David Semeria created CASSANDRA-7535:
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Summary: Coverage analysis for range queries
Key: CASSANDRA-7535
URL: https://issues.apache.org/jira/browse/CASSANDRA-7535
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: David Semeria
Fix For: 2.0.9
This is a regression related to
https://issues.apache.org/jira/browse/CASSANDRA-4858
Range queries are taking orders of magnitude more time to complete than before
because the query planner is frequently unable to calculate the correct
intersection of contiguous ranges for a given node.
For example, SELECT * FROM TBL should result in exactly one scan at CL.ONE when
RF = #nodes when in fact it can result in several hundred scans (sometimes
thousands). The problem is exasperated with vnodes.
The regression occurred at some point between 2.0.4 (which works fine) and
2.0.9.
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