SPQR | dynamic framework for processing high volume data streams | Stream Processing library
kandi X-RAY | SPQR Summary
kandi X-RAY | SPQR Summary
The SPQR ("spooker") framework implements a dynamic framework for processing high volume data streams through pipelines. Established stream processing frameworks such as Apache Storm, Apache Spark Streaming or Apache Samza follow a static approach to building data stream processing pipelines:. This results in pipeline instantiation latencies realistically measured in minutes and not seconds. When a pipeline needs to be changed, the whole process has to be followed again with similar latency. Such a static approach offers an adequate implementation model for long-running, stable, continuous ETL processes on data streams. However, its intrinsic latencies make it unsuitable for pursuing a vision of near-real-time data analytics performed by human experts on near-real-time data prone to erode in value quickly that is usually delivered by data streams. Analysts should be able to process streaming data to gain insight - and once insight has been gained, to easily to refine the processing pipelines for even more insight or to switch or their focus of attention completely without much latency. For example, an online marketing expert should be able to obtain live KPIs on customer activity going on in a shop right now, be able to drill into the activity of a single customer of interest, and then switch focus to different customers or different KPIs without much latency. SPQR provides a foundation for such near-real-time data stream analytics, SPQR proposes an architecture that facilitates ad-hoc instantiation and modification of data stream processing pipelines with subsecond latency. SPQR achieves this by separating the process of. SPQR allows for the code of data stream processing operators to be deployed to a cluster once, with similar latency as traditional frameworks. Once deployed however, these operators can be parameterized, instantiated, and (re)arranged into pipelines with subsecond latency as often as desired and permitted by cluster processing and memory capacity.
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Top functions reviewed by kandi - BETA
- Process a streaming message
- Increments the given field by the given value
- Evaluates the maximum aggregated value
- Evaluates the minimum value of a field
- Waits for a streaming message to be delivered
- Entry point for the microP pipeline
- Convert this instance to a byte array representation
- Waits for a message to be delivered
- Runs the Kafka consumer
- Shuts down the Kafka consumer
- Instantiates a referenced pipeline
- Initialize the component
- Instantiates the referenced pipeline
- Starts SPQ WebSocket server
- Initializes the consumer
- Main loop
- Runs the background thread
- Adds an aggregated value
- Handles incoming messages
- Shutdown the node
- Main method
- Runs the consumer
- Instantiates a new pipeline with the given parameters
- Initializes the pipeline
- Creates or updates a pipeline
- Initializes the component
SPQR Key Features
SPQR Examples and Code Snippets
Community Discussions
Trending Discussions on SPQR
QUESTION
I'm new to Spring Boot and I just started using graphql-spqr for Spring Boot since it allows for easy bootstrapping of Java projects.
However, as per my understanding, GraphQL basically allows the fetching of selected fields from the database. As per the examples, I've seen, this type of selection in the graphql-spqr library happens on the client side. Is there a way to do selection both client-side and server-side so as to speed up the queries?
I've looked into EntityGraph exmaples for GraphQL but they are mostly implemented for complex quieres that involve JOINs. However, nothing exists for simple queries like findAll(), findById() etc.
I would like to use findAll() with the server fetching only the fields as requested by the client. How can I do that?
...ANSWER
Answered 2021-Apr-19 at 08:49What was said in the comments is correct: GraphQL (and hence SPQR, as it's merely a tool to hook the schema up) does not know anything about SQL, databases, JOINs or anything else. It's a communication protocol, the rest is up to you. As for your situation, you'd have to inject the subselection into the resolver and pass it down to SQL. In the simplest case, it can look like this (in pseudo code):
QUESTION
I am using graphql-spqr-spring-boot-starter, version 0.0.5 in my spring boot application.
@GraphQLApi & @GraphQLQuery working fine and I am fetching data on /gui as well.
But as many have faced I am trying to apply the authentication part on graphql server calls. I am using JWT token in my application for REST API authorization/authentication.
So I have token which I suppose can be used for validation here as well.
I have tried using:
...ANSWER
Answered 2021-Apr-17 at 11:07EDIT: GraphQL SPQR Spring Boot starter v0.0.6 fixed the issue and should work out of the box.
This is a bug in the starter. It doesn't properly detect the types when JDK proxies (and not CGLib) are used. I will make sure to fix this for the next release. There's a couple of ways to temporarily work around this, but none of them are nice unfortunately.
You could e.g. force Spring to use CGLIB by e.g.
QUESTION
I'm trying to replicate a report using RMarkdown/LaTeX. Is it possible to add a letterhead to the top of a page in a similar way to the image I've attached? Hoping to find a solution where I can have a letterhead with a logo in it (and where I can easily customise the text and color of the letterhead too).
TIA
I'm using the standard article document class. Here is my YAML in RMarkdown
ANSWER
Answered 2021-Apr-08 at 08:56To give you something to start with, you can use fancyhdr and tikz to design your own header:
QUESTION
I am trying to find SPQR tree of my graph, so I find out that sage can help me. I put my code here https://sagecell.sagemath.org/ (and than in sage programe). Here it is:
...ANSWER
Answered 2021-Apr-06 at 23:44An SPQR tree can only be formed for biconnected graphs. These are connected graphs that stay connected even if any node in the graph is deleted. A graph is not biconnected if it has an articulation vertex (also called a cut vertex), a node that, if removed, leaves the graph disconnected.
The error you're getting indicates that your graph has at least one cut vertex, so it's not possible to form the SPQR tree.
QUESTION
I have a basic Java entity class.
...ANSWER
Answered 2021-Mar-05 at 10:23Oh, that was actually quite simple. Just needed to dig up the right example from the graphql-spqr-examples.
QUESTION
I'm using https://github.com/leangen/graphql-spqr with spring-boot java application. I can reach to alias name easily but how can I reach to original fieldName?
...ANSWER
Answered 2021-Feb-26 at 15:44Posting my original answer here as well.
You want the underlying field names, but from a level above. Still possible, but ugly :(
QUESTION
Working with graphql-spqr and Spring Boot, I'm trying to run the project but I run into this:
...ANSWER
Answered 2020-Nov-27 at 15:30Removing the protobuf Timestamp fields fix the problem!
After changing my return Object it worked out, I had to refactor com.google.protobuf.Timestamp to Date, LocalDate or even String and it works perfectly.
QUESTION
I'm using TexMaker (on Windows 10), using the pdflatex (F6) and yet I can't open the PNG file in the folder of my .tex
ANSWER
Answered 2020-Oct-25 at 14:23Remove the draft option, this prevents images from showing up
QUESTION
How to implement query filters and sorting using Graphql SPQR?
I'm looking for a solution with Graphql SPQR for schema which looks something like this.
...ANSWER
Answered 2020-Sep-25 at 01:14GraphQL SPQR relies on a code-first approach. You need to create your java classes and resolver and annotate them properly:
QUESTION
I created a basic graphql-java app with the spring boot starter and using the graphql spqr library against an MSSQL database utilizing Hibernate and Jpa.
I have an entity called "Task" with 5 fields. I have a simple Jpa repository and a simple Jpa service that calls a "findAllTasks" method. It works great, but if I specify, for example, only one field to query with graphiql, I can see through my SQL log that the select command executed is querying for ALL fields in my Task entity/table, rather than the one I want. Is this expected? I thought graphql only selects the fields you specify in the query command?
Here is my code:
Entity
...ANSWER
Answered 2020-Apr-02 at 08:37You have to make a distinction between your GraphQL API and your database. You defined a query method GraphQL that is called findAllTasks. In consequence, when you call this GraphQL query with any number of fields, it will call the Java method implementation findAllTasks.
You can see that the implementation of this Java method calls taskRepo.findAll(). Therefore, you will fetch all data from your tasks in database.
GraphQL will then filter the data from the tasks fetched by your Java method to match what is asked in the GraphQL query.
In a nutshell, GraphQL is in charge in returning just the fields that you requested, but your implementation is in charge of getting the data from the database.
Disclaimer: I'm not an expert of graphql-spqr, so the upcoming information might not work in your case (as it applied to graphql-java).
If you feel that your implementation is however not efficient enough (here we are really talking about efficiency), you could look into dataloaders.
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