install and puppetize memcached on dbmonitor hosts (tendril frontends)
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	MoritzMuehlenhoff
	Apr 28 2016, 1:41 PM

Description

There's a memcached installed on db1011, but it's currently not puppetised:

[14:49] <jynus> moritzm, I remember sean mentioning some kind of cache for tendril, but I am not sure if he referred to just varnish or some application-level one
[14:50] <jynus> if it is used, it may be used by neon, tendril itself (via a federated table) or maintenance on terbium

It's also currently unused:

[14:49] <volans> moritzm: interesting, STAT curr_connections 10, but no items, all counters are zero, for example: STAT curr_items 0
[14:52] <volans> yeah looks barely used at all: STAT bytes_written 1033 with STAT uptime 23708849 :)

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	Subject	Repo	Branch	Lines +/-
	tendril: Add memcache to tendril web frontend	operations/puppet	production	+5 -1

Customize query in gerrit

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MoritzMuehlenhoff created this task.Apr 28 2016, 1:41 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptApr 28 2016, 1:41 PM

"Low" because there is not something borken, only lack of documentation (it probably is unused).

I would say we can close this as declined or invalid as we have migrated to db1115 and we don't even have memcached installed there and as far as I know we are not even considering doing it so.

root@db1115:~# dpkg -l | grep -i mem
ii  numactl                       2.0.11-2.1                     amd64        NUMA scheduling and memory placement tool

Let's check if the frontend code depends on memcached at dbmonitor, maybe there is code failing and we don't even notice; or it maybe it was never implemented..

Memcached is expected, but on frontend, not on backend:

dbmonitor1001

$_ENV['mc_host'] = '127.0.0.1';
$_ENV['mc_port'] = 11211;

jcrespo renamed this task from memcached on db1011/tendril not puppetised to install and puppetize memcached on dbmonitor hosts (tendril frontends).Feb 25 2018, 12:37 PM

Change 414502 had a related patch set uploaded (by Jcrespo; owner: Jcrespo):
[operations/puppet@production] tendril: Add memcache to tendril web frontend

https://gerrit.wikimedia.org/r/414502

gerritbot added a project: Patch-For-Review.Feb 25 2018, 2:18 PM

Change 414502 merged by Jcrespo:
[operations/puppet@production] tendril: Add memcache to tendril web frontend

https://gerrit.wikimedia.org/r/414502

In T133906#4000472, @gerritbot wrote:

Change 414502 merged by Jcrespo:
[operations/puppet@production] tendril: Add memcache to tendril web frontend

https://gerrit.wikimedia.org/r/414502

After merging this, this task is completed?

dbmonitor1001:~$ echo stats | nc 127.0.0.1 11211
STAT pid 459
STAT uptime 1228445
STAT time 1525870917
STAT version 1.4.21
STAT libevent 2.0.21-stable
STAT pointer_size 64
STAT rusage_user 69.316000
STAT rusage_system 107.968000
STAT curr_connections 15
STAT total_connections 284
STAT connection_structures 17
STAT reserved_fds 20
STAT cmd_get 3574958
STAT cmd_set 976289
STAT cmd_flush 0
STAT cmd_touch 0
STAT get_hits 3238303
STAT get_misses 336655
STAT delete_misses 0
STAT delete_hits 0
STAT incr_misses 0
STAT incr_hits 0
STAT decr_misses 0
STAT decr_hits 0
STAT cas_misses 0
STAT cas_hits 0
STAT cas_badval 0
STAT touch_hits 0
STAT touch_misses 0
STAT auth_cmds 0
STAT auth_errors 0
STAT bytes_read 400097398
STAT bytes_written 1832408323
STAT limit_maxbytes 67108864
STAT accepting_conns 1
STAT listen_disabled_num 0
STAT threads 4
STAT conn_yields 0
STAT hash_power_level 16
STAT hash_bytes 524288
STAT hash_is_expanding 0
STAT malloc_fails 0
STAT bytes 809234
STAT curr_items 290
STAT total_items 976289
STAT expired_unfetched 15380
STAT evicted_unfetched 0
STAT evictions 0
STAT reclaimed 219804
STAT crawler_reclaimed 0
STAT lrutail_reflocked 0
END

db1011 doesn't exist anymore.

install and puppetize memcached on dbmonitor hosts (tendril frontends)Closed, ResolvedPublicActions

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install and puppetize memcached on dbmonitor hosts (tendril frontends)
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