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Posted to commits@cassandra.apache.org by "Yuki Morishita (JIRA)" <ji...@apache.org> on 2012/12/19 19:17:13 UTC
[jira] [Updated] (CASSANDRA-5076)
Murmur3Partitioner#describeOwnership calculates ownership% wrong
[ https://issues.apache.org/jira/browse/CASSANDRA-5076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yuki Morishita updated CASSANDRA-5076:
--------------------------------------
Attachment: 5076.txt
Patch attached to calculate ownership using BigInteger/BigDecimal for range (Long.MIN_VALUE, Long.MAX_VALUE].
This will also resolve problem described in CASSANDRA-4598.
> Murmur3Partitioner#describeOwnership calculates ownership% wrong
> ----------------------------------------------------------------
>
> Key: CASSANDRA-5076
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5076
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 1.2.0 rc1
> Reporter: Yuki Morishita
> Priority: Minor
> Attachments: 5076.txt
>
>
> When I issued 'nodetool status' on Murmur3-partitioned cluster I got the following output:
> {code}
> $ bin/nodetool -p 7100 status (git)-[5065]-[~/Developments/workspace/cassandra]
> Datacenter: datacenter1
> =======================
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> -- Address Load Owns Host ID Token Rack
> UN 127.0.0.1 24.78 KB 66.7% ace7e54c-9fe1-4b23-83b0-949772b24c30 -9223372036854775808 rack1
> UN 127.0.0.2 29.22 KB 66.7% 67146442-dbfd-449c-82e1-26729b8ac89c -3074457345618258603 rack1
> UN 127.0.0.3 6.19 KB 66.7% 3fab9f18-daf3-4452-8b9c-204ea0ee2e15 3074457345618258602 rack1
> {code}
> Notice that 'Owns' percentages add up to 200%.
> I think the problem is that Murmur3Partitioner#describeOwnership currently calculate ownership% based on [0, Long.MAX_VALUE] range, but we have to consider about negative tokens.
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