Vijay created CASSANDRA-4705:
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Summary: Speculative execution for CL_ONE
Key: CASSANDRA-4705
URL: https://issues.apache.org/jira/browse/CASSANDRA-4705
Project: Cassandra
Issue Type: Bug
Affects Versions: 1.2.0
Reporter: Vijay
Assignee: Vijay
Priority: Minor
When read_repair is not 1.0, we send the request to one node for some of the
requests. When a node goes down or when a node is too busy the client has to
wait for the timeout before it can retry.
It would be nice to watch for latency and execute an additional request to a
different node, if the response is not received within average/99% of the
response times recorded in the past.
CASSANDRA-2540 might be able to solve the variance when read_repair is set to
1.0
1) May be we need to use metrics-core to record various Percentiles
2) Modify ReadCallback.get to execute additional request speculatively.
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