To Realtime or Not? | Get to know Cloud Firestore #10

Should you use realtime listeners in Cloud Firestore, or one time-fetch calls? In this episode of Get To Know Cloud Firestore, Todd explains the difference between these two methods for fetching data, what kind of impact they would have on your app's performance and battery usage, and how to structure your app to take advantage of a real-time data listener.
Get Realtime Updates → goo.gle/2Y54Enl
This video is also subtitled in Chinese, Indonesian, Italian, French, German, Japanese, Korean, Portuguese, and Spanish.
More episodes on Cloud Firestore → goo.gle/Cloud-...
Subscribe to Firebase → goo.gle/Firebase

[@BreakingBarriers2DIY]

Every time I see this gentleman on a video thumbnail...I know I'm in for an enlightening experience full of understanding of the problems and worries that I have.

[@toastrecon]

These videos are invaluable. Thank you for producing such clear content!

[@AnimateLogo]

The Reddit example for one-time fetch call was spot on. I kept trying to find a use case for it the entire video. Thanks, Todd!

[@Mambo56783]

On the other hand. Now I would like to see Reddit in real time.... at least to see how irritating it is. But having some sense of how much is currently going on in real time would be interesting.

[@Kevin-yw5qr]

@@Mambo56783 you can now, and its just as annoying as you guessed.

[@willroberts1891]

😮

[@Apoka03]

Woah dude I had totally stopped using real-time because I had freaked out when I saw many documents get returned every time a single one of them had changed. This sure clarifies things lol.

[@NGC7603]

The most clear and informative video I've seen in a long time, please keep making these!

[@justdavebz]

great high-level explanation

[@flonmackenzie2876]

Any more of these videos by Todd coming out? They are great. Keep em coming.

[@codinginflow]

That was very enlightening, thank you

[@tanaykamath1415]

yeah ikr!!,your channel too!

[@rckahale]

Great to find you here Sir!

[@tuyenvokhac7943]

Idol

[@roycelennox9211]

@Hector Kyson You are welcome =)

[@DheerajRijhwani]

Need more videos on 🔥 ☁️ firestore database structure and querying.

[@orange_machine264]

This was a great video! Very helpful. Also, I need to buy one of those shirts

[@JonatanWitoszekk]

Awesome video! Made me completely rethink caching solution used in my app.

[@video.jomichaelis]

This was very understandable! Thanks👍🏼

[@kevinliu6002]

Robin Williams, Software Engineer at Google. He's back!!!!!!

[@SociedadAndroide]

Awesome video Todd

[@egopak]

I had to come back to this video a couple of times to finally make up my mind about Realtime vs. Not

[@tilakmadichettitheappdeveloper]

9:12 it happens "automagically"

[@DKPstudios]

Will Firebase ever support indexing and query or will we always have to use a third-party integration to create a search feature in our apps. It's easy enough to break a title of a book or something in an array and perform a query on that, but searching for a specific word in a description is expensive because you either have to break the description up into an array, or use one of these third parties.

[@Jason-ul9tq]

Automagically does sound impressive! 9:12

[@kpertsev]

en.m.wikipedia.org/wiki/Jargon_File

[@immortaleternal5125]

I'm in, i am loving it and all that... but i often find myself unable to convince my employer to use firebase because i fail to answer all their "What if?s", which are mostly related to server cost and what happens when exceeding the free plan's limits.

[@Kubaguette]

I love this guy, I love firebase, I would like to hug him sooo much and thank the team behind firebase haha :)

[@rupayanc]

hi ... is there any king of logger which i can use to monitor the no of reads and writes in firestore?

[@rckahale]

I love how i get to understand concepts & laugh at the same time.

[@ectoid6316]

Any idea if there is support for Go, there were a few samples that I found, which seemed to be still in development. However the website says // Snippet coming soon. Any info on the matter ?

[@baixartv]

Another level of explanation. Thanks!

[@jesselima_dev]

I love these videos. Very technical and fun. :D

[@ProfessionalTycoons]

such a good series of video

[@_dinesh]

Thank you for the explanation. The question is.... Under the hood does firestore use websockets to push the data to the client? Or is it GRPC.. The term listener seems pretty generic.

[@lokisingh9944]

he's really good

[@taufeekahmadkhan3953]

Does this liveSync works on same thread or different thread?

[@SteveKovacs]

This seems perfect for my use case until he brought up pagination/infinite scroll example. Can someone explain why that would make a difference? Or direct me to the explanation of that? Thanks ahead of time.

[@ginger-viking]

I love these videos

[@AmitJayant]

Very informative video. Thanks. Btw... where can i get that t-shirt?

[@laudijksterhuis]

Automagically... love it 😂

[@tockra95]

How high is the traffic if there is no update in the collection? Does a onSnapshot generates traffic throw ping and some other internal reasons?

[@magnet1te]

Fantastic video series!!! Now I want to do realtime in Flutter but I have a problem... Flutter Firestore plugin has no 'onSnapshots'. It has a 'snapshot' and a 'listener'. 'Snapshot' does not seem to start the listener. And theFlutter widget StreamBuilder seems to manage listening, turning it on and off. Have I misunderstood it all or is it a simple workaround?

[@basketballico508]

Hi, if I write data offline, this update the cached data and then sync with server, but when is offline the user can write data that break the security rules and the cached data is wrong 😞, when is online the new sync remove this wrong data, but I don't like this :(, I want to show also a permission denied error when is offline

[@AnimateLogo]

Todd explained a similar scenario in another video. Look it up.

[@DenisTRUFFAUT]

Good point. Validating some rules offline could be possible with a strong CSP (ensuring no JS alteration on client side), but to really evaluate rules you would have to download the rules validator (I mean, js files are already super fat, nearly 1 Mb). Plus, you still won't be able to validate rules that make database reads ('cause you are offline)

[@8Kexperience]

Awesome explanation! Quick question: realtime make sense when multiple clients working on same data, realtime is keeping everything synced. What about single device, when I call set or update on same client/browser tab I get the update too. Is it costing me extra read.

[@flechs-software]

Find an answer on this?

[@8Kexperience]

@@flechs-software nope

[@flechs-software]

@@8Kexperience FWIW: I found a relevant SO question here: stackoverflow.com/questions/55919435/do-local-writes-to-firebase-rtdb-or-firestore-with-attached-listeners-cost-a-rea But I don't think the answer is correct :/

[@8Kexperience]

@@flechs-software :'(

[@manjunathpatil2489]

Tq u sir u saved my week

[@EnglishTurkishExpert]

Any example (in java) to use addSnapshotListener with LiveData? I am trying to observe when and if data changes in FireStore database and failing miserably. There is almost no examples on the net. I found a few but they are in Kotlin, which I have no idea how to convert them into Java code.

[@inaglimpse]

Thanks for the great content. A question: does realtime listeners will be triggered on changes to subcollections? I have an issue but don't know why my listener is not triggered.

[@sushantchandla]

Thanks ... 😄😄😄😄

[@guasaentertainment9694]

But if I need to make a call in real time within another. For example, I want the comments to be heard when new Posts are added and in turn I want the comments of each post to be heard in real time. Thanks

[@matthiasgehrmann1573]

thx !

[@shubhamsharma0099]

pls tell me that how to update OR send player vectors (movements) to my real time database in firebase asa i'm trying to make a simple multiplayer game using firebase RTDB and also how top get that movement value back to show other players in realtime? pls help there i no such tutorial for this

[@guanacodevs]

Automagically!!!

[@duanehodges3146]

How do I only get new documents from firebase using .onSnapshot when used with .limitToLast for pagination I'm trying to implement a chat app with infinite scroll using Firebase. The problem is that if I don't empty my messages array when a new message is added then they're duplicated. If I empty the messages array then it doesn't keep the previous messages.

[@bazoozoo1186]

what is name of this guy? I want to search and watch all his videos. there is no name even at the description :(

[@MrDasebasto]

Todd Kerpelman

[@intentionalvideos456]

Hi Guys, This one time fetch means normal http calls we will be making right the real time means calls through cloud class , Am i correct ?

[@JnanadasKKunjan]

thanks

[@godrugal1]

in android for example, if I have a real-time listener in an activity A, and if I went to activity B then I went back to activity A. will Activity A read all the data again or will it read all data from cache and only get updates from the updated documents? from what I know is that it will read all data again is that right?

[@ranjeetkumaryadav3978]

​@@ToddKerpelmanCorp Can you explain "ton of time elapsed"? If user navigates 10 times between going from A to B to A in span of two mins,then how many times it will get the all data gain from server.

[@Kevin-yw5qr]

10:50 speak of the devil, Reddit just rolled out that feature and its incredibly annoying.

[@aminelouni]

*The one million dollar question :* How to paginate in real time

[@seccat]

OK, let's do this... Leroy Jenkins!

[@el7284]

Amazing, but still way too expensive

[@lidory98]

Anyone knows this guy name by any chance?

[@yeilmusic]

so i need remove listener for avoid 30 minuts offline .. :/ ?¿?¿

[@planktonfun1]

You don't have to sell it to me, I already bought it

[@lukecross5439]

Firestore is better than Realtime Database in everything?

[@afj9966]

9:11 auto-magically

[@AymanShaabanELsayedDEVELOPER]

Hi, @Todd Kerpelman Please help me,i need to support my firestore java chat app with fcm Give me an link that helps me, Thanks

[@too-many-phils]

realtime UX is much more complicated than this presumes. I strongly disagree it should be the default experience

[@modoestudiopa2062]

This was useless for me, not that the information wasn't well presented, or the info itself was useless, the useless part is that seeing that this is in the page of the documentation for the topic, I was expecting at least a little bit of code explanation

[@hawarhekmat1174]

Flutter and firebase the magic 🪄✨🪄✨

[@Firebase]

We're so glad you enjoyed the video, Hawar! Check out more episodes on Cloud Firestore here: goo.gle/Cloud-Firestore 😎

[@hawarhekmat1174]

@@Firebase thank you so much, I'm enjoying it more than anything.