Amit Singh Chowdhery created CASSANDRA-8938:
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Summary: Full Row Scan does not count towards Reads
Key: CASSANDRA-8938
URL: https://issues.apache.org/jira/browse/CASSANDRA-8938
Project: Cassandra
Issue Type: Bug
Components: API, Core, Tools
Environment: Unix, Cassandra 2.0.3
Reporter: Amit Singh Chowdhery
Priority: Minor
When a CQL SELECT statement is executed with WHERE clause, Read Count is
incremented in cfstats of the column family. But, when a full row scan is done
using SELECT statement without WHERE clause, Read Count is not incremented.
Similarly, when using Size Tiered Compaction, if we do a full row scan using
Hector RangeslicesQuery, Read Count is not incremented in cfstats, Cassandra
still considers all sstables as cold and does not trigger compaction for them.
If we fire MultigetSliceQuery, Read Count is incremented and sstables becomes
hot, triggering compaction of these sstables.
Expected Behavior:
1. Read Count must be incremented by number of rows read during a full row scan
done using CQL SELECT statement or Hector RangeslicesQuery.
2. Size Tiered compaction must consider all sstables as Hot after a full row
scan.
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