Re: [pgadmin-support] Issue with a hanging apply process on the replica db after vacuum works on primary

Hi Radovan !

Thank you for the reply. The question is that this table is not a
subject for a massive updates/deletes.

Is there any additional traces except from perf or pg_top to trace what
replica is doing at the particular moment when we are lagging in replay?
To see locks or spins or sleeps etc..

Thank you!

-

Best regards,
Sergey Shchukin

24.02.2015 19:05, Radovan Jablonovsky пишет:
> This looks like more issue for pgsql-general mailing list.
>
> Possible solutions
> 1) Set specific autovacuum parameters on the big table. The autovacuum
> could vacuum table on multiple runs based on the thresholds and cost
> settings
> Example of setting specific values of autovacuum and analyze for
> table. It should be adjusted for your system, work load, table usage, etc:
> alter table "my_schema"."my_big_table" set (fillfactor = 80,
> autovacuum_enabled = true, autovacuum_vacuum_threshold = 200,
> autovacuum_analyze_threshold = 400, autovacuum_vacuum_scale_factor =
> 0.05, autovacuum_analyze_scale_factor = 0.005,
> autovacuum_vacuum_cost_delay = 10, autovacuum_vacuum_cost_limit = 5000);
>
> 2) Could be to partition the large table on master site and vacuum it
> partition by partition.
>
> On Tue, Feb 24, 2015 at 6:42 AM, Sergey Shchukin
> <shchukin(dot)s(dot)a(at)gmail(dot)com <mailto:shchukin(dot)s(dot)a(at)gmail(dot)com>> wrote:
>
> Hi all!
>
> May someone help me with the issue in the apply process on the
> replica. We have a stream replication and after vacuum stops
> working with a big table we get a "freeze" in applying data on the
> replica database. It looks like this:
>
> Tue Feb 24 15:04:51 MSK 2015 Stream:
> MASTER-masterdb:79607136410456 SLAVE:79607136410456
> Replay:79607136339456 :: REPLAY 69 KBytes (00:00:00.294485 seconds)
> Tue Feb 24 15:04:52 MSK 2015 Stream:
> MASTER-masterdb:79607137892672 SLAVE:79607137715392
> Replay:79607137715392 :: REPLAY 173 KBytes (00:00:00.142605 seconds)
> Tue Feb 24 15:04:53 MSK 2015 Stream:
> MASTER-masterdb:79607139327776 SLAVE:79607139241816
> Replay:79607139241816 :: REPLAY 84 KBytes (00:00:00.05223 seconds)
> Tue Feb 24 15:04:54 MSK 2015 Stream:
> MASTER-masterdb:79607141134776 SLAVE:79607141073344
> Replay:79607141080032 :: REPLAY 54 KBytes (00:00:00.010603 seconds)
> Tue Feb 24 15:04:55 MSK 2015 Stream:
> MASTER-masterdb:79607143085176 SLAVE:79607143026440
> Replay:79607143038040 :: REPLAY 46 KBytes (00:00:00.009506 seconds)
> Tue Feb 24 15:04:56 MSK 2015 Stream:
> MASTER-masterdb:79607145111280 SLAVE:79607145021384
> Replay:79607145025664 :: REPLAY 83 KBytes (00:00:00.006795 seconds)
> Tue Feb 24 15:04:57 MSK 2015 Stream:
> MASTER-masterdb:79607146564424 SLAVE:79607146478336
> Replay:79607146501264 :: REPLAY 61 KBytes (00:00:00.00701 seconds)
> Tue Feb 24 15:04:58 MSK 2015 Stream:
> MASTER-masterdb:79607148160680 SLAVE:79607148108352
> Replay:79607147369320 :: REPLAY 773 KBytes (00:00:00.449702 seconds)
> Tue Feb 24 15:04:59 MSK 2015 Stream:
> MASTER-masterdb:79607150220688 SLAVE:79607150159632
> Replay:79607150171312 :: REPLAY 48 KBytes (00:00:00.006594 seconds)
> Tue Feb 24 15:05:00 MSK 2015 Stream:
> MASTER-masterdb:79607152365360 SLAVE:79607152262696
> Replay:79607152285240 :: REPLAY 78 KBytes (00:00:00.007042 seconds)
> Tue Feb 24 15:05:02 MSK 2015 Stream:
> MASTER-masterdb:79607154049848 SLAVE:79607154012624
> Replay:79607153446800 :: REPLAY 589 KBytes (00:00:00.513637 seconds)
> Tue Feb 24 15:05:03 MSK 2015 Stream:
> MASTER-masterdb:79607155229992 SLAVE:79607155187864
> Replay:79607155188312 :: REPLAY 41 KBytes (00:00:00.004773 seconds)
> Tue Feb 24 15:05:04 MSK 2015 Stream:
> MASTER-masterdb:79607156833968 SLAVE:79607156764128
> Replay:79607156785488 :: REPLAY 47 KBytes (00:00:00.006846 seconds)
> Tue Feb 24 15:05:05 MSK 2015 Stream:
> MASTER-masterdb:79607158419848 SLAVE:79607158344856
> Replay:79607158396352 :: REPLAY 23 KBytes (00:00:00.005228 seconds)
> Tue Feb 24 15:05:06 MSK 2015 Stream:
> MASTER-masterdb:79607160004776 SLAVE:79607159962400
> Replay:79607159988888 :: REPLAY 16 KBytes (00:00:00.003162 seconds)
> *--here apply process just stops*
>
> Tue Feb 24 15:05:07 MSK 2015 Stream:
> MASTER-masterdb:79607161592048 SLAVE:79607161550576
> Replay:79607160986064 :: REPLAY 592 KBytes (00:00:00.398376 seconds)
> Tue Feb 24 15:05:08 MSK 2015 Stream:
> MASTER-masterdb:79607163272840 SLAVE:79607163231384
> Replay:79607160986064 :: REPLAY 2233 KBytes (00:00:01.446759 seconds)
> Tue Feb 24 15:05:09 MSK 2015 Stream:
> MASTER-masterdb:79607164958632 SLAVE:79607164904448
> Replay:79607160986064 :: REPLAY 3879 KBytes (00:00:02.497181 seconds)
> Tue Feb 24 15:05:10 MSK 2015 Stream:
> MASTER-masterdb:79607166819560 SLAVE:79607166777712
> Replay:79607160986064 :: REPLAY 5697 KBytes (00:00:03.543107 seconds)
> Tue Feb 24 15:05:11 MSK 2015 Stream:
> MASTER-masterdb:79607168595280 SLAVE:79607168566536
> Replay:79607160986064 :: REPLAY 7431 KBytes (00:00:04.589736 seconds)
> Tue Feb 24 15:05:12 MSK 2015 Stream:
> MASTER-masterdb:79607170372064 SLAVE:79607170252480
> Replay:79607160986064 :: REPLAY 9166 KBytes (00:00:05.635918 seconds)
> Tue Feb 24 15:05:13 MSK 2015 Stream:
> MASTER-masterdb:79607171829480 SLAVE:79607171714144
> Replay:79607160986064 :: REPLAY 10589 KBytes (00:00:06.688115 seconds)
> Tue Feb 24 15:05:14 MSK 2015 Stream:
> MASTER-masterdb:79607173152488 SLAVE:79607173152488
> Replay:79607160986064 :: REPLAY 11881 KBytes (00:00:07.736993 seconds)
> Tue Feb 24 15:05:15 MSK 2015 Stream:
> MASTER-masterdb:79607174149968 SLAVE:79607174149968
> Replay:79607160986064 :: REPLAY 12855 KBytes (00:00:08.78538 seconds)
> Tue Feb 24 15:05:16 MSK 2015 Stream:
> MASTER-masterdb:79607176448344 SLAVE:79607176252088
> Replay:79607160986064 :: REPLAY 15100 KBytes (00:00:09.835184 seconds)
> Tue Feb 24 15:05:17 MSK 2015 Stream:
> MASTER-masterdb:79607177632216 SLAVE:79607177608224
> Replay:79607160986064 :: REPLAY 16256 KBytes (00:00:10.926493 seconds)
> Tue Feb 24 15:05:18 MSK 2015 Stream:
> MASTER-masterdb:79607179432960 SLAVE:79607179378096
> Replay:79607160986064 :: REPLAY 18015 KBytes (00:00:11.97989 seconds)
> Tue Feb 24 15:05:19 MSK 2015 Stream:
> MASTER-masterdb:79607180893384 SLAVE:79607180874256
> Replay:79607160986064 :: REPLAY 19441 KBytes (00:00:13.028921 seconds)
> Tue Feb 24 15:05:20 MSK 2015 Stream:
> MASTER-masterdb:79607182596224 SLAVE:79607182552272
> Replay:79607160986064 :: REPLAY 21104 KBytes (00:00:14.079497 seconds)
> Tue Feb 24 15:05:21 MSK 2015 Stream:
> MASTER-masterdb:79607183935312 SLAVE:79607183902592
> Replay:79607160986064 :: REPLAY 22411 KBytes (00:00:15.127679 seconds)
> Tue Feb 24 15:05:23 MSK 2015 Stream:
> MASTER-masterdb:79607185165880 SLAVE:79607185094032
> Replay:79607160986064 :: REPLAY 23613 KBytes (00:00:16.175132 seconds)
> Tue Feb 24 15:05:24 MSK 2015 Stream:
> MASTER-masterdb:79607187196920 SLAVE:79607187169368
> Replay:79607160986064 :: REPLAY 25596 KBytes (00:00:17.221981 seconds)
> Tue Feb 24 15:05:25 MSK 2015 Stream:
> MASTER-masterdb:79607188943856 SLAVE:79607188885952
> Replay:79607160986064 :: REPLAY 27302 KBytes (00:00:18.274362 seconds)
> Tue Feb 24 15:05:26 MSK 2015 Stream:
> MASTER-masterdb:79607190489400 SLAVE:79607190443160
> Replay:79607160986064 :: REPLAY 28812 KBytes (00:00:19.319987 seconds)
> Tue Feb 24 15:05:27 MSK 2015 Stream:
> MASTER-masterdb:79607192089312 SLAVE:79607192054048
> Replay:79607160986064 :: REPLAY 30374 KBytes (00:00:20.372305 seconds)
> Tue Feb 24 15:05:28 MSK 2015 Stream:
> MASTER-masterdb:79607193736800 SLAVE:79607193690056
> Replay:79607160986064 :: REPLAY 31983 KBytes (00:00:21.421359 seconds)
> Tue Feb 24 15:05:29 MSK 2015 Stream:
> MASTER-masterdb:79607195968648 SLAVE:79607195901296
> Replay:79607160986064 :: REPLAY 34163 KBytes (00:00:22.471334 seconds)
> Tue Feb 24 15:05:30 MSK 2015 Stream:
> MASTER-masterdb:79607197808840 SLAVE:79607197737720
> Replay:79607160986064 :: REPLAY 35960 KBytes (00:00:23.52269 seconds)
> Tue Feb 24 15:05:31 MSK 2015 Stream:
> MASTER-masterdb:79607199571144 SLAVE:79607199495976
> Replay:79607160986064 :: REPLAY 37681 KBytes (00:00:24.577615 seconds)
> Tue Feb 24 15:05:32 MSK 2015 Stream:
> MASTER-masterdb:79607201206104 SLAVE:79607201100392
> Replay:79607160986064 :: REPLAY 39277 KBytes (00:00:25.624604 seconds)
> Tue Feb 24 15:05:33 MSK 2015 Stream:
> MASTER-masterdb:79607203174208 SLAVE:79607203111136
> Replay:79607160986064 :: REPLAY 41199 KBytes (00:00:26.67059 seconds)
> Tue Feb 24 15:05:34 MSK 2015 Stream:
> MASTER-masterdb:79607204792888 SLAVE:79607204741600
> Replay:79607160986064 :: REPLAY 42780 KBytes (00:00:27.719088 seconds)
> Tue Feb 24 15:05:35 MSK 2015 Stream:
> MASTER-masterdb:79607206453216 SLAVE:79607206409032
> Replay:79607160986064 :: REPLAY 44401 KBytes (00:00:28.766647 seconds)
> Tue Feb 24 15:05:36 MSK 2015 Stream:
> MASTER-masterdb:79607208225344 SLAVE:79607208142176
> Replay:79607160986064 :: REPLAY 46132 KBytes (00:00:29.811434 seconds)
>
>
> perf shows the following functions on the top
> + 22.50% postmaster [kernel.kallsyms] [k] copy_user_generic_string
> + 8.48% postmaster postgres [.]
> hash_search_with_hash_value
>
>
> after 10 minutes or so the apply process continue to work
>
> Tue Feb 24 15:13:25 MSK 2015 Stream:
> MASTER-masterdb:79608758742560 SLAVE:79608758718008
> Replay:79607160986064 :: REPLAY 1560309 KBytes (00:08:19.009653
> seconds)
> Tue Feb 24 15:13:26 MSK 2015 Stream:
> MASTER-masterdb:79608759203608 SLAVE:79608759189680
> Replay:79607160986064 :: REPLAY 1560759 KBytes (00:08:20.057877
> seconds)
> Tue Feb 24 15:13:27 MSK 2015 Stream:
> MASTER-masterdb:79608759639680 SLAVE:79608759633224
> Replay:79607160986064 :: REPLAY 1561185 KBytes (00:08:21.104723
> seconds)
> Tue Feb 24 15:13:28 MSK 2015 Stream:
> MASTER-masterdb:79608760271200 SLAVE:79608760264128
> Replay:79607160986064 :: REPLAY 1561802 KBytes (00:08:22.148546
> seconds)
> Tue Feb 24 15:13:30 MSK 2015 Stream:
> MASTER-masterdb:79608760622920 SLAVE:79608760616656
> Replay:79607160986064 :: REPLAY 1562145 KBytes (00:08:23.196645
> seconds)
> Tue Feb 24 15:13:31 MSK 2015 Stream:
> MASTER-masterdb:79608761122040 SLAVE:79608761084584
> Replay:79607160986064 :: REPLAY 1562633 KBytes (00:08:24.240653
> seconds)
> Tue Feb 24 15:13:32 MSK 2015 Stream:
> MASTER-masterdb:79608761434200 SLAVE:79608761426080
> Replay:79607160986064 :: REPLAY 1562938 KBytes (00:08:25.289429
> seconds)
> Tue Feb 24 15:13:33 MSK 2015 Stream:
> MASTER-masterdb:79608761931008 SLAVE:79608761904808
> Replay:79607160986064 :: REPLAY 1563423 KBytes (00:08:26.338498
> seconds)
> *--apply starts*
> Tue Feb 24 15:13:34 MSK 2015 Stream:
> MASTER-masterdb:79608762360568 SLAVE:79608762325712
> Replay:79607163554680 :: REPLAY 1561334 KBytes (00:08:25.702423
> seconds)
> Tue Feb 24 15:13:35 MSK 2015 Stream:
> MASTER-masterdb:79608762891224 SLAVE:79608762885928
> Replay:79607166466488 :: REPLAY 1559008 KBytes (00:08:25.011046
> seconds)
> Tue Feb 24 15:13:36 MSK 2015 Stream:
> MASTER-masterdb:79608763681920 SLAVE:79608763667256
> Replay:79607167054056 :: REPLAY 1559207 KBytes (00:08:25.827531
> seconds)
> Tue Feb 24 15:13:37 MSK 2015 Stream:
> MASTER-masterdb:79608764207088 SLAVE:79608764197744
> Replay:79607175610296 :: REPLAY 1551364 KBytes (00:08:21.182428
> seconds)
> Tue Feb 24 15:13:38 MSK 2015 Stream:
> MASTER-masterdb:79608764857920 SLAVE:79608764832432
> Replay:79607183599632 :: REPLAY 1544197 KBytes (00:08:16.742467
> seconds)
> Tue Feb 24 15:13:39 MSK 2015 Stream:
> MASTER-masterdb:79608765323360 SLAVE:79608765281408
> Replay:79607186862176 :: REPLAY 1541466 KBytes (00:08:15.569874
> seconds)
> Tue Feb 24 15:13:40 MSK 2015 Stream:
> MASTER-masterdb:79608765848240 SLAVE:79608765824520
> Replay:79607186862176 :: REPLAY 1541978 KBytes (00:08:16.620932
> seconds)
>
>
> All this is a result of completion of "vacuum verbose analyze
> master_table" on the master site
>
> Any help would be appreciated
>
> --
> Best regards,
> Sergey Shchukin
>
>
>
>
> --
>
> *Radovan Jablonovsky* | SaaS DBA | Phone 1-403-262-6519 (ext. 7256) |
> Fax 1-403-233-8046
>
>
> *
>
> *Replicon* | Hassle-Free Time & Expense Management Software - 7,300
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