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From "Jeremy Hanna (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-10981) Consider striping view locks by key and cfid
Date Thu, 22 Jun 2017 16:34:08 GMT


Jeremy Hanna updated CASSANDRA-10981:
    Component/s: Materialized Views

> Consider striping view locks by key and cfid
> --------------------------------------------
>                 Key: CASSANDRA-10981
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Coordination, Materialized Views
>            Reporter: Tyler Hobbs
>            Assignee: Tyler Hobbs
>            Priority: Minor
>             Fix For: 3.4
> 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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