etcd4j | Netty client for etcd , the highly-available key value store | Key Value Database library

 by   jurmous Java Version: release-2.16.0 License: Apache-2.0

kandi X-RAY | etcd4j Summary

kandi X-RAY | etcd4j Summary

etcd4j is a Java library typically used in Database, Key Value Database, Docker applications. etcd4j has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub, Maven.

Etcd4j is a client library for etcd, a highly available keystore. This library is based on Netty 4.1 and Java 7. It supports all key based etcd requests, can be secured with SSL and supports defining multiple connection URLs and custom retry policies. It is completely async and works with promises to retrieve the results. It also supports the etcd wait functionality to wait for future changes.
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            kandi-support Support

              etcd4j has a low active ecosystem.
              It has 265 star(s) with 86 fork(s). There are 33 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 14 open issues and 96 have been closed. On average issues are closed in 23 days. There are 5 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of etcd4j is release-2.16.0

            kandi-Quality Quality

              etcd4j has 0 bugs and 0 code smells.

            kandi-Security Security

              etcd4j has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              etcd4j code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              etcd4j is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              etcd4j releases are available to install and integrate.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions, examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed etcd4j and discovered the below as its top functions. This is intended to give you an instant insight into etcd4j implemented functionality, and help decide if they suit your requirements.
            • Gets the content of a key recursively
            • Flatten json
            • Iterate through the Etcd tree and recursively iterate through all nodes in the tree
            • Get the type of a Number
            • Transforms a JsonNode into a String representation
            • Transforms an etcd json into a standard Json representation
            • Send a request to Etcd
            • Connect to server
            • Create HttpRequest and send it to etcdRequest
            • Modify the pipeline for a request
            • Attach Netty promise
            • Load the header values from the provided HttpHeaders
            • Get header as long
            • Puts the content of the given JsonNode into the given node
            • Handles a GET request
            • String representation of this connection state
            • Get the promise
            Get all kandi verified functions for this library.

            etcd4j Key Features

            No Key Features are available at this moment for etcd4j.

            etcd4j Examples and Code Snippets

            No Code Snippets are available at this moment for etcd4j.

            Community Discussions

            QUESTION

            Laravel how to "properly" store & retrieve models in a Redis hash
            Asked 2021-Jul-08 at 17:02

            I'm developing a Laravel application & started using Redis as a caching system. I'm thinking of caching the data of all of a specific model I have, as a user may make an API request that this model is involved in quite often. Would a valid solution be storing each model in a hash, where the field is that record's unique ID, and the values are just the unique model's data, or is this use case too complicated for a simple key value database like Redis? I"m also curious as to how I would create model instances from the hash, when I retrieve all the data from it. Replies are appreciated!

            ...

            ANSWER

            Answered 2021-Jul-08 at 17:02

            Short answer: Yes, you can store a model, or collections, or basically anything in the key-value caching of Redis. As long as the key provided is unique and can be retraced. Redis could even be used as a primary database.

            Long answer

            Ultimately, I think it depends on the implementation. There is a lot of optimization that can be done before someone can/should consider caching all models. For "simple" records that involve large datasets, I would advise to first optimize your queries and code and check the results. Examples:

            1. Select only data you need, not entire models.
            2. Use the Database Query Builder for interacting with the database when targeting large records, rather than Eloquent (Eloquent is significantly slower due to the Active Record pattern).
            3. Consider using the toBase() method. This retrieves all data but does not create the Eloquent model, saving precious resources.
            4. Use tools like the Laravel debugbar to analyze and discover potential long query loads.

            For large datasets that do not change often or optimization is not possible anymore: caching is the way to go!

            There is no right answer here, but maybe this helps you on your way! There are plenty of packages that implement similar behaviour.

            Source https://stackoverflow.com/questions/68305332

            QUESTION

            Can compacted Kafka topic be used as key-value database?
            Asked 2020-Nov-25 at 01:12

            In many articles, I've read that compacted Kafka topics can be used as a database. However, when looking at the Kafka API, I cannot find methods that allow me to query a topic for a value based on a key.

            So, can a compacted Kafka topic be used as a (high performance, read-only) key-value database?

            In my architecture I want to feed a component with a compacted topic. And I'm wondering whether that component needs to have a replica of that topic in its local database, or whether it can use that compacted topic as a key value database instead.

            ...

            ANSWER

            Answered 2020-Nov-25 at 01:12

            Compacted kafka topics themselves and basic Consumer/Producer kafka APIs are not suitable for a key-value database. They are, however, widely used as a backstore to persist KV Database/Cache data, i.e: in a write-through approach for instance. If you need to re-warmup your Cache for some reason, just replay the entire topic to repopulate.

            In the Kafka world you have the Kafka Streams API which allows you to expose the state of your application, i.e: for your KV use case it could be the latest state of an order, by the means of queriable state stores. A state store is an abstraction of a KV Database and are actually implemented using a fast KV database called RocksDB which, in case of disaster, are fully recoverable because it's full data is persisted in a kafka topic, so it's quite resilient as to be a source of the data for your use case.

            Imagine that this is your Kafka Streams Application architecture:

            To be able to query these Kafka Streams state stores you need to bundle an HTTP Server and REST API in your Kafka Streams applications to query its local or remote state store (Kafka distributes/shards data across multiple partitions in a topic to enable parallel processing and high availability, and so does Kafka Streams). Because Kafka Streams API provides the metadata for you to know in which instance the key resides, you can surely query any instance and, if the key exists, a response can be returned regardless of the instance where the key lives.

            With this approach, you can kill two birds in a shot:

            1. Do stateful stream processing at scale with Kafka Streams
            2. Expose its state to external clients in a KV Database query pattern style

            All in a real-time, highly performant, distributed and resilient architecture.

            The images were sourced from a wider article by Robert Schmid where you can find additional details and a prototype to implement queriable state stores with Kafka Streams.

            Notable mention:

            If you are not in the mood to implement all of this using the Kafka Streams API, take a look at ksqlDB from Confluent which provides an even higher level abstraction on top of Kafka Streams just using a cool and simple SQL dialect to achieve the same sort of use case using pull queries. If you want to prototype something really quickly, take a look at this answer by Robin Moffatt or even this blog post to get a grip on its simplicity.

            While ksqlDB is not part of the Apache Kafka project, it's open-source, free and is built on top of the Kafka Streams API.

            Source https://stackoverflow.com/questions/64996101

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install etcd4j

            Setting up a client which connects to default 127.0.0.1:4001 URL. (auto closes Netty eventloop thanks to try-resource block). Setting up your own URLs. Setting up SSL (You need to set up the server with SSL).

            Support

            This project supports any etcd client which supports the etcd v2 api. This is any etcd version up from etcd 0.3 to 2.x.
            Find more information at:

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