On 11/11/2015 04:20 PM, Andrew Krause wrote:
Yesterday I came in to 3 of my 4 freeipa replicas in an unusable state and 
replication was not connecting any of the hosts to each other.  My 
first/primary host was still servicing authentication requests, but the others 
were in varying states of usability.  I've investigated logs on all 4 nodes and 
the only thing I can see is messages like this from when the problem started 
until I restarted all 4 with ipactl stop/ipactl start:

[09/Nov/2015:19:17:16 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:19:16 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:21:19 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:23:19 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:25:21 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:27:21 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:29:26 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:31:26 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:32:37 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc2papp08.somedomain.com" (abcloc2papp08:389): Warning: 
Attempting to release replica, but unable to receive endReplication extended operation 
response from the replica. Error -5 (Timed out)
[09/Nov/2015:19:33:29 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:34:37 -0700] NSMMReplicationPlugin - 
agmt="cn=meToa.somedomain.com" (abcloc2papp08:389): Unable to receive the 
response for a startReplication extended operation to consumer (Timed out). Will retry 
later.
[09/Nov/2015:19:35:28 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc1papp08.somedomain.com" (abcloc1papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.
[09/Nov/2015:19:36:41 -0700] NSMMReplicationPlugin - 
agmt="cn=meToabcloc2papp08.somedomain.com" (abcloc2papp08:389): Unable to 
receive the response for a startReplication extended operation to consumer (Timed out). 
Will retry later.


We've already looked into our network and there was no outage/interruption between sites 
during the timeframe in question.  The only corrective action that was taken was to 
restart each node.  Does anyone know any way I can investigate further what caused this 
issue?  I don't like giving "I don't know" answers for why replication stopped 
working and did not resume by itself.

Hi Andrew,

There are quite periodic (each min or couple of min) networking issues where the primary host fails to process the replication protocol with bcloc[12]papp08. There may be problem with the 3rd replica but it is present in this portion of logs. Most of the time it prevents primary master to establish a replication session so these replica are likely late. The replicas are reachable but do not answer fast enough and the protocol times out.

Default replication timeout is 10m but can be tuned in each replica agreement nsds5ReplicaTimeout.
Is the value set ?

As it was working fine before, it would be interesting to check the replica logs (may be enable replication logging for them) when the timeout occurs. Also, if the problem continue take periodic (under the nsds5ReplicaTimeout value) pstacks of the replica because there may be something that make them busy and unable to answer fast enough.

thanks
thierry
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