Move more wikis from s3 to s5
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	Marostegui
	Jul 1 2019, 5:35 AM

Description

As we did in the past at T184805: Move some wikis to s5 - as the DC failover might be approaching we would need to discuss if we want to keep moving some more wikis from s3 to s5 (or to s6) to reduce some load from s3.

Initial figures to find out which wikis could be moved:

P8661 Top s3 wikis by physical size

1	root@db1115.eqiad.wmnet[zarcillo]> select file_path, sum(size) as size FROM backup_files where backup_id = 1901 GROUP BY file_path ORDER BY SIZE DESC LIMIT 20;
2	+---------------+-------------+
3	\| file_path \| size \|
4	+---------------+-------------+
5	\| ruwiktionary \| 24144430804 \|
6	\| mediawikiwiki \| 22529077439 \|
7	\| loginwiki \| 19756739841 \|
8	\| plwiktionary \| 19098819796 \|
9	\| dewiktionary \| 18069974270 \|
10	\| frwikisource \| 15744003279 \|
11	\| enwikisource \| 15316723187 \|
12	\| euwiki \| 14257190411 \|
13	\| ruwikisource \| 13555986560 \|
14	\| dawiki \| 13537448066 \|
15	\| cewiki \| 13426855110 \|
16	\| enwikinews \| 13365490330 \|
17	\| hywiki \| 13267092634 \|
18	\| bewiki \| 11361132645 \|
19	\| mswiki \| 11148073926 \|
20	\| specieswiki \| 11104854093 \|
21	\| elwiki \| 10762890706 \|
22	\| warwiki \| 10698456384 \|
23	\| hiwiki \| 10219741148 \|
24	\| incubatorwiki \| 9629467018 \|
25	+---------------+-------------+
26	20 rows in set (0.12 sec)
27
28	root@db1115.eqiad.wmnet[zarcillo]> select file_path, sum(size) as size FROM backup_files where backup_id = 1897 GROUP BY file_path ORDER BY SIZE DESC LIMIT 20;
29	+---------------+-------------+
30	\| file_path \| size \|
31	+---------------+-------------+
32	\| mediawikiwiki \| 21638206609 \|
33	\| ruwiktionary \| 20839107238 \|
34	\| loginwiki \| 18500473043 \|
35	\| plwiktionary \| 17091109030 \|
36	\| dewiktionary \| 16592277712 \|
37	\| frwikisource \| 14803931297 \|
38	\| enwikisource \| 13998713285 \|
39	\| ruwikisource \| 12573463634 \|
40	\| cewiki \| 12215604647 \|
41	\| dawiki \| 12198392916 \|
42	\| enwikinews \| 11925682228 \|
43	\| hywiki \| 11193870444 \|
44	\| euwiki \| 11147549149 \|
45	\| bewiki \| 10722511174 \|
46	\| warwiki \| 10589307154 \|
47	\| mswiki \| 9967837080 \|
48	\| specieswiki \| 9778234399 \|
49	\| elwiki \| 9734582692 \|
50	\| hiwiki \| 9031959470 \|
51	\| incubatorwiki \| 8940258652 \|
52	+---------------+-------------+
53	20 rows in set (0.12 sec)

P8660 top s3 wikis by compressed size

1	root@db1115.eqiad.wmnet[zarcillo]> select SUBSTRING_INDEX(file_name, '.', 1) as db, sum(size) as size FROM backup_files WHERE backup_id = 1862 and file_name not like '%-schema-create.sql.gz' GROUP BY db ORDER BY size desc LIMIT 20;
2	+---------------+------------+
3	\| db \| size \|
4	+---------------+------------+
5	\| mediawikiwiki \| 4539665654 \|
6	\| loginwiki \| 2829553543 \|
7	\| plwiktionary \| 2358407852 \|
8	\| ruwiktionary \| 2355786729 \|
9	\| frwikisource \| 2315194029 \|
10	\| dewiktionary \| 2192119974 \|
11	\| enwikisource \| 1933894489 \|
12	\| dawiki \| 1818772589 \|
13	\| sourceswiki \| 1795213418 \|
14	\| dewikivoyage \| 1495157942 \|
15	\| skwiki \| 1449949778 \|
16	\| euwiki \| 1377163347 \|
17	\| elwiki \| 1371151371 \|
18	\| bewiki \| 1303039764 \|
19	\| enwikinews \| 1267055352 \|
20	\| simplewiki \| 1266661189 \|
21	\| specieswiki \| 1241517305 \|
22	\| ruwikisource \| 1218843714 \|
23	\| hywiki \| 1213727020 \|
24	\| slwiki \| 1212863732 \|
25	+---------------+------------+
26	20 rows in set (0.20 sec)
27
28	root@db1115.eqiad.wmnet[zarcillo]> select SUBSTRING_INDEX(file_name, '.', 1) as db, sum(size) as size FROM backup_files WHERE backup_id = 1866 and file_name not like '%-schema-create.sql.gz' GROUP BY db ORDER BY size desc LIMIT 20;
29	+---------------+------------+
30	\| db \| size \|
31	+---------------+------------+
32	\| mediawikiwiki \| 4539656355 \|
33	\| loginwiki \| 2829590706 \|
34	\| plwiktionary \| 2358419554 \|
35	\| ruwiktionary \| 2355797164 \|
36	\| frwikisource \| 2315213285 \|
37	\| dewiktionary \| 2204128063 \|
38	\| enwikisource \| 1933912943 \|
39	\| dawiki \| 1818751991 \|
40	\| sourceswiki \| 1795214102 \|
41	\| dewikivoyage \| 1495165313 \|
42	\| skwiki \| 1449944125 \|
43	\| elwiki \| 1371124258 \|
44	\| euwiki \| 1371034939 \|
45	\| bewiki \| 1303054008 \|
46	\| enwikinews \| 1267056284 \|
47	\| simplewiki \| 1266639862 \|
48	\| hywiki \| 1247715009 \|
49	\| specieswiki \| 1241538353 \|
50	\| ruwikisource \| 1218846265 \|
51	\| slwiki \| 1212866336 \|
52	+---------------+------------+
53	20 rows in set (0.21 sec)

P8662 (An Untitled Masterwork)

1	root@db1075[sys]> select table_schema, sum(total_latency) as latency FROM x$schema_table_statistics GROUP BY table_schema ORDER BY latency DESC LIMIT 20;
2	+---------------+-------------------+
3	\| table_schema \| latency \|
4	+---------------+-------------------+
5	\| loginwiki \| 27408946574524658 \|
6	\| heartbeat \| 6598870761431520 \|
7	\| ruwiktionary \| 5763622545480800 \|
8	\| ruwikisource \| 5387585333028756 \|
9	\| enwikisource \| 4369249543450792 \|
10	\| ruwikinews \| 4348592997866546 \|
11	\| cywiki \| 4345551731211834 \|
12	\| dawiki \| 4010741717824270 \|
13	\| specieswiki \| 3772207160558122 \|
14	\| elwiki \| 3411122321623874 \|
15	\| urwiki \| 3097049706021414 \|
16	\| mediawikiwiki \| 2947554293969428 \|
17	\| hiwiki \| 2758917533134906 \|
18	\| hywiki \| 2708470437012054 \|
19	\| azwiki \| 2464451878996822 \|
20	\| etwiki \| 2353731533405538 \|
21	\| cewiki \| 2123102752972630 \|
22	\| simplewiki \| 2120499753908536 \|
23	\| incubatorwiki \| 2078290888311924 \|
24	\| mswiki \| 2075837350189746 \|
25	+---------------+-------------------+
26	20 rows in set (0.14 sec)
27
28	root@db1075[sys]> select table_schema, sum(rows_fetched) as row_reads FROM x$schema_table_statistics GROUP BY table_schema ORDER BY row_reads DESC LIMIT 20;
29	+--------------+------------+
30	\| table_schema \| row_reads \|
31	+--------------+------------+
32	\| heartbeat \| 1987401108 \|
33	\| ruwikinews \| 1178327443 \|
34	\| eswikinews \| 903064930 \|
35	\| ruwiktionary \| 573260200 \|
36	\| enwikisource \| 404222322 \|
37	\| dawiki \| 345920511 \|
38	\| elwiki \| 335306424 \|
39	\| ptwikinews \| 328507775 \|
40	\| urwiki \| 299433460 \|
41	\| specieswiki \| 295739411 \|
42	\| cywiki \| 292026525 \|
43	\| plwikisource \| 261066955 \|
44	\| ruwikisource \| 243940983 \|
45	\| simplewiki \| 225388431 \|
46	\| hiwiki \| 216349589 \|
47	\| etwiki \| 216315626 \|
48	\| azwiki \| 190692054 \|
49	\| mswiki \| 181966577 \|
50	\| hywiki \| 179103722 \|
51	\| zhwikisource \| 175792365 \|
52	+--------------+------------+
53	20 rows in set (0.14 sec)
54
55	root@db1075[sys]> select table_schema, sum(rows_inserted + rows_updated + rows_deleted) as row_writes FROM x$schema_table_statistics GROUP BY table_schema ORDER BY row_writes DESC LIMIT 20;
56	+---------------+------------+
57	\| table_schema \| row_writes \|
58	+---------------+------------+
59	\| cywiki \| 33084444 \|
60	\| incubatorwiki \| 24994139 \|
61	\| ruwikisource \| 21520204 \|
62	\| specieswiki \| 18228253 \|
63	\| loginwiki \| 17504340 \|
64	\| heartbeat \| 14354040 \|
65	\| elwiki \| 13954298 \|
66	\| cewiki \| 12531174 \|
67	\| azwiki \| 12429440 \|
68	\| ruwiktionary \| 12311758 \|
69	\| euwiki \| 11372492 \|
70	\| enwikisource \| 10696608 \|
71	\| dawiki \| 10316007 \|
72	\| hywiki \| 9536860 \|
73	\| dewiktionary \| 6881746 \|
74	\| plwikisource \| 6844363 \|
75	\| hiwiki \| 6397090 \|
76	\| bewiki \| 6359947 \|
77	\| ruwikinews \| 6149052 \|
78	\| ruwikiquote \| 5561521 \|
79	+---------------+------------+
80	20 rows in set (0.14 sec)

Initially we could be looking at:

ruwiktionary
ruwikisource
mediawikiwiki
loginwiki

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Status	Assigned	Task
Declined	None	T226950 Move more wikis from s3 to s5
Resolved	Marostegui	T259004 Move muswiki and mhwiktionary (closed wikis) from s3 to s5
Resolved	Urbanecm	T259432 Create Wikipedia Ladin
Resolved	• Bstorm	T259436 Prepare and check storage layer for lldwiki
Duplicate	None	T260481 Prepare and check storage layer for lldwiki
Resolved	-jem-	T260554 Add lldwiki to Wikistats
Resolved	• Pchelolo	T260556 Add lldwiki to RESTBase
Resolved	KartikMistry	T260557 Add lldwiki to cxserver
Resolved	Ladsgroup	T260558 Add Wikidata support for lldwiki
Resolved	Evrifaessa	T260559 Add support for lldwiki to Pywikibot

Event Timeline

Marostegui created this task.Jul 1 2019, 5:35 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJul 1 2019, 5:35 AM

Marostegui triaged this task as Medium priority.Jul 1 2019, 5:35 AM

Marostegui moved this task from Triage to Backlog on the DBA board.

Marostegui moved this task from Backlog to Pending comment on the DBA board.Aug 1 2019, 1:55 PM

How is possible to loginwiki is so big??

In T226950#5759466, @Zoranzoki21 wrote:

How is possible to loginwiki is so big??

A quick look suggests it's about 20G, with nearly half being logging, and just over 4G for the user table

@Marostegui Why is compressed size bigger than the physical? Or is it supposed to be uncompressed size?

The largest tables on loginwiki are:

user
logging
actor
watchlist
spoofuser

Together they take 2.9 GB compressed, or the 96% of the total size compressed. Note that is small for our standards (large wikis take 300-400GB compressed).

Why is compressed size bigger than the physical

It is not larger- Current physical size is 21493084009 bytes, or around 20GB, while compressed it takes 2936021259, or around 2.7GB. This is typical of the 5x compression ratio of text expected + other inefficiencies on a live database for performance, specially for smaller databases.

In T226950#5759466, @Zoranzoki21 wrote:

How is possible to loginwiki is so big??

All new accounts are auto-created on Meta, LoginWiki, and mediawikiwiki; so it's quite natural that the DB is quite large as all users (virtually) have an account on loginwiki.

Ok, thanks everyone for explaining!

What is the situation today?

In T226950#6083247, @Zoranzoki21 wrote:

What is the situation today?

For logingwiki?

Top used tables:

-rw-rw---- 1 mysql mysql 2.3G Apr 27 05:35 spoofuser.ibd
-rw-rw---- 1 mysql mysql 2.6G Apr 27 05:35 user_properties.ibd
-rw-rw---- 1 mysql mysql 3.2G Apr 27 05:35 actor.ibd
-rw-rw---- 1 mysql mysql 4.9G Apr 27 05:35 watchlist.ibd
-rw-rw---- 1 mysql mysql 7.3G Apr 27 05:35 user.ibd
-rw-rw---- 1 mysql mysql  13G Apr 27 05:35 logging.ibd

In T226950#6083361, @Marostegui wrote:

In T226950#6083247, @Zoranzoki21 wrote:

What is the situation today?

For logingwiki?

Top used tables:

-rw-rw---- 1 mysql mysql 2.3G Apr 27 05:35 spoofuser.ibd
-rw-rw---- 1 mysql mysql 2.6G Apr 27 05:35 user_properties.ibd
-rw-rw---- 1 mysql mysql 3.2G Apr 27 05:35 actor.ibd
-rw-rw---- 1 mysql mysql 4.9G Apr 27 05:35 watchlist.ibd
-rw-rw---- 1 mysql mysql 7.3G Apr 27 05:35 user.ibd
-rw-rw---- 1 mysql mysql  13G Apr 27 05:35 logging.ibd

I mean generally, no just for loginwiki.

We haven't moved any more s3 wikis to s5.
It is a complex procedure and it is normally best tried when we have a DC switchover scheduled.

In T226950#6084473, @Marostegui wrote:

We haven't moved any more s3 wikis to s5.
It is a complex procedure and it is normally best tried when we have a DC switchover scheduled.

Yes, I know that it is complicated.

Here are mentoined s3, s5 and s6. What is with s2?

What does "What is with..." mean exactly? What's your actual underlying question / intention?
(This task is about moving from s3 to s5, not s2. For general info, please see https://wikitech.wikimedia.org/wiki/MariaDB#Core_MediaWiki_databases )

Marostegui added a subtask: T259004: Move muswiki and mhwiktionary (closed wikis) from s3 to s5.Aug 5 2020, 8:54 AM

Marostegui closed subtask T259004: Move muswiki and mhwiktionary (closed wikis) from s3 to s5 as Resolved.Aug 11 2020, 8:57 AM

Kizule mentioned this in T262391: DPL extension has been disabled on Russian Wikinews (09/2020).Sep 12 2020, 7:05 PM

LSobanski subscribed.Sep 15 2020, 11:08 AM

Marostegui moved this task from Pending comment to Backlog on the DBA board.Oct 13 2020, 11:20 AM

Marostegui mentioned this in T101915: Move private wikis to a dedicated cluster.Nov 10 2020, 6:36 AM

Marostegui moved this task from Backlog to Ready on the DBA board.Nov 27 2020, 12:47 PM

Checking in for status of s5 at the moment as it is the default section for new wikis: it has 25 wikis.

I am going to close this as declined, as we are not going to work on this anytime soon. So far it's been enough with having new wikis being created on s5.
If we decide that we need to move things, we can always reopen or create a new one.

Move more wikis from s3 to s5Closed, DeclinedPublicActions

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Move more wikis from s3 to s5
Closed, DeclinedPublic
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