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From "Brandon Williams (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7928) Digest queries do not require alder32 checks
Date Mon, 15 Sep 2014 20:49:33 GMT


Brandon Williams commented on CASSANDRA-7928:

I've heard that in profiling CPU usage for adler32 was ~23% while decompression was ~12%,
which doesn't make a lot of sense to me.  What do you think [~benedict]?

> Digest queries do not require alder32 checks
> --------------------------------------------
>                 Key: CASSANDRA-7928
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: sankalp kohli
>            Priority: Minor
>  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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