On 07/14/2015 08:59 PM, Andrew E. Bruno wrote:
On Tue, Jul 14, 2015 at 04:52:10PM +0200, Ludwig Krispenz wrote:
hm, the stack traces show csn_str, which correspond to Jul,8th, Jul,4th, and
Jul,7th - so it looks like it is iterating the changelog over and over
again.
Th consumer side Is "cn=meTosrv-m14-24.ccr.buffalo.edu" - is this the master
?
can you provide the result of the following search from
m14-24.ccr.buffalo.edu adn the server with the high cpu:
ldapsearch -o ldif-wrap=no -x -D ... -w -b "cn=config"
"objectclass=nsds5replica" nsds50ruv
master is srv-m14-24.. here's the results of the ldapsearch:
[srv-m14-24 ~]$ ldapsearch -o ldif-wrap=no -x -D "cn=directory manager" -W -b
"cn=config" "objectclass=nsds5replica" nsds50ruv
# replica, dc\3Dccr\2Cdc\3Dbuffalo\2Cdc\3Dedu, mapping tree, config
dn: cn=replica,cn=dc\3Dccr\2Cdc\3Dbuffalo\2Cdc\3Dedu,cn=mapping tree,cn=config
nsds50ruv: {replicageneration} 5527f711000000040000
nsds50ruv: {replica 4 ldap://srv-m14-24.ccr.buffalo.edu:389}
5527f771000000040000 55a55aed001000040000
nsds50ruv: {replica 5 ldap://srv-m14-26.ccr.buffalo.edu:389}
5537c773000000050000 5591a3d2000700050000
nsds50ruv: {replica 6 ldap://srv-m14-25-02.ccr.buffalo.edu:389}
55943dda000000060000 55945378000200060000
so this is really strange, the master m14-24 has the latest change from
replica 5(m14-26) as: 5591a3d2000700050000
which corresponds to Mon, 29 Jun 2015 20:00:18 GMT
so no update from 14-24 since that did arrive, or could not update the
ruv. So m14-26 tries to replicate all the changes back from that time,
but looks like iit has no success.
is there anything in the logs of m14-24 ? can you see successful mods
with csn=xxxxxxx00050000 ?
# replica, o\3Dipaca, mapping tree, config
dn: cn=replica,cn=o\3Dipaca,cn=mapping tree,cn=config
nsds50ruv: {replicageneration} 5527f74b000000600000
nsds50ruv: {replica 96 ldap://srv-m14-24.ccr.buffalo.edu:389}
5527f754000000600000 55a557f6000000600000
nsds50ruv: {replica 86 ldap://srv-m14-25-02.ccr.buffalo.edu:389}
55943e6e000000560000 55943e6f000100560000
nsds50ruv: {replica 91 ldap://srv-m14-26.ccr.buffalo.edu:389}
5537c7ba0000005b0000 5582c7e40004005b0000
server with high cpu load is srv-m14-26. here's the results of the ldapsearch
from this server:
[srv-m14-26 ~]$ ldapsearch -o ldif-wrap=no -x -D "cn=directory manager" -W -b
"cn=config" "objectclass=nsds5replica" nsds50ruv
# replica, dc\3Dccr\2Cdc\3Dbuffalo\2Cdc\3Dedu, mapping tree, config
dn: cn=replica,cn=dc\3Dccr\2Cdc\3Dbuffalo\2Cdc\3Dedu,cn=mapping tree,cn=config
nsds50ruv: {replicageneration} 5527f711000000040000
nsds50ruv: {replica 5 ldap://srv-m14-26.ccr.buffalo.edu:389}
5537c773000000050000 55a55b47000300050000
nsds50ruv: {replica 4 ldap://srv-m14-24.ccr.buffalo.edu:389}
5527f771000000040000 55a53eb0000a00040000
nsds50ruv: {replica 6 ldap://srv-m14-25-02.ccr.buffalo.edu:389}
55943dda000000060000 55945378000200060000
# replica, o\3Dipaca, mapping tree, config
dn: cn=replica,cn=o\3Dipaca,cn=mapping tree,cn=config
nsds50ruv: {replicageneration} 5527f74b000000600000
nsds50ruv: {replica 91 ldap://srv-m14-26.ccr.buffalo.edu:389}
5537c7ba0000005b0000 5582c7e40004005b0000
nsds50ruv: {replica 96 ldap://srv-m14-24.ccr.buffalo.edu:389}
5527f754000000600000 55a557f6000000600000
nsds50ruv: {replica 86 ldap://srv-m14-25-02.ccr.buffalo.edu:389}
55943e6e000000560000 55943e6f000100560000
srv-m14-25-02 is our 3rd replicate which we recently added back in after it
failed (was added back in 7/1).
Let me know if you need anything else. Thanks for the help.
--Andrew
On 07/14/2015 02:35 PM, Andrew E. Bruno wrote:
On Tue, Jul 14, 2015 at 01:41:57PM +0200, Ludwig Krispenz wrote:
On 07/13/2015 06:36 PM, Andrew E. Bruno wrote:
On Mon, Jul 13, 2015 at 05:29:13PM +0200, Ludwig Krispenz wrote:
On 07/13/2015 05:05 PM, Andrew E. Bruno wrote:
On Mon, Jul 13, 2015 at 04:58:46PM +0200, Ludwig Krispenz wrote:
can you get a pstack of the slapd process along with a top -H to find th
ethread with high cpu usage
Attached is the full stacktrace of the running ns-slapd proccess. top -H
shows this thread (2879) with high cpu usage:
2879 dirsrv 20 0 3819252 1.962g 11680 R 99.9 3.1 8822:10 ns-slapd
this thread is a replication thread sending updates, what is strange is that
the current csn_str is quite old (july, 7th), I can't tell which agreeement
this thread is handling, but looks like it is heavily reading the changeglog
and sending updates. anything changed recently in replication setup ?
Yes, we had one replica fail on (6/19) which we removed (not this one
showing high CPU load). Had to perform some manual cleanup of the ipa-ca
RUVs. Then we added the replica back in on 7/1. Since then, replication
appears to have been running normally between the 3 replicas. We've been
monitoring utilization since 7/1 and only recently seen this spike (past
24 hours or so).
is it still in this state ? or was it a spike.
Yes same state.
if it still is high cpu consuming, could you
- get a few pstack like the one before with some time in between, I would
like to see if it is progressing with the csns or looping on the same one
Attached are a few stacktraces. The thread pegging the cpu is:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2879 dirsrv 20 0 3819252 1.978g 11684 R 99.9 3.2 10148:26 ns-slapd
- check the consumer side. is there anything in the error log ? does the
access log show replication activity from this server
Here's some errors showing up on the first master server rep1 (rep2 is the
server with pegged cpu):
[13/Jul/2015:20:41:51 -0400] NSMMReplicationPlugin -
agmt="cn=masterAgreement1-rep2-pki-tomcat" (rep2:389): Consumer failed to
replay change (uniqueid cb7acfc1-df9211e4-a351aa45-2e06257b, CSN 55a45ad6000000600000):
Operations error (1). Will retry later.
[13/Jul/2015:22:41:51 -0400] NSMMReplicationPlugin -
agmt="cn=masterAgreement1-rep2-pki-tomcat" (rep2:389): Consumer failed to
replay change (uniqueid cb7acfc1-df9211e4-a351aa45-2e06257b, CSN 55a476f6000000600000):
Operations error (1). Will retry later.
[14/Jul/2015:06:56:51 -0400] NSMMReplicationPlugin -
agmt="cn=masterAgreement1-rep2-tomcat" (rep2:389): Consumer failed to replay
change (uniqueid cb7acfc1-df9211e4-a351aa45-2e06257b, CSN 55a4eafa000000600000):
Operations error (1). Will retry later.
Here's some snips from the access log of the rep2:
[14/Jul/2015:08:22:31 -0400] conn=777787 op=9794 EXT oid="2.16.840.1.113730.3.5.5"
name="Netscape Replication End Session"
[14/Jul/2015:08:22:31 -0400] conn=777787 op=9794 RESULT err=0 tag=120
nentries=0 etime=0
[14/Jul/2015:08:22:31 -0400] conn=777787 op=9795 EXT oid="2.16.840.1.113730.3.5.12"
name="replication-multimaster-extop"
[14/Jul/2015:08:22:31 -0400] conn=777787 op=9795 RESULT err=0 tag=120
nentries=0 etime=0
[14/Jul/2015:08:22:33 -0400] conn=777787 op=9796 EXT oid="2.16.840.1.113730.3.5.5"
name="Netscape Replication End Session"
..
[14/Jul/2015:08:23:38 -0400] conn=782341 op=129 RESULT err=0 tag=103 nentries=0
etime=0 csn=55a4ff6c000000050000
..
[14/Jul/2015:08:24:02 -0400] conn=781901 op=1745 RESULT err=0 tag=101
nentries=1 etime=0
[14/Jul/2015:08:24:03 -0400] conn=777787 op=9810 EXT oid="2.16.840.1.113730.3.5.5"
name="Netscape Replication End Session"
[14/Jul/2015:08:24:03 -0400] conn=777787 op=9810 RESULT err=0 tag=120
nentries=0 etime=0
[14/Jul/2015:08:24:03 -0400] conn=777787 op=9811 EXT oid="2.16.840.1.113730.3.5.12"
name="replication-multimaster-extop"
[14/Jul/2015:08:24:03 -0400] conn=777787 op=9811 RESULT err=0 tag=120
nentries=0 etime=0
[14/Jul/2015:08:24:05 -0400] conn=777787 op=9812 EXT oid="2.16.840.1.113730.3.5.5"
name="Netscape Replication End Session"
[14/Jul/2015:08:24:05 -0400] conn=777787 op=9812 RESULT err=0 tag=120
nentries=0 etime=0
[14/Jul/2015:08:24:08 -0400] conn=777787 op=9813 EXT oid="2.16.840.1.113730.3.5.12"
name="replication-multimaster-extop"
[14/Jul/2015:08:24:08 -0400] conn=777787 op=9813 RESULT err=0 tag=120
nentries=0 etime=0
[14/Jul/2015:08:24:10 -0400] conn=777787 op=9814 EXT oid="2.16.840.1.113730.3.5.5"
name="Netscape Replication End Session"
[14/Jul/2015:08:24:10 -0400] conn=777787 op=9814 RESULT err=0 tag=120
nentries=0 etime=0
[14/Jul/2015:08:24:10 -0400] conn=777787 op=9815 EXT oid="2.16.840.1.113730.3.5.12"
name="replication-multimaster-extop"
[14/Jul/2015:08:24:10 -0400] conn=777787 op=9815 RESULT err=0 tag=120
nentries=0 etime=0
and here's some from the error log:
[13/Jul/2015:22:41:49 -0400] DSRetroclPlugin - replog: an error occured while
adding change number 2294859, dn = changenumber=2294859,cn=changelog:
Operations error.
[13/Jul/2015:22:41:49 -0400] retrocl-plugin - retrocl_postob: operation failure
[1]
[13/Jul/2015:23:56:50 -0400] - dn2entry_ext: Failed to get id for
changenumber=2296384,cn=changelog from entryrdn index (-30993)
[13/Jul/2015:23:56:50 -0400] - Operation error fetching
changenumber=2296384,cn=changelog (null), error -30993.
[13/Jul/2015:23:56:50 -0400] DSRetroclPlugin - replog: an error occured while
adding change number 2296384, dn = changenumber=2296384,cn=changelog:
Operations error.
[13/Jul/2015:23:56:50 -0400] retrocl-plugin - retrocl_postob: operation failure
[1]
[14/Jul/2015:06:56:50 -0400] - dn2entry_ext: Failed to get id for
changenumber=2304418,cn=changelog from entryrdn index (-30993)
[14/Jul/2015:06:56:50 -0400] - Operation error fetching
changenumber=2304418,cn=changelog (null), error -30993.
[14/Jul/2015:06:56:50 -0400] DSRetroclPlugin - replog: an error occured while
adding change number 2304418, dn = changenumber=2304418,cn=changelog:
Operations error.
[14/Jul/2015:06:56:50 -0400] retrocl-plugin - retrocl_postob: operation failure
[1]
- eventually enable replication logging: nsslapd-errorlog-level: 8192
On a side note, we get hit with this bug often:
https://www.redhat.com/archives/freeipa-users/2015-July/msg00018.html
(rouge sssd_be processing hammering a replica).
This causes high ns-slapd utilization on the replica and restarting sssd
on the client host immediately fixes the issue. However, in this
case, we're not seeing this behavior.
On 07/13/2015 04:46 PM, Andrew E. Bruno wrote:
We have 3 freeipa-replicas. Centos 7.1.1503, ipa-server 4.1.0-18, and
389-ds 1.3.3.1-16.
Recently, the ns-slapd process on one of our replicas started showing higher
than normal CPU usage. ns-slapd is pegged at high CPU usage more or less
constantly.
Seems very similar to this thread:
https://www.redhat.com/archives/freeipa-users/2015-February/msg00281.html
There are a few errors showing in /var/log/dirsrv/slapd-[domain]/errors (not
sure if these are related):
[13/Jul/2015:02:56:49 -0400] retrocl-plugin - retrocl_postob: operation failure
[1]
[13/Jul/2015:04:11:50 -0400] - dn2entry_ext: Failed to get id for
changenumber=2277387,cn=changelog from entryrdn index (-30993)
[13/Jul/2015:04:11:50 -0400] - Operation error fetching
changenumber=2277387,cn=changelog (null), error -30993.
[13/Jul/2015:04:11:50 -0400] DSRetroclPlugin - replog: an error occured while
adding change number 2277387, dn = changenumber=2277387,cn=changelog:
Operations error.
[13/Jul/2015:04:11:50 -0400] retrocl-plugin - retrocl_postob: operation failure
[1]
[13/Jul/2015:07:41:49 -0400] - Operation error fetching Null DN
(01de36ac-295411e5-b94db2ab-07afbca6), error -30993.
[13/Jul/2015:07:41:49 -0400] - dn2entry_ext: Failed to get id for
changenumber=2281464,cn=changelog from entryrdn index (-30993)
[13/Jul/2015:07:41:49 -0400] - Operation error fetching
changenumber=2281464,cn=changelog (null), error -30993.
[13/Jul/2015:07:41:49 -0400] DSRetroclPlugin - replog: an error occured while
adding change number 2281464, dn = changenumber=2281464,cn=changelog:
Operations error.
[13/Jul/2015:07:41:49 -0400] retrocl-plugin - retrocl_postob: operation failure
[1]
access logs seem to be showing normal activity. Here's the number of open
connections:
# ls -al /proc/`cat /var/run/dirsrv/slapd-[domain].pid`/fd|grep socket|wc -l
62
Note: the other two replicas have much higher open connections (>250) and low
cpu load avgs.
Here's some output of logconv.pl from our most recent access log on the replica
with high cpu load:
Start of Logs: 13/Jul/2015:04:49:18
End of Logs: 13/Jul/2015:10:06:11
Processed Log Time: 5 Hours, 16 Minutes, 53 Seconds
Restarts: 0
Total Connections: 2343
- LDAP Connections: 2120
- LDAPI Connections: 223
- LDAPS Connections: 0
- StartTLS Extended Ops: 45
Secure Protocol Versions:
- TLS1.2 128-bit AES - 45
Peak Concurrent Connections: 22
Total Operations: 111865
Total Results: 111034
Overall Performance: 99.3%
Searches: 95585 (5.03/sec) (301.64/min)
Modifications: 3369 (0.18/sec) (10.63/min)
Adds: 0 (0.00/sec) (0.00/min)
Deletes: 0 (0.00/sec) (0.00/min)
Mod RDNs: 0 (0.00/sec) (0.00/min)
Compares: 0 (0.00/sec) (0.00/min)
Binds: 7082 (0.37/sec) (22.35/min)
Proxied Auth Operations: 0
Persistent Searches: 0
Internal Operations: 0
Entry Operations: 0
Extended Operations: 5317
Abandoned Requests: 416
Smart Referrals Received: 0
VLV Operations: 96
VLV Unindexed Searches: 0
VLV Unindexed Components: 32
SORT Operations: 64
Entire Search Base Queries: 0
Paged Searches: 3882
Unindexed Searches: 0
Unindexed Components: 5
FDs Taken: 2566
FDs Returned: 2643
Highest FD Taken: 249
Broken Pipes: 0
Connections Reset By Peer: 0
Resource Unavailable: 0
Max BER Size Exceeded: 0
Binds: 7082
Unbinds: 2443
- LDAP v2 Binds: 0
- LDAP v3 Binds: 6859
- AUTOBINDs: 223
- SSL Client Binds: 0
- Failed SSL Client Binds: 0
- SASL Binds: 6814
GSSAPI - 6591
EXTERNAL - 223
- Directory Manager Binds: 0
- Anonymous Binds: 6591
- Other Binds: 491
strace timing on the ns-slapd process:
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
94.40 0.346659 5977 58 poll
4.10 0.015057 15057 1 restart_syscall
0.91 0.003353 57 59 59 getpeername
0.49 0.001796 150 12 futex
0.10 0.000364 73 5 read
------ ----------- ----------- --------- --------- ----------------
100.00 0.367229 135 59 total
top output (with threads 'H'):
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2879 dirsrv 20 0 3819252 1.962g 11680 R 99.9 3.1 8822:10 ns-slapd
2895 dirsrv 20 0 3819252 1.962g 11680 R 34.1 3.1 115:10.62 ns-slapd
2889 dirsrv 20 0 3819252 1.962g 11680 R 2.4 3.1 115:34.42 ns-slapd
2917 dirsrv 20 0 3819252 1.962g 11680 S 2.4 3.1 115:26.87 ns-slapd
2898 dirsrv 20 0 3819252 1.962g 11680 S 2.1 3.1 116:33.12 ns-slapd
2904 dirsrv 20 0 3819252 1.962g 11680 S 2.1 3.1 115:08.56 ns-slapd
2892 dirsrv 20 0 3819252 1.962g 11680 S 1.8 3.1 115:33.04 ns-slapd
2897 dirsrv 20 0 3819252 1.962g 11680 R 1.8 3.1 114:54.28 ns-slapd
2914 dirsrv 20 0 3819252 1.962g 11680 R 1.8 3.1 116:03.35 ns-slapd
2907 dirsrv 20 0 3819252 1.962g 11680 S 1.5 3.1 115:42.25 ns-slapd
2910 dirsrv 20 0 3819252 1.962g 11680 R 1.5 3.1 116:01.99 ns-slapd
2870 dirsrv 20 0 3819252 1.962g 11680 R 1.2 3.1 611:30.22 ns-slapd
2890 dirsrv 20 0 3819252 1.962g 11680 S 1.2 3.1 115:18.25 ns-slapd
2891 dirsrv 20 0 3819252 1.962g 11680 S 1.2 3.1 115:22.24 ns-slapd
2899 dirsrv 20 0 3819252 1.962g 11680 R 1.2 3.1 116:11.85 ns-slapd
2888 dirsrv 20 0 3819252 1.962g 11680 S 0.9 3.1 114:51.19 ns-slapd
2896 dirsrv 20 0 3819252 1.962g 11680 R 0.9 3.1 115:46.84 ns-slapd
2915 dirsrv 20 0 3819252 1.962g 11680 S 0.9 3.1 115:49.34 ns-slapd
2887 dirsrv 20 0 3819252 1.962g 11680 R 0.6 3.1 115:49.85 ns-slapd
2894 dirsrv 20 0 3819252 1.962g 11680 S 0.6 3.1 115:58.02 ns-slapd
2911 dirsrv 20 0 3819252 1.962g 11680 S 0.6 3.1 116:22.84 ns-slapd
2913 dirsrv 20 0 3819252 1.962g 11680 S 0.6 3.1 114:43.56 ns-slapd
ns-slapd stays pegged >99%. Trying to figure out what ns-slapd is doing? Any
pointers on where else to look?
Thanks in advance.
--Andrew
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