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From "sankalp kohli (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7928) Digest queries do not require alder32 checks
Date Tue, 23 Sep 2014 17:46:37 GMT


sankalp kohli commented on CASSANDRA-7928:

[~tjake]  I agree it is hard to do but important. Even with better hash methods, there will
still be some CPU involved. This will cut that multiple times for higher RF and CL queries.

So closing it for CASSANDRA-7130 is not correct!!

> Digest queries do not require alder32 checks
> --------------------------------------------
>                 Key: CASSANDRA-7928
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: sankalp kohli
>            Assignee: T Jake Luciani
>            Priority: Minor
>              Labels: performance
>             Fix For: 2.1.1
>  While reading data from sstables, C* does Alder32 checks for any data being read. We
have seen that this causes higher CPU usage while doing kernel profiling. These checks might
not be useful for digest queries as they will have a different digest in case of corruption.


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