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From "Tyler Hobbs (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-10981) Consider striping view locks by key and cfid
Date Thu, 07 Jan 2016 19:41:39 GMT
Tyler Hobbs created CASSANDRA-10981:
---------------------------------------

             Summary: Consider striping view locks by key and cfid
                 Key: CASSANDRA-10981
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10981
             Project: Cassandra
          Issue Type: Improvement
          Components: Coordination
            Reporter: Tyler Hobbs
            Assignee: Tyler Hobbs


We use a striped lock to protect updates to tables with materialized views, and the lock is
currently striped by the partition key of the {{Mutation}}.  This causes concurrent updates
to separate tables with the same partition key to contend for the same lock, resulting in
one or more of the mutations being rescheduled on the {{MUTATION}} threadpool (potentially
becoming an asynchronous operation instead a synchronous operations, from the perspective
of local internal modifications).

Since it's probably fairly common to use the same partition key across multiple tables, I
suggest that we add the cfid of the affected table to the lock striping, and acquire one lock
per affected table (with the same rescheduling-under-contention behavior).



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