fork-join Questions
2
I was studying the oracle docs about the Fork/Join framework when i came across this constructor of ForkJoinPool : ForkJoinPool(int parallelism). The docs said that this was the level of parallelis...
4
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Following up on How to use MDC with thread pools? how can one use MDC with a ForkJoinPool? Specifically, I how can one wrap a ForkJoinTask so MDC values are set before executing a task?
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In the Observables forkJoin documentation, it says that args can be an array but it doesn't list an example doing so:
https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operator...
Medius asked 27/2, 2016 at 22:50
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I am using Rxjs in an angualr-cli application.
in viewer.component.ts
//Other Imports
import { Observable } from 'rxjs/Observable';
//omitting for brevity
export class ViewerComponent implem...
Aboveground asked 25/6, 2017 at 6:32
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I am investigating some performance issues in an app using ForkJoinPool. We've been at it with Dynatrace and there are indications of some blocking operations which last way too long. I cannot find...
Crabbe asked 6/12, 2019 at 9:43
5
As far as I had understood ForkJoinPool, that pool creates a fixed number of threads (default: number of cores) and will never create more threads (unless the application indicates a need for those...
Lorenelorens asked 29/5, 2012 at 10:44
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A thread starvation deadlock occurs in a normal thread pool if all the threads in the pool are waiting for queued tasks in the same pool to complete. ForkJoinPool avoids this problem by stealing wo...
Blastoff asked 26/10, 2014 at 18:11
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In my Angular2-typescript app, I'm using forkJoin to return an Observable only once all the parallel HTTP calls were made.
Issue: the subscription callback keeps being executed indefinitely
Here ...
4
Can someone explain what Fork/Join is?
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What are the benefits of using the new fork/join framework over just simply splitting the big task into N subtasks in the beginning, sending them to a cached thread pool (from Executors) and waitin...
1
I am looking for an implementation of the fork-join model for Python. As Java's ForkJoinPool, it should allow to split (fork) the work of a task into several sub tasks recursively. Once the sub tas...
Spectroscopy asked 1/3, 2019 at 5:28
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What is the low-level difference among using:
ForkJoinPool = new ForkJoinPool(X);
and
ExecutorService ex = Executors.newWorkStealingPool(X);
Where X is the desired level of parallelism, i.e. thre...
Violetavioletta asked 27/12, 2016 at 0:2
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Disclaimer: It's the first time I'm using Java's Fork-Join framework, so I'm not 100% sure I'm using it correctly. Java is also not my main programming language, so this could also be relevant.
...
Sontag asked 1/10, 2018 at 13:2
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I wanted to try out ForkJoinPool in Java 8 so i wrote a small program for searching all the files whose name contains a specific keyword in a given directory.
Program:
public class DirectoryServi...
Lover asked 2/8, 2018 at 10:1
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I just finished reading this post: What's the advantage of a Java-5 ThreadPoolExecutor over a Java-7 ForkJoinPool? and felt that the answer is not straight enough.
Can you explain in simple la...
Leifleifer asked 16/1, 2014 at 8:21
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I am querying a single API endpoint multiple times except with different parameters. For what ever reason some of these requests may fail and return a 500 error. If they do i still want the other r...
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I have some class which is not thread safe:
class ThreadUnsafeClass {
long i;
long incrementAndGet() { return ++i; }
}
(I've used a long as the field here, but we should think of its field as...
Appolonia asked 11/1, 2018 at 11:21
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I am trying to implement a divide-and-conquer solution to some large data. I use fork and join to break down things into threads. However I have a question regarding the fork mechanism: if I set my...
Barytone asked 8/1, 2018 at 20:28
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Here, I've used forkJoin from rxjs to subscribe to an array of observables parallelly. But I want to subscribe to them one by one, What will be the best solution?
Below is my code :
var observabl...
Bluefarb asked 24/9, 2017 at 9:13
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I'm experiencing a TypeScript type check failure when using the forkJoin operator form RxJS.
This is the code in question:
let products = this.http.get(productUrl, { headers: this.headers })
.ma...
Pinniped asked 17/8, 2017 at 15:9
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I have service:
export class ConfigService {
private _config: BehaviorSubject<object> = new BehaviorSubject(null);
public config: Observable<object> = this._config.asObservable();
...
Donata asked 6/4, 2017 at 15:1
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I can't seem to figure out a way to catch/handle errors inside forkJoin while trying to do route resolve.
I've created a route resolver for Account page and It should return 2 requests before rou...
Unrivalled asked 13/3, 2017 at 9:43
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I am using Fork join pool in java for multitasking. Now i came across a situation where, for every task, I need to hit a url then wait for 10 minutes and then again hit another url to read the data...
Fortner asked 22/12, 2016 at 5:51
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In Java 8 there are two ways of starting asynchronous computations - CompletableFuture and ForkJoinTask. They both seem fairly similar - the inner classes of CompletableFuture even extend ForkJoinT...
Sketch asked 26/11, 2015 at 17:43
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I use github API to load user and his followers data in my angular 2 app, but view renders before ngOnInit finishes load data and because of this I receive:
Cannot read property of undefined...
Rigadoon asked 1/6, 2016 at 9:49
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