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https://issues.apache.org/jira/browse/CASSANDRA-13348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15931215#comment-15931215
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Tom van der Woerdt edited comment on CASSANDRA-13348 at 3/18/17 1:45 PM:
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It seems that /at least/ four nodes were affected by this, all in the same DC.
I'm decommissioning and rejoining them all, in an attempt to get the cluster
healthy again.
[update] after decommissioning the node that looked most affected by this, the
other nodes show 256 tokens again. Restarted them to be sure.
To me this suggests the token allocation code is too good and tries to allocate
tokens that best ensures balance across the cluster. But for a cluster that's
already in perfect balance, it will choose tokens that already exist?
This message seems relevant :
{noformat}Unexpected growth in standard deviation after allocation.{noformat}
was (Author: tvdw):
It seems that /at least/ four nodes were affected by this, all in the same DC.
I'm decommissioning and rejoining them all, in an attempt to get the cluster
healthy again.
[update] after decommissioning the node that looked most affected by this, the
other nodes show 256 tokens again. Restarted them to be sure.
To me this suggests the token allocation code is too good and tries to allocate
tokens that best ensures balance across the cluster. But for a cluster that's
already in perfect balance, it will choose tokens that already exist?
> Duplicate tokens after bootstrap
> --------------------------------
>
> Key: CASSANDRA-13348
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13348
> Project: Cassandra
> Issue Type: Bug
> Reporter: Tom van der Woerdt
> Priority: Critical
>
> This one is a bit scary, and probably results in data loss. After a bootstrap
> of a few new nodes into an existing cluster, two new nodes have chosen some
> overlapping tokens.
> In fact, of the 256 tokens chosen, 51 tokens were already in use on the other
> node.
> Node 1 log :
> {noformat}
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,461
> StorageService.java:1160 - JOINING: waiting for ring information
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,461
> StorageService.java:1160 - JOINING: waiting for schema information to complete
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,461
> StorageService.java:1160 - JOINING: schema complete, ready to bootstrap
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,462
> StorageService.java:1160 - JOINING: waiting for pending range calculation
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,462
> StorageService.java:1160 - JOINING: calculation complete, ready to bootstrap
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,462
> StorageService.java:1160 - JOINING: getting bootstrap token
> WARN [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,564
> TokenAllocation.java:61 - Selected tokens [............, 2959334889475814712,
> 3727103702384420083, 7183119311535804926, 6013900799616279548,
> -1222135324851761575, 1645259890258332163, -1213352346686661387,
> 7604192574911909354]
> WARN [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,729
> TokenAllocation.java:65 - Replicated node load in datacentre before
> allocation max 1.00 min 1.00 stddev 0.0000
> WARN [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,729
> TokenAllocation.java:66 - Replicated node load in datacentre after allocation
> max 1.00 min 1.00 stddev 0.0000
> WARN [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:43,729
> TokenAllocation.java:70 - Unexpected growth in standard deviation after
> allocation.
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:42:44,150
> StorageService.java:1160 - JOINING: sleeping 30000 ms for pending range setup
> INFO [RMI TCP Connection(107)-127.0.0.1] 2017-03-09 07:43:14,151
> StorageService.java:1160 - JOINING: Starting to bootstrap...
> {noformat}
> Node 2 log:
> {noformat}
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:51,937
> StorageService.java:971 - Joining ring by operator request
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,513
> StorageService.java:1160 - JOINING: waiting for ring information
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,513
> StorageService.java:1160 - JOINING: waiting for schema information to complete
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,513
> StorageService.java:1160 - JOINING: schema complete, ready to bootstrap
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,513
> StorageService.java:1160 - JOINING: waiting for pending range calculation
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,514
> StorageService.java:1160 - JOINING: calculation complete, ready to bootstrap
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,514
> StorageService.java:1160 - JOINING: getting bootstrap token
> WARN [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,630
> TokenAllocation.java:61 - Selected tokens [......, 2890709530010722764,
> -2416006722819773829, -5820248611267569511, -5990139574852472056,
> 1645259890258332163, 9135021011763659240, -5451286144622276797,
> 7604192574911909354]
> WARN [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,794
> TokenAllocation.java:65 - Replicated node load in datacentre before
> allocation max 1.02 min 0.98 stddev 0.0000
> WARN [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:52,795
> TokenAllocation.java:66 - Replicated node load in datacentre after allocation
> max 1.00 min 1.00 stddev 0.0000
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:55:53,149
> StorageService.java:1160 - JOINING: sleeping 30000 ms for pending range setup
> INFO [RMI TCP Connection(380)-127.0.0.1] 2017-03-17 15:56:23,149
> StorageService.java:1160 - JOINING: Starting to bootstrap...
> {noformat}
> eg. 7604192574911909354 has been chosen by both.
> The joins were eight days apart, so I don't think it's a race :)
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