[389-users] MMR issue ...

Tue Nov 13 18:32:23 UTC 2012

On 11/13/2012 11:21 AM, Reinhard Nappert wrote:
>
> The 3 servers do not crash.
>
> I am not sure about the network, though. My first assumption was that 
> the firewall (between A and B) might cause the issue. The latest 
> occurrence (the one, I described) had the firewall removed. I see 
> quite some TCP Retransmissions in the packet captures. Could that be 
> the issue?
>

That could be, although that would mean there are so many tcp 
retransmissions that take such a long time to process that it causes the 
application to think the network connection has timed out.

> -Reinhard
>
> *From:*Rich Megginson [mailto:rmeggins at redhat.com]
> *Sent:* Tuesday, November 13, 2012 1:15 PM
> *To:* General discussion list for the 389 Directory server project.
> *Cc:* Reinhard Nappert
> *Subject:* Re: [389-users] MMR issue ...
>
> On 11/13/2012 11:02 AM, Reinhard Nappert wrote:
>
> Rich,
>
> Do you know what the cause of this issue is?
>
>
> No, I don't know.
>
>
> You would expect that you saw this issue in different deployments, but 
> I only saw it in one instance.
>
> If it turns out that the issue I see is identical the issue, you 
> mentioned, I’d like to know, when it was fixed.
>
>
> Upon further investigation, this does not appear to be the same as 
> https://fedorahosted.org/389/ticket/374
>
> I'm not sure what the problem is.  I've seen timeouts when servers 
> crash or there are network issues.
>
>
> Thanks,
>
> -Reinhard
>
> *From:*389-users-bounces at lists.fedoraproject.org 
> <mailto:389-users-bounces at lists.fedoraproject.org> 
> [mailto:389-users-bounces at lists.fedoraproject.org] *On Behalf Of 
> *Reinhard Nappert
> *Sent:* Tuesday, November 13, 2012 12:22 PM
> *To:* Rich Megginson; General discussion list for the 389 Directory 
> server project.
> *Subject:* Re: [389-users] MMR issue ...
>
> I use 1.2.8.2
>
> *From:*Rich Megginson [mailto:rmeggins at redhat.com]
> *Sent:* Tuesday, November 13, 2012 12:18 PM
> *To:* General discussion list for the 389 Directory server project.
> *Cc:* Reinhard Nappert
> *Subject:* Re: [389-users] MMR issue ...
>
> On 11/13/2012 09:24 AM, Reinhard Nappert wrote:
>
> Hi,
>
> I’ve encountered issues with a MMR setup, which looks like the following:
>
>      A ------- B
>
>        \           /
>
>          \       /
>
>            \   /
>
>              C
>
> The replication works for approximately 24 hours. There are not many 
> changes to the content anyway. After about 1 day, the attribute  value 
> of the type “nsds5replicaLastUpdateStatus”  changes to “1 Can't 
> acquire busy replica “ of the replication agreement object from type 
> “nsDS5ReplicationAgreement”.  I see this message on C for the 
> agreement “C-to-B”.  The start-time of the last update is 01:08:33. 
>  When I check the status on B, it looks fine for “B-to-C” and 
> “B-to-A”, however, the start-time of the last update is stuck at 
> 01:08:36 for “B-to-C”, whereas A gets updated afterwards as well. I 
> don’t have the values for A!
>
> When, I check errors and access on the boxes, I see the following:
>
> Errors on A:
>
> [10/Nov/2012:01:19:31 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Warning: unable to receive endReplication extended operation 
> response (Timed out)
>
> [10/Nov/2012:01:25:01 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Can't contact LDAP server). Will retry 
> later.
>
> [10/Nov/2012:01:25:05 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth resumed
>
> [10/Nov/2012:02:26:29 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:02:31:55 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Can't contact LDAP server). Will retry 
> later.
>
> [10/Nov/2012:02:31:59 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth resumed
>
> [10/Nov/2012:02:43:36 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:03:03:00 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:03:08:24 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Can't contact LDAP server). Will retry 
> later.
>
> [10/Nov/2012:03:11:35 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:03:11:35 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 91 
> (Can't connect to the LDAP server) ((null))
>
> [10/Nov/2012:03:14:45 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:03:14:52 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth resumed
>
> [10/Nov/2012:03:33:29 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:03:33:29 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 91 
> (Can't connect to the LDAP server) ((null))
>
> [10/Nov/2012:03:43:29 -0300] slapi_ldap_bind - Error: timeout after 
> [0.0] seconds reading bind response for [cn=replication,cn=config] 
> mech [SIMPLE]
>
> [10/Nov/2012:03:43:29 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 85 
> (Timed out) ((null))
>
> [10/Nov/2012:03:46:39 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:03:46:39 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 91 
> (Can't connect to the LDAP server) ((null))
>
> [10/Nov/2012:03:46:42 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth resumed
>
> [10/Nov/2012:05:12:02 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:06:16:01 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:06:21:27 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Can't contact LDAP server). Will retry 
> later.
>
> [10/Nov/2012:06:21:46 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth resumed
>
> [10/Nov/2012:06:39:23 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:07:43:45 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:19:38:22 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Timed out). Will retry later.
>
> [10/Nov/2012:19:43:51 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Unable to receive the response for a startReplication 
> extended operation to consumer (Can't contact LDAP server). Will retry 
> later.
>
> [10/Nov/2012:19:43:54 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth resumed
>
> [10/Nov/2012:20:18:21 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:20:18:21 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 91 
> (Can't connect to the LDAP server) ((null))
>
> [10/Nov/2012:20:23:21 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:20:28:21 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:20:33:20 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:20:38:22 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:20:43:22 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:20:48:20 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:21:00:15 -0300] slapi_ldap_bind - Error: timeout after 
> [0.0] seconds reading bind response for [cn=replication,cn=config] 
> mech [SIMPLE]
>
> [10/Nov/2012:21:00:15 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 85 
> (Timed out) ((null))
>
> [10/Nov/2012:21:03:24 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:21:03:24 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 91 
> (Can't connect to the LDAP server) ((null))
>
> [10/Nov/2012:21:06:36 -0300] slapi_ldap_bind - Error: could not send 
> bind request for id [cn=replication,cn=config] mech [SIMPLE]: error 91 
> (Can't connect to the LDAP server) -5961 (TCP connection reset by 
> peer.) 115 (Operation now in progress)
>
> [10/Nov/2012:21:16:39 -0300] slapi_ldap_bind - Error: timeout after 
> [0.0] seconds reading bind response for [cn=replication,cn=config] 
> mech [SIMPLE]
>
> [10/Nov/2012:21:16:39 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth failed: LDAP error 85 
> (Timed out) ((null))
>
> [10/Nov/2012:21:24:14 -0300] NSMMReplicationPlugin - agmt="cn=A-to-B" 
> (B:389): Replication bind with SIMPLE auth resumed
>
> Errors on B:
>
> [10/Nov/2012:01:27:56 -0300] NSMMReplicationPlugin - agmt="cn=B-to-A" 
> (A:389): Replication bind with SIMPLE auth resumed
>
> Errors on C:
>
> No entry for the time
>
> I also analyzed the access files and see the following:
>
> From access on A:
>
> I see replication sessions from B and C, established at 01:00:10 and 
> closed at 01:01:14.
>
> Next replication session from C, established at 01:05:12 and closed at 
> 01:06:12. There was NO session from B.
>
> B and C establish the next replication session at 01:07:52. During the 
> session, a MOD is performed at 01:08:33. C closes this session at 
> 01:09:35. The session from B stays open, and I see a ABANDOM request 
> from A at 01:17:53. Eventually, the session gets closed (no unbind) at 
> 01:23:25.
>
> [10/Nov/2012:01:17:53 -0300] conn=1439 op=3 ABANDON targetop=NOTFOUND 
> msgid=3
>
> Replication sessions from C continue to work fine.
>
> There is one more replication session from B, established at 01:27:56 
> and closed at 01:28:38. After this session, B does not establish any 
> replication session anymore.
>
> From access on B:
>
> I see replication sessions from A and C, established at 01:00:09 and 
> closed at 01:01:14.
>
> Next replication session from C, established at 01:05:12 and closed at 
> 01:06:12. There was NO session from A.
>
> A and C establish the next replication session at 01:07:52. During the 
> session, a MOD is performed at 01:08:33. C closes this session at 
> 01:09:35. The session from A stays open forever!!!
>
> Replication sessions from C continue to work fine.
>
> From access on C:
>
> I see replication sessions from A and B, established at 01:00:09 and 
> closed at 01:01:14.
>
> I don’t see any replication session from the 01:05 time-slot
>
> A and B establish the next replication session at 01:07:53. During the 
> session, a MOD is performed at 01:08:33. A closes this session at 
> 01:09:33 and B closes session at 01:09:38
>
> From now on, I only see replication sessions from A!
>
> Has anybody seen this kind of behavior? Any feedback is highly 
> appreciated.
>
> This looks like https://fedorahosted.org/389/ticket/374
>
> What version of 389-ds-base?
>
> Thanks,
>
> -Reinhard
>
>
>
>
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>
>
>
>
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