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Posted to dev@activemq.apache.org by "Scott England-Sullivan (Created) (JIRA)" <ji...@apache.org> on 2012/02/08 17:23:06 UTC
[jira] [Created] (AMQ-3706) Dynamic Failover Randomize is Not
Evenly Balanced
Dynamic Failover Randomize is Not Evenly Balanced
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Key: AMQ-3706
URL: https://issues.apache.org/jira/browse/AMQ-3706
Project: ActiveMQ
Issue Type: Sub-task
Components: Broker
Affects Versions: 5.5.0
Reporter: Scott England-Sullivan
Fix For: 5.6.0
When using dynamic failover with randomize enabled, clients are not consistently rebalanced in an even manner. A test case is added that allows a minimum of 25% per broker on a three broker test and 40% distribution on a 2 broker test.
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[jira] [Resolved] (AMQ-3706) Dynamic Failover Randomize is Not
Evenly Balanced
Posted by "Dejan Bosanac (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/AMQ-3706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dejan Bosanac resolved AMQ-3706.
--------------------------------
Resolution: Fixed
Assignee: Dejan Bosanac
Fixed with svn revision 1242748
The problem was that every client was responsible for randomizing his list of urls, and as every client uses it's own rnd generator we haven't had a uniform distribution.
if the cluster rebalance is used, now we're doing a randomization on the broker side (always using same rnd generator) and clients now respect the url order broker supplied. It give much better distribution in this case.
> Dynamic Failover Randomize is Not Evenly Balanced
> -------------------------------------------------
>
> Key: AMQ-3706
> URL: https://issues.apache.org/jira/browse/AMQ-3706
> Project: ActiveMQ
> Issue Type: Sub-task
> Components: Broker
> Affects Versions: 5.5.0
> Reporter: Scott England-Sullivan
> Assignee: Dejan Bosanac
> Fix For: 5.6.0
>
> Attachments: AMQ-3706.patch
>
>
> When using dynamic failover with randomize enabled, clients are not consistently rebalanced in an even manner. A test case is added that allows a minimum of 25% per broker on a three broker test and 40% distribution on a 2 broker test.
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[jira] [Updated] (AMQ-3706) Dynamic Failover Randomize is Not
Evenly Balanced
Posted by "Scott England-Sullivan (Updated) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/AMQ-3706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Scott England-Sullivan updated AMQ-3706:
----------------------------------------
Attachment: AMQ-3706.patch
Updated cluster test cases
> Dynamic Failover Randomize is Not Evenly Balanced
> -------------------------------------------------
>
> Key: AMQ-3706
> URL: https://issues.apache.org/jira/browse/AMQ-3706
> Project: ActiveMQ
> Issue Type: Sub-task
> Components: Broker
> Affects Versions: 5.5.0
> Reporter: Scott England-Sullivan
> Fix For: 5.6.0
>
> Attachments: AMQ-3706.patch
>
>
> When using dynamic failover with randomize enabled, clients are not consistently rebalanced in an even manner. A test case is added that allows a minimum of 25% per broker on a three broker test and 40% distribution on a 2 broker test.
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[jira] [Commented] (AMQ-3706) Dynamic Failover Randomize is Not
Evenly Balanced
Posted by "Dejan Bosanac (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/AMQ-3706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249842#comment-13249842 ]
Dejan Bosanac commented on AMQ-3706:
------------------------------------
svn revision 1311237 implements round-robin distribution of urls to clients instead of rnd. It should give a better distribution of clients over the cluster especially in small number of clients case.
> Dynamic Failover Randomize is Not Evenly Balanced
> -------------------------------------------------
>
> Key: AMQ-3706
> URL: https://issues.apache.org/jira/browse/AMQ-3706
> Project: ActiveMQ
> Issue Type: Sub-task
> Components: Broker
> Affects Versions: 5.5.0
> Reporter: Scott England-Sullivan
> Assignee: Dejan Bosanac
> Fix For: 5.6.0
>
> Attachments: AMQ-3706.patch
>
>
> When using dynamic failover with randomize enabled, clients are not consistently rebalanced in an even manner. A test case is added that allows a minimum of 25% per broker on a three broker test and 40% distribution on a 2 broker test.
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