[jboss-jira] [JBoss JIRA] (JGRP-1915) JDBC_PING discovery fails when stale entries are found in the database

[Patrick Haas (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045040#comment-13045040 ] 

Patrick Haas commented on JGRP-1915:
------------------------------------

A note on the sorting/shuffling:

The coordinators are shuffled, but if there are no coordinators, the remaining members are sorted:
https://github.com/belaban/JGroups/blob/master/src/org/jgroups/protocols/pbcast/ClientGmsImpl.java#L167

I'll take a look at your other feedback now. Thanks :)

> JDBC_PING discovery fails when stale entries are found in the database
> ----------------------------------------------------------------------
>
>                 Key: JGRP-1915
>                 URL: https://issues.jboss.org/browse/JGRP-1915
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.6.1
>            Reporter: Patrick Haas
>            Assignee: Bela Ban
>             Fix For: 3.6.3
>
>
> Node: "CHQ-PATRICKH-55008"
> Database contains two rows.. other node is dead but was unable to remove the JDBC entry.
> 1) JChannel.connect(...)
> 2) JChannel.down(Event[CONNECT_WITH_STATE_TRANSFER_USE_FLUSH])
> 3) STATE_TRANSFER -> FRAG2 -> MFC -> UFC -> GMS
> 4) GMS.down(...) calls out to joinWithStateTransfer -> joinInternal(...)
> JDBC pulls the node list from the database table.
> Ping Data:
>  - CHQ-PATRICKH-3895, name=CHQ-PATRICKH-3895, addr=10.1.130.228:55503, server
>  - CHQ-PATRICKH-55008, name=CHQ-PATRICKH-55008, addr=10.1.130.228:57489
> joinInternal is a never-terminating while loop:
>  - down: Event.FIND_INITIAL_MBRS_EVT
>  - inspect responses -- no valid join responses
>  - responses are NOT empty -> does not become singletonMember
>  - gets all coordinators (none)
>  - Sorts all nodes by GUID in a TreeSet
>  - Is first of all joiners?
>   - No, another joiner is listed first
> ... repeat forever
> When the process is restarted and a node ID < than the existing db entry is generated, it successfully takes over as owner.



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