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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-3772) Evaluate Murmur3-based partitioner
Date Thu, 23 Aug 2012 15:04:42 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pavel Yaskevich updated CASSANDRA-3772:
---------------------------------------

    Attachment: CASSANDRA-3772-v4.patch

v4 includes the following changes:

  - LongToken is added to o.a.c.dht
  - M3P is changed to use LongToken
  - AbstractHashedPartitioner is removed as no longer needed
  - RP was reverted to it's previous code state (before split into AHP and M3P)
  - NEWS.txt are updated to reflect change in default partitioner
  - added Murmur3PartitionerTest

change to use longs in M3P buys us another ~6-7 op/s comparing to BigIntegerToken.
                
> Evaluate Murmur3-based partitioner
> ----------------------------------
>
>                 Key: CASSANDRA-3772
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3772
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>             Fix For: 1.2.0
>
>         Attachments: 0001-CASSANDRA-3772.patch, 0001-CASSANDRA-3772-Test.patch, CASSANDRA-3772-v2.patch,
CASSANDRA-3772-v3.patch, CASSANDRA-3772-v4.patch, hashed_partitioner_3.diff, hashed_partitioner.diff,
MumPartitionerTest.docx, try_murmur3_2.diff, try_murmur3.diff
>
>
> MD5 is a relatively heavyweight hash to use when we don't need cryptographic qualities,
just a good output distribution.  Let's see how much overhead we can save by using Murmur3
instead.

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