We now bulk-fetch subscription information once from the database
and use it throughout bulk_add_subscriptions in order to avoid
hitting the db O(streams) times.
On my machine this shaved the accounts_register API call from making
66 queries to making 37 queries.
(imported from commit 5dd5ad3f50b2a6edf85b5f1d55ebd697a1c60647)
When we send a message, we send some presence information to Tornado
to help it figure out how to generate emails for idle recipients of
a message. This change limits the presence info to being the
intersection of present users and recipients of the message. It is
just an internal optimization to avoid queueing up unneeded data.
The history behind this feature is that I implemented it a while
back, but I think I made a rebase mistake that sent all the presence
data over the wire, despite having code to filter on recipients.
It was mostly harmless, just leading to some inefficiency which is
now fixed.
(imported from commit 7c8e97705afb299c67b99053909e952fbc823551)
For a 4-person stream, we were hitting the DB 8 times, and 4 of
those queries were to lazily get user.email for the 4 recipients
due to upstream code using only(). I added user_profile__email
to the only() call.
I believe this regression started 9/18, and after pushing this
to prod, we would should look at this graph:
https://stats1.zulip.net/graphs/8274cd84588
(imported from commit 70629cb69fe5955c674ba76482609dfe78e5faaf)
Use stream.num_subscribers() in check_if_a_bot_is_sending_a_message_to_an_empty_stream().
The num_subscribers() function using Django's count() method, which returns
a single row, vs. len() on an iterator of query rows.
(imported from commit 6157fe248945e9288ee71d8cc39fb6dda4e9a247)
Some bots created by us do not have owners. Don't try to send a
message to the nonexistent owner.
(imported from commit ab952eccd7d6c4728e9477a106142214b5c81ca9)
Instead just rely on the 2-minute delay in the management command to
batch conversations.
We've had people report being confused or thinking the feature was
broken when they didn't get e-mails because of our rate-limiting, so
let's see if this is not too overwhelming.
(imported from commit 706ddb07b906b5c2edea1159c04acc2ee6f06e29)
Don't send peer_add notifications to users who are already
getting add notifications, because they will already know
about subscribers.
(imported from commit 726b54ae0e30b71440b17d9c51b026872ea96218)
It only grabs the user_profile_id column now. This leads to a
speedup of about 16x between grabbing large ORM objects vs.
small 1-column dictionaries.
(imported from commit 95150bff3fdcbe250b04f014062224af42a6644f)
Splitting out notify_peers() will give us flexibility for cleaning
up how we notify peers for bulk adds.
(imported from commit e108fa2c432cc1fe54d788c58c82c983e0f2394e)
If you expand subscribers on your settings page, you will now see
a query like this in your postgres logs:
SELECT "zerver_userprofile"."email"
FROM "zerver_subscription" INNER JOIN "zerver_recipient" ON ("zerver_subscription"."recipient_id" = "zerver_recipient"."id") INNER JOIN "zerver_userprofile" ON ("zerver_subscription"."user_profile_id" = "zerver_userprofile"."id") WHERE ("zerver_recipient"."type" = 2 AND "zerver_subscription"."active" = true AND "zerver_recipient"."type_id" = 40 AND "zerver_userprofile"."is_active" = true )
The join's still complicated, but the list of fields is one instead of 40+.
(imported from commit 48de1f888193a4d23fcea52d0b633d134e4a3ff7)
get_subscribers_backend() now calls the new get_subscriber_emails()
function, which just queries the email field:
"zerver_userprofile"."email"
...instead of querying about 40 fields that it never uses.
I was able to verify the query slimming by watching my postgres server log.
Also, you can verify that the ORM does roughly 16x less work using values():
>>> def f(): return [sub.user_profile.email for sub in list(Subscription.objects.all().select_related())]
...
>>> def g(): return [row['user_profile__email'] for row in list(Subscription.objects.all().values('user_profile__email'))]
...
>>> def timeit(func): t = time.time(); func(); return time.time() - t
...
>>> timeit(f)
0.045198917388916016
>>> timeit(g)
0.002752065658569336
(imported from commit a69f690a96d076b323fdfc2f4821b0548bdfac7f)
The get_status_dict_by_realm helper gets called whenever our
realm user_presences cache expires, and it used to query these fields:
"zerver_userpresence"."id", "zerver_userpresence"."user_profile_id", "zerver_userpresence"."client_id", "zerver_userpresence"."timestamp", "zerver_userpresence"."status", "zerver_userprofile"."id", "zerver_userprofile"."password", "zerver_userprofile"."last_login", "zerver_userprofile"."is_superuser", "zerver_userprofile"."email", "zerver_userprofile"."is_staff", "zerver_userprofile"."is_active", "zerver_userprofile"."is_bot", "zerver_userprofile"."date_joined", "zerver_userprofile"."bot_owner_id", "zerver_userprofile"."full_name", "zerver_userprofile"."short_name", "zerver_userprofile"."pointer", "zerver_userprofile"."last_pointer_updater", "zerver_userprofile"."realm_id", "zerver_userprofile"."api_key", "zerver_userprofile"."enable_desktop_notifications", "zerver_userprofile"."enable_sounds", "zerver_userprofile"."enter_sends", "zerver_userprofile"."enable_offline_email_notifications", "zerver_userprofile"."last_reminder", "zerver_userprofile"."rate_limits", "zerver_userprofile"."avatar_source", "zerver_userprofile"."tutorial_status", "zerver_userprofile"."onboarding_steps", "zerver_userprofile"."invites_granted", "zerver_userprofile"."invites_used", "zerver_userprofile"."alert_words", "zerver_userprofile"."muted_topics", "zerver_client"."id", "zerver_client"."name"
Now it queries just the fields it needs:
"zerver_client"."name", "zerver_userpresence"."status", "zerver_userpresence"."timestamp", "zerver_userprofile"."email" FROM "zerver_userpresence"
Also, get_status_dict_by_realm is now namespaced under UserPresence as a static method.
(imported from commit be1266844b6bd28b6c615594796713c026a850a1)
This function gets user presence information, which changes rapidly
and requires a pretty simple query.
(imported from commit f9b9f0f22277335c76eb4371930a4fff2758a240)
The do_send_messages() populates the user_presences data structure
for process_new_message(), so that Tornado code never needs to hit
the database or memcached to get the user presence info.
(imported from commit 194aeaead8fa712297a2ee8aff5aa773b92f1207)
These engagement data will be useful both for making pretty graphs of
how addicted our users are as well as for allowing us to check whether
a new deployment is actually using the product or not.
This measures "number of minutes during which each user had checked
the app within the previous 15 minutes". It should correctly not
count server-initiated reloads.
It's possible that we should use something less aggressive than
mousemove; I'm a little torn on that because you really can check the
app for new messages without doing anything active.
This is somewhat tested but there are a few outstanding issues:
* Mobile apps don't report these data. It should be as easy as having
them send in update_active_status queries with new_user_input=true.
* The semantics of this should be better documented (e.g. the
management script should print out the spec above)x.
(imported from commit ec8b2dc96b180e1951df00490707ae916887178e)
Leo Franchi
Steve Howell
Zev Benjamin
Jessica McKellar
Waseem Daher
Kevin Mehall
Tim Abbott
Scott Feeney
acrefoot