[jboss-jira] [JBoss JIRA] (JGRP-1493) Merge fails because failing to get physical address takes too long

[David Hotham (JIRA)]

David Hotham created JGRP-1493:
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             Summary: Merge fails because failing to get physical address takes too long
                 Key: JGRP-1493
                 URL: https://issues.jboss.org/browse/JGRP-1493
             Project: JGroups
          Issue Type: Feature Request
    Affects Versions: 3.1
            Reporter: David Hotham
            Assignee: Bela Ban


Start with the following views:
-  A, B and C all have {A,B,C}
-  D has {B', D, A, C'}, where B' and C' are dead.

A decides to lead a merge (he's the only 'actual' coordinator).  By the time we've been through view-sanitization and so on and reached getMergeDataFromSubgroupCoordinators(), coords are {D, C', A}.

Here A tries to send MERGE_REQ to those elements.  However, A does not have a physical address for C', and in fact nor does anyone else.  So when trying to send the MERGE_REQ to C', A will always spend a little over 5 seconds in TP.sendToSingleMember() - trying and failing to discover that physical address.

Of course A won't get a response from C' either, so it will take another 5 seconds for merge_rsps.waitForAllResponses to time out.

But that means that it's a sure thing that the MergeKiller will kick in first.

Therefore the merge can never progress.  

(Presumably the situation would be even worse if there was more than one

I expect to work around this by tweaking the timings somewhere: probably in startMergeKiller, so that the MergeKiller takes longer to be scheduled.

I'd think that the right fix would be to arrange that the MergeTask is not blocked by TP having no physical address for a member.  

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