parallelize fetching rows for low-cardinality indexes
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Key: CASSANDRA-1337
URL: https://issues.apache.org/jira/browse/CASSANDRA-1337
Project: Cassandra
Issue Type: Improvement
Reporter: Jonathan Ellis
Priority: Minor
Fix For: 0.7.0
currently, we read the indexed rows from the first node (in partitioner order);
if that does not have enough matching rows, we read the rows from the next, and
so forth.
we should use the statistics fom CASSANDRA-1155 to query multiple nodes in
parallel, such that we have a high chance of getting enough rows w/o having to
do another query (but, if our estimate is incorrect, we do need to loop and do
a 2nd query).
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