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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7928) Digest queries do not require alder32 checks
Date Thu, 18 Sep 2014 20:11:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14139423#comment-14139423
] 

Jeremiah Jordan commented on CASSANDRA-7928:
--------------------------------------------

In the mean time, you can lower the crc_check_chance to do it less often.

> Digest queries do not require alder32 checks
> --------------------------------------------
>
>                 Key: CASSANDRA-7928
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7928
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: sankalp kohli
>            Assignee: sankalp kohli
>            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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