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https://jira.jboss.org/jira/browse/JGRP-1027?page=com.atlassian.jira.plug...
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Bela Ban commented on JGRP-1027:
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I argue that this cannot happen: in ClientGmsImpl, a JoinRsp with a digest excluding the
joiner wil throw an exception. This means, a digest always contains an entry for
local_addr. And a send() won't be permitted until after the JOIN returned.
Are you running JOIN and SEND in parallel, on separate threads ?
So if A sends a message, xmit_table.get(A) must always return a non-null window !
Have you seen this not being the case ? If so, can this be reproduced ?
Setting the seqno to INITIAL_SEQNO might have big implications and could lead to subtle
errors. I poured many hours into getting the digests and seqnos right and would like to
avoid touching this part of the code.
Again, if there's a null window for a sender, then that's a bug and we need to
look into what's causing this and fix the bug, rather than create a new window in
ad-hoc fashion !
Race conditions can have NAKACK try to send to hosts don't have a
receiver window yet
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Key: JGRP-1027
URL:
https://jira.jboss.org/jira/browse/JGRP-1027
Project: JGroups
Issue Type: Bug
Affects Versions: 2.6.12
Reporter: Gray Watson
Assignee: Bela Ban
Priority: Minor
Fix For: 2.9
Attachments: NAKACK.java.patch
We have seen NPEs in NAKACK trying to send to hosts who do not have a registered receiver
window. I'd like to apply the attached patch which does a better job of creating a
receiver window on the fly in these circumstances. One issue what the sequence number
should be initialize to -- the patch uses 0 which has worked for us.
Thanks,
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