[jboss-jira] [JBoss JIRA] (JGRP-1876) MERGE3 : Strange number and content of subgroups

[Karim AMMOUS (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033330#comment-13033330 ] 

Karim AMMOUS commented on JGRP-1876:
------------------------------------

Hi Bela and Radim,

I reproduced the issue encountered by Radim, which is different form the current one.
Please find enclosed a test program. Just launch three instances and wait few minutes. Each merge, the number of subgroups increments by two.

In fact, old subgroups are not deleted. Adding clear instruction (subviews.clear()) at the begin of Merger.MergeTask.start() method fixes the problem.

Otherwise, my issue (JGRP-1876) still exists in spite of the patch. I think that I got the root cause, but it is not easy to reproduce it with a standalone program.

> MERGE3 : Strange number and content of subgroups
> ------------------------------------------------
>
>                 Key: JGRP-1876
>                 URL: https://issues.jboss.org/browse/JGRP-1876
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.4.2
>            Reporter: Karim AMMOUS
>            Assignee: Bela Ban
>             Fix For: 3.5.1, 3.6, 3.6.2
>
>         Attachments: 4Subgroups.zip, DkeJgrpAddress.java, MergeTest4.java, MergeViewWith210Subgroups.log, SplitMergeTest.java, views.txt
>
>
> Using JGroups 3.4.2, a split occurred and a merge was processed successfully but number of subgroups is wrong (210 instead of 2).
> The final mergeView is correct and contains 210 members.
> Here is an extract of subviews: 
> {code}
> INFO | Incoming-18,cluster,term-ETJ101697729-31726:host:192.168.56.6:1:CL(GROUP01)[F] | [MyMembershipListener.java:126] | (middleware) | MergeView view ID = [serv-ZM2BU35940-58033:vt-14:192.168.55.55:1:CL(GROUP01)[F]|172]
> 210 subgroups 
> [....
> [term-ETJ100691812-36873:host:192.168.56.16:1:CL(GROUP01)[F]|170] (1) [term-ETJ104215245-11092:host:192.168.56.72:1:CL(GROUP01)[F]]
> [term-ETJ100691812-36873:host:192.168.56.16:1:CL(GROUP01)[F]|170] (1) [serv-ZM2BU38960-6907:asb:192.168.55.52:1:CL(GROUP01)[F]]
> [term-ETJ101697729-31726:host:192.168.56.6:1:CL(GROUP01)[F]|171] (1) [term-ETJ101697729-31726:host:192.168.56.6:1:CL(GROUP01)[F]]
> [term-ETJ100691812-36873:host:192.168.56.16:1:CL(GROUP01)[F]|170] (1) [serv-ZM2BU47533-55240:vt-14:192.168.55.57:1:CL(GROUP01)[F]]
> [term-ETJ100691812-36873:host:192.168.56.16:1:CL(GROUP01)[F]|170] (1) [serv-ZM2BU35943-49435:asb:192.168.55.51:1:CL(GROUP01)[F]]
> ....]
> {code}
> II wasn't able to reproduce that with a simple program. But I observed that merge was preceded by an ifdown/ifup on host 192.168.56.6. That member lost all others members, but it still present in their view.
> Example:  
> {code}
> {A, B, C} => {A, B, C} and {C} => {A, B, C}
> {code}



--
This message was sent by Atlassian JIRA
(v6.3.11#6341)