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From "Vishy Kasar (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-9205) Allow per statement time outs or request cancel method
Date Thu, 16 Apr 2015 17:40:58 GMT
Vishy Kasar created CASSANDRA-9205:

             Summary: Allow per statement time outs or request cancel method
                 Key: CASSANDRA-9205
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Vishy Kasar

Cassandra lets user specify time outs for various operations globally in yaml. It would be
great if we could set different timeouts for CQL statements in different contexts, rather
than just having a global  timeouts in yaml. We have client requests that need to time out
in a short duration vs some maintenance requests that we know take long. The only choice we
have now is to set the server time out to the highest needed. 

User can certainly do session.executeAsync on the client side and wait for certain time on
the returned future. However when user cancels the future on time out, nothing is done on
the server side. We have seen cases where cassandra replicas were going over thousands of
tombstones and causing OOMs way after client timed out. 

This can be implemented either by passing the time out along with query to server or by providing
a cancel method similar to

It is understood that server may not be able to timeout/cancel the requests in all cases.
So this is a request to server to do it's best effort to timeout/cancel.

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