Questions tagged [synchronization]
The synchronization tag has no usage guidance.
152
questions
1
vote
1answer
56 views
How do ISRs and user threads synchronize and share data?
My question is more of educational than an actual coding problem. I tried searching the web, but got little help.
I am trying to learn how to write ISR and understand how they interact with user ...
-3
votes
2answers
76 views
How to scale an application where every read results in a write?
So I am trying to design a simple URL shortener application where every time a URL is queried, it is going to update the number of times it has been queried.
I'm thinking of using MongoDB and I am ...
2
votes
1answer
45 views
Synchronizing video playback in LAN over UDP (no master, same HW & SW)
I have devices thay play video files from their local disk basing on a pre-defined playlist (every device plays exactly the same movie in the same order, every device knows in advance what videos will ...
0
votes
1answer
57 views
Need to test for equality on vector clocks
I've heard about vector clocks and how to test if a message was sent before another message.
E.g. Message A was sent before message B if every element of the vector of message A is smaller or equal ...
-1
votes
2answers
316 views
Race condition in Distributed Systems
We have a set of micro-services that are functionally dependent and have intertwined validation logic. e.g. consider 'Credit-Card' service and 'Loan' service. When user has a credit card then loan ...
0
votes
1answer
120 views
Does the producer-consumer problem appear in both shared memory and distributed memory architectures?
I saw some books on operating system concepts mention the producer-consumer problem in the context of synchronizing concurrent accesses to shared resources. All seem to be in shared memory ...
-5
votes
1answer
57 views
As a developer who runs a small business , can i integrate Quickbooks POS with Shopify
I am a senior developer with C# knowledge, and i have developed many console applications and web applications which integrate with external systems using APIs. now i run my small business and i have ...
0
votes
3answers
42 views
Offline Synchronisation with Changing Access Rights
We got a distributed application where a client syncs certain data portions to its offline storage and performs modifications on it. The data is structured in container entities "Container" and ...
0
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1answer
63 views
Launch threads continuously with predefined interval between threads
I'm currently using a third-party API to fetch results, using a REST client (Retrofit).
The problem is that the amount of requests per second that I can do to the API is limited with interval: I can'...
1
vote
2answers
63 views
Data Synchronization: How can I keep a parent record updated with its child totals efficiently?
I have an application that returns projects. A Project has many Tasks each Task has a field called hours. A project returns the total hours for all the Tasks that belong to it.
My application ...
-2
votes
1answer
113 views
Map synchronization algorithm
Say I have two Map instances in JavaScript (or HashMap in Java, or Dictionary in C#), A and B. I want to synchronize B to A, so that B is a copy of A. I can't copy the reference and I don't want to ...
3
votes
3answers
2k views
How to justify using await instead of .Result() or .Wait() in .NET Core?
Since the inception of .NET Core, console apps, function apps, ASP.NET etc. are not using synchronization context in async methods (so they're synchronizing straight to Thread Pool).
This means that ...
0
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0answers
31 views
How to generate object Ids for both local and online storage?
My application has both offline (SQLite) and online (iCloud) storage. See: Offline First: How Do I Fetch Data?
Now, as stated in my past question above, the application is offline first, and I'm ...
1
vote
1answer
85 views
Offline First: How Do I Fetch Data?
I'm new to this community, I'm glad I found this and so I can ask questions like this one (as per https://meta.stackexchange.com/questions/68384/whats-the-difference-between-stack-overflow-and-...
0
votes
1answer
75 views
Are there pitfalls to using only a remote database for a mobile app?
My research indicates that the ideal database design is:
Mobile App -> Local Database -> Syncing -> Remote Database
using something like PouchDB to do the data replication/syncing.
But ...
0
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0answers
27 views
How to arrange synchronicity reporting in an eventually consistent, distributed system?
Context: A typical corporate landscape with many systems located in different data centers, with firewalls, without uniformised interfacing.
Some data X is being replicated for availability and ...
0
votes
1answer
74 views
Reliable data synchronisation between several systems
We have several systems that hold the same data in different databases. The requirement is to keep the data synced in as much reliable way as possible. Performance isn't a concern because we don't ...
0
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0answers
65 views
Synchronize Data From Multiple Data Sources
Our team is trying to build a predictive maintenance system whose task is to look at a set of events and predict whether these events depict a set of known anomalies or not.
We are at the design ...
5
votes
2answers
1k views
Synchronization of data across microservices
We have 2 to 3 dozen microservices that serve our customers.
These services are deployed in a Kubernetes cluster, and they're only accessible to the outside world through 3 or 4 API gateways.
We ...
2
votes
1answer
120 views
Generic way to describe data synchronization between systems?
Is there a generic way (useful formalisms) to think about data synchronization between two systems, especially in the case of slightly asymmetric roles (eg, one system contain master data, another one ...
1
vote
3answers
290 views
What are criteria for enterprise to have multiple databases (for new project)?
We are working on new enterprise project (multiple activities - online ordering, offline ordering, b2b ordering, accounting processing, secure payment processing, analysis and dynamic pricing and so ...
0
votes
2answers
148 views
Synchronize multiples REST api, centralized into 1 web application
I am developing a web application for a client, connected to 4 differents sources :
E-commerce website
CRM
Emailing platform
Surveys platform
All the sources have REST Api's.
The web application ...
1
vote
1answer
77 views
How state updates to existing instances/sessions are generally done?
This is a very broad question, but maybe someone has a worthwhile response.
There is a general synchronization issue that often has to be solved, but always seems to be difficult. Here's an example:
...
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1answer
188 views
Synchronization method vs private final object for locking in java
Can anyone tell me which one is better approach between synchronization method and private final object in java and why ??
public class kclass {
private final Object myObject = new Object();
...
1
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0answers
37 views
Client synchronization of authentication tokens in parallel connections
In my app server's authentication implementation, an authentication token is generated for every user that has logged in. According to some highly recommended security tips (Implementing Secure User ...
2
votes
1answer
571 views
Best practices for app-cloud synchronization of database representation
I'm planning a cookbook-like Android app that would let users store/add/edit their e-juice recipes, keep track of the ingredients, etc. Internally, I'll be storing the data in a database on the user's ...
2
votes
1answer
160 views
Race conditions in client synchronization
I have a web app whose server creates a Client for each websocket connection. A Client acts as an intermediary between the websocket connection and a single instance of a Hub. The Hub maintains a set ...
0
votes
2answers
168 views
Keep channels online, even though underlying systems are offline?
We have six very old systems where the newest one is built 1995. All these systems have batch jobs running from midnight to 6 AM every night, and these systems are offline. On top of these six systems ...
1
vote
2answers
391 views
How to implement online/offline data synchronisation?
I want to create a desktop application.
The application must be able to accept database transactions even if internet connection is lost, but as soon as internet connection is available the ...
0
votes
1answer
128 views
How to resolve data-binding efficiently
Following this question, the solution to resolve data binding is to use DFS and Topological Sorting. I am not really sure exactly what that means. Here is an animation that roughly demonstrates what I ...
0
votes
2answers
137 views
Struggling with implementing synchronization or concurrency
In my app two components A and B, have their data and state based on the data and state of a 3rd component, component C:
Both A and B can change the data of component C.
Both A and B listen to ...
1
vote
1answer
994 views
How to sync data between two detached systems using rest API?
I own system A, and other entity owns system B. I need to sync system B, based on changes that took place in system A. Data being synced would be spitted into different sets, so I dont have to sync ...
6
votes
4answers
383 views
What are some approaches used in financial applications to prevent deposit/withdrawal sync problems?
I am currently facing a problem with an application that has deposit/withdraw functionality.
The underlying database (Cassandra) offers no read/write locks.
Now suppose user A has deposited 100$...
3
votes
0answers
497 views
File upload sync for offline desktop application. (Electron)
We are making an offline desktop application in Electron that needs to sync when the user goes online.
Sqlite is used as the database when offline and it gets synced to postgres on the server when ...
1
vote
1answer
1k views
Using inner classes to achieve thread-safe behavior without synchronization
I have some classes that contains both immutable (primitive & references) and mutable data, but mutability come from external writes (another process).
To avoid using synchronized on every ...
6
votes
2answers
107 views
Are there any techniques for detecting redundancies a stream of changes to a filesystem?
I'm working on a file-synchronization client that currently produces a stream of changes to the underlying filesystem. That is a stream of create/update/move/delete events is produced for each ...
4
votes
2answers
995 views
Design for client-server synchronisation
Background
I am working on improving the backend design for a video game. The game is live and working fine, but we want to improve various things. As a video game studio, we often do events which ...
4
votes
7answers
829 views
Sync one thousand vector3 across network with minimal bytes?
I am making a game with Unity, and am having problems attempting network synchronisation. Deterministic simulation is impossible because Unity's internal logic is float based. I am trying to make a ...
0
votes
2answers
254 views
State ownership cover everything for a class to be thread safe
As mentioned by Java_author,
When defining which variables form an object's state, we want to consider only the data that object owns....
In many case, ownership and encapsulation go together—...
4
votes
1answer
876 views
Design for syncing data from remote API
I am trying to find a robust and correct solution for syncing data from different sources to my local relational database.
I have different sources of data for eg: CSV, REST API and probably network ...
2
votes
2answers
1k views
Best practice to keep different data sources in sync?
I'm having doubts about how to implement and keep synchronization between two datasources in a distributed system. In my case, I have a service that checks for expired jobs in a repository. If the job ...
3
votes
2answers
1k views
Threads - When to use barrier?
Using python syntax,
threading.Barrier(NUM_THREADS) establishes a control point and all participating threads block until all of the participating “parties” have reached that point. It lets threads ...
3
votes
1answer
2k views
Architecture for real-time application, avoiding duplicate messages for queues with no active consumers
I am designing the architecture of an application which has your typical backend and frontend components. The frontend application must be semi real-time. For this requirement, the backend is pushing ...
1
vote
1answer
62 views
Designing a mechanism to synchronize states with commands despite timing / network inconsistencies
I have two browser clients: A and B. They communicate through a signalling server Server.
A has a clientside heartbeat that signals its ClientState to other clients. ClientState can be one of the ...
3
votes
0answers
129 views
Some “intent”-related questions vis-à-vis Operational Transformation and CRDTs
I’m a little unclear on some questions relating to the "intent" part of concurrent collaboration algorithms (operational transformation and conflict-free replicated data types). Please help!
Strings ...
1
vote
3answers
314 views
How can I wait on multiple processes across users?
I have some code in process A that needs to wait until work completes in other processes that can be running simultaneously under multiple users.
I'm uncertain what is the appropriate ...
3
votes
1answer
1k views
Keeping data between two databases in sync
Let's say I have a forum application running, and I start building a separate web application with a Python web framework. Both applications use their own MySQL databases, which contain their own ...
5
votes
1answer
7k views
How to perform a 2 way sync from many client applications to central server?
I have many client applications that sync up to a central server.
I am using C#, MS SQL server, Win Forms, ASP.NET MVC + API.
I need to learn/figure out how to perform a 2 way sync for data changes ...
7
votes
2answers
7k views
What's the best implementation for offline mobile app synchronization?
We have an Android app written as a Cordova AngularJS SPA which has now grown so that we need to add some work to it meaning we have to improve the synchronization part of the app. The app is mainly ...
1
vote
1answer
52 views
Synchronize a Device without Directly Setting Date/Time?
Setup: I have a number of biometric devices, each of which records 24hr-48hr chunks of data that need to be correctly time-stamped with start date of each recording. Each device needs to be connected ...
