[jira] [Created] (CASSANDRA-10981) Consider striping view locks by key and cfid

["Tyler Hobbs (JIRA)" <ji...@apache.org>]

Tyler Hobbs created CASSANDRA-10981:
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             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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