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From "Aleksey Yeschenko (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-8938) Full Row Scan does not count towards Reads
Date Thu, 12 Nov 2015 16:27:11 GMT


Aleksey Yeschenko updated CASSANDRA-8938:
    Issue Type: Improvement  (was: Bug)

> Full Row Scan does not count towards Reads
> ------------------------------------------
>                 Key: CASSANDRA-8938
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local Write-Read Paths
>         Environment: Unix, Cassandra 2.0.3
>            Reporter: Amit Singh Chowdhery
>            Priority: Minor
>              Labels: none
>             Fix For: 3.x
> 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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