traffic on
region servers when performing M-R on a subset of the schema
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Key: HBASE-2302
URL: https://issues.apache.org/jira/browse/HBASE-2302
Project: Hadoop HBase
Issue Type: Improvement
Reporter: Kay Kay
TableInputFormatBase , creates a InputSplit per region. Given that the keys
are sorted - sometimes - it might be needed to perform M-R on a subset of the
keyset ( regions ) . Adding a provision to filter the regions when generating
InputSplits might be useful .
The granularity of exclusion is per-region-wise. A RowFilter might still be
needed during a Scan on a separate region, but that is a separate issue
altogether.
Methodology: Add a way to prune the keyset before generating inputsplits , by
default - all sets are returned indicating all regions are included that could
be overridden as necessary, depending on the higher-level logic.
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