[CASSANDRA-5076] Murmur3Partitioner#describeOwnership calculates ownership% wrong

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.2.0 rc2
• Severity: Low
• Assignee: Yuki Morishita
• Reporter: Yuki Morishita

Authors

Yuki Morishita

Reviewers

Sylvain Lebresne

• Created: 18/Dec/12 20:37
• Updated: 16/Apr/19 09:32
• Resolved: 19/Dec/12 18:44

Description

When I issued 'nodetool status' on Murmur3-partitioned cluster I got the following output:

$ 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

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.

Issue Links

• is related to: CASSANDRA-4598 describeOwnership() in Murmur3Partitioner.java doesn't work for close tokens