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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2015/05/25 09:13:17 UTC

[jira] [Created] (CASSANDRA-9469) Improve Load Shedding

Benedict created CASSANDRA-9469:
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             Summary: Improve Load Shedding
                 Key: CASSANDRA-9469
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9469
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Benedict
             Fix For: 3.x


As discussed in CASSANDRA-9318, load shedding currently provides very few guarantees and is not employed at every stage of the pipeline. It is relatively simple to impose bounds on the number of items in a pipeline stage, along with the age of the items (as we currently impose). We should also ensure that the predicates are imposed on addition to a pipeline stage, not removal (as in the mutation/read stage case), since this does not prevent dangerous build up of outstanding tasks when outlier (or buggy) tasks arrive together (and block processing).



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