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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5862) Switch to adler checksum for sstables
Date Thu, 08 Aug 2013 20:44:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13733953#comment-13733953
] 

T Jake Luciani commented on CASSANDRA-5862:
-------------------------------------------

with current crc32
{code}
verages from the middle 80% of values:
interval_op_rate          : 14556
interval_key_rate         : 14556
latency median            : 2.7
latency 95th percentile   : 4.7
latency 99.9th percentile : 37.0
Total operation time      : 00:01:15
END
{code}

with adler32
{code}
Averages from the middle 80% of values:
interval_op_rate          : 17985
interval_key_rate         : 17985
latency median            : 2.0
latency 95th percentile   : 3.9
latency 99.9th percentile : 73.7
Total operation time      : 00:01:02
END
{code}
                
> Switch to adler checksum for sstables
> -------------------------------------
>
>                 Key: CASSANDRA-5862
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5862
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: T Jake Luciani
>             Fix For: 2.0.1
>
>         Attachments: 5862.txt
>
>
> Adler is significantly faster than CRC32: http://java-performance.info/java-crc32-and-adler32/
> (Adler is weaker for short inputs, so we should leave the commitlog alone, as it checksums
each mutation individually.)

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