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From "Benjamin Coverston (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-10467) QoS for Queries
Date Wed, 07 Oct 2015 20:36:26 GMT
Benjamin Coverston created CASSANDRA-10467:
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             Summary: QoS for Queries
                 Key: CASSANDRA-10467
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10467
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Benjamin Coverston


Background: As an OLTP system that is based on pipelined execution worker pools can be saturated
with long(er) running calls. When the system is under stress, those long running calls can
make requests that should be short lived requests take a much longer period of time.

Introduce the concept of QoS into Cassandra for client queries. A few ideas:

1. Allow clients to specify a QoS to be sent to Cassandra from the driver as part of the protocol.

2. Allow different requests to be tagged based on some simple criteria (perhaps configured)
(i.e. ALLOW FILTERING was part of the query)

3. QOS based on the LUN that is accessed (SSDs get higher QOS than the RAID5)





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