Improve gets/scans when all columns of a key is requested.
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Key: HBASE-2362
URL: https://issues.apache.org/jira/browse/HBASE-2362
Project: Hadoop HBase
Issue Type: Improvement
Components: regionserver
Reporter: Karthik Ranganathan
Right now, we get one KeyValue at a time and run it through the matcher even if
the query is to fetch the entire row (or even an entire column family for a
key). This causes the blocks to be fetched serially from HDFS. We can optimize
this by looking at the block map, and fetching all the blocks spanned by the
key in one request to HDFS.
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