hazelcast | Open-source distributed computation and storage platform. Real-time Stream Processing Unconference.

 by   hazelcast Java Version: 5.3.6 License: Non-SPDX

kandi X-RAY | hazelcast Summary

kandi X-RAY | hazelcast Summary

hazelcast is a Java library typically used in Big Data, Kafka, Spark, Hadoop applications. hazelcast has no bugs, it has build file available and it has high support. However hazelcast has 1 vulnerabilities and it has a Non-SPDX License. You can download it from GitHub, Maven.

Hazelcast is a distributed computation and storage platform for consistently low-latency querying, aggregation and stateful computation against event streams and traditional data sources. It allows you to quickly build resource-efficient, real-time applications. You can deploy it at any scale from small edge devices to a large cluster of cloud instances. A cluster of Hazelcast nodes share both the data storage and computational load which can dynamically scale up and down. When you add new nodes to the cluster, the data is automatically rebalanced across the cluster and currently running computational tasks (known as jobs) snapshot their state and scale with processing guarantees.
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            kandi-support Support

              hazelcast has a highly active ecosystem.
              It has 5409 star(s) with 1764 fork(s). There are 309 watchers for this library.
              There were 3 major release(s) in the last 6 months.
              There are 1115 open issues and 7073 have been closed. On average issues are closed in 85 days. There are 178 open pull requests and 0 closed requests.
              It has a positive sentiment in the developer community.
              The latest version of hazelcast is 5.3.6

            kandi-Quality Quality

              hazelcast has 0 bugs and 0 code smells.

            kandi-Security Security

              OutlinedDot
              hazelcast has 1 vulnerability issues reported (1 critical, 0 high, 0 medium, 0 low).
              hazelcast code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              hazelcast has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              hazelcast 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.
              It has 1199345 lines of code, 119794 functions and 10538 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed hazelcast and discovered the below as its top functions. This is intended to give you an instant insight into hazelcast implemented functionality, and help decide if they suit your requirements.
            • Creates the fast read write caches .
            • Initialize map task factories .
            • Creates a portable generic record from a class definition .
            • Called when a snapshot phase is completed .
            • Initialize this instance .
            • Convert a Jetty Rel to a Jetty plan .
            • Submit a job to the coordinator .
            • Create a getter for the given object .
            • Creates an aggregate operation .
            • Handles a execute request .
            Get all kandi verified functions for this library.

            hazelcast Key Features

            No Key Features are available at this moment for hazelcast.

            hazelcast Examples and Code Snippets

            Create Hazelcast instance .
            javadot img1Lines of Code : 48dot img1License : Permissive (MIT License)
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            @Bean
                public HazelcastInstance hazelcastInstance(JHipsterProperties jHipsterProperties) {
                    log.debug("Configuring Hazelcast");
                    HazelcastInstance hazelCastInstance = Hazelcast.getHazelcastInstanceByName("gateway");
                    if (hazel  
            Create Hazelcast instance .
            javadot img2Lines of Code : 48dot img2License : Permissive (MIT License)
            copy iconCopy
            @Bean
                public HazelcastInstance hazelcastInstance(JHipsterProperties jHipsterProperties) {
                    log.debug("Configuring Hazelcast");
                    HazelcastInstance hazelCastInstance = Hazelcast.getHazelcastInstanceByName("quotes");
                    if (hazelC  
            Create Hazelcast instance .
            javadot img3Lines of Code : 48dot img3License : Permissive (MIT License)
            copy iconCopy
            @Bean
                public HazelcastInstance hazelcastInstance(JHipsterProperties jHipsterProperties) {
                    log.debug("Configuring Hazelcast");
                    HazelcastInstance hazelCastInstance = Hazelcast.getHazelcastInstanceByName("uaa");
                    if (hazelCast  
            How to read file only once when app deployed on two nodes
            Javadot img4Lines of Code : 71dot img4License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            public class FileConsumerRoute extends RouteBuilder {
            
            private int delay;
            private String name;
            
            public FileConsumerRoute(String name, int delay) {
                this.name = name;
                this.delay = delay;
            }
            
            @Override
            public void configure() throws Ex
            What is the purpose of attribute keywords in Helm Chart's Chart.yaml?
            Lines of Code : 47dot img5License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            $ helm search repo database
            NAME                            CHART VERSION   APP VERSION             DESCRIPTION                                       
            stable/cockroachdb              3.0.8           19.2.5                  DEPRECATED -- Co
            Stackoverflow when deserializing synchronizedSet from Hazelcast
            Javadot img6Lines of Code : 29dot img6License : Strong Copyleft (CC BY-SA 4.0)
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                public static void main(String[] args) throws Exception {
                    String mapName = "so66579138";
                    String key = "k";
            
                    Config config = new Config();
                    config.getNetworkConfig().getJoin().getAutoDetectionConfig().setE
            Hazelcast Jet IMap remove entry
            Lines of Code : 22dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
                /**
                 * Returns a sink that uses the supplied functions to extract the key
                 * and value with which to update a Hazelcast {@code IMap}. If the map
                 * already contains the key, it applies the given {@code mergeFn} to
                 * re
            How to use aggregations with HazelcastJsonValue?
            Javadot img8Lines of Code : 13dot img8License : Strong Copyleft (CC BY-SA 4.0)
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            Config c = new Config();
            HazelcastInstance hazelCast = Hazelcast.newHazelcastInstance(c);
            IMap map1 = hazelCast.getMap("map1");
            
            HazelcastJsonValue jsv = new HazelcastJsonValue("{\"name\":\"John\", \"age\":31, \"city\":\"New York\"}");
            map
            Check working of an service in kubernetes
            Lines of Code : 36dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            $ kubectl run --help
            Create and run a particular image, possibly replicated.
            
             Creates a deployment or job to manage the created container(s).
            
            Examples:
              # Start a single instance of nginx.
              kubectl run nginx --image=nginx
            
              # Start a 
            Configure Hazelcast CPSubsystem Retries Timeout
            Javadot img10Lines of Code : 29dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            try {
                if( !hz.isCpInstanceAvailable() ) {
                    throw new HazelcastUnavailableException("CPSubsystem is not available");
                }
                ... acquires the lock ...
            } catch (HazelcastUnavailableException e) {
                LOG.error("Error retrieving 

            Community Discussions

            QUESTION

            Hazelcast enable rest-api
            Asked 2022-Apr-05 at 07:56

            I have hazelcast version 3.8.3. I want to enable rest api.

            I wrote in the config:

            ...

            ANSWER

            Answered 2022-Apr-05 at 07:56

            The rest-api section was added in 3.12, you're using 3.8.

            An upgrade should sort it.

            The latest Hazelcast 3 series is 3.12.9, but it's still old.

            Current Hazelcast is Hazelcast 5. If you can upgrade, going to 5.1.1 would be better, the very latest (as of time of writing) -- even faster, more features, etc.

            Source https://stackoverflow.com/questions/71747907

            QUESTION

            Spring Cloud Config behavior difference between docker-compose and Kubernetes
            Asked 2021-Dec-02 at 11:46

            I have a basic spring cloud microservice that I use in my application. Each of the config and discovery services are built as docker containers and when I use docker-compose to run them, everything works fine in that the config server loads the properties files from the mounted directly and displays the below in the logs:

            ...

            ANSWER

            Answered 2021-Dec-01 at 09:21

            This is a community wiki answer posted for better visibility. Feel free to expand it.

            @sg1973 uses minikube which adds a layer between the host and the actual docker containers. Due to this, when trying to mount the local folder, it was actually mounting the folder from minikube instance, which was empty.

            The problem was fixed by including the code as part of the container itself.

            Source https://stackoverflow.com/questions/70011401

            QUESTION

            Non-blocking gets on Hazelcast ReplicatedMap?
            Asked 2021-Nov-24 at 16:57

            We are using a ReplicatedMap in a Hazelcast client. Client and server are both version 4.2.1.

            The map is quite small (<10 entries, each value less than 100 bytes). The client only reads from the map, which is updated infrequently on the server.

            We expected ReplicatedMap.get to be non-blocking, but during a long running performance test, we started getting warnings like the one below from vertx (which monitors for blocked threads). The first error came after 6 hours, so it is not easily reproduced.

            Is there any way to do a non-blocking get? Or do we need to add an EntryListener, which maintains a ConcurrentHashmap?

            Clarification: The real issue here is not blocking vertx (which can be solved by moving the call to a Vertx worker verticle), but rather avoiding delaying the lookup. The business requirement is that we process messages in 50 ms or less, so even if we moved the call to a worker, we would be unable to fulfill that.

            ...

            ANSWER

            Answered 2021-Nov-19 at 22:30

            Golden rule of vertx is not to block the event loop in the app and the blocking tolerance is very low (2 sec). However, since we often need to execute blocking operations vertx offers two solutions. The one that I prefer to use are Worker verticles (https://vertx.io/docs/vertx-core/java/#_verticles under the Worker verticles section). You start them with the following code:

            Source https://stackoverflow.com/questions/70034671

            QUESTION

            Prevent JVM Shutdown while Hazelcast(Embedded) executor service thread is running
            Asked 2021-Oct-25 at 12:59

            I am using Hazelcast IExecutor Service.

            I've written test where I submit task to IExecutorService, while executor service thread is still under execution, JVM is getting terminated and hence Hazelcast Shutdown occurs. Hence, test is failing.

            Is there any way where I can prevent JVM or test termination while hazelcast thread is still under execution?

            ...

            ANSWER

            Answered 2021-Oct-23 at 11:26

            The Javadoc on getExecutorService says there is no defined shutdown behavior:

            Note: Note that it doesn't support invokeAll/Any and doesn't have standard shutdown behavior

            Unfortunately, there is no way to change that. You can look into the implementation details in ExecutionServiceImpl class where you can see it waits for 3 seconds to finish before shutting down the executor. Beware that this can be changed anytime. We are actually looking into making this behavior more defined and maybe even configurable.

            Feel free to file a feature request at GitHub, especially if you shutdown gracefully/terminate, if you access cluster data in the task and what is your expectation if your task takes too long to finish.

            Source https://stackoverflow.com/questions/69685158

            QUESTION

            Hazelcast Change Data Capture with Postgres
            Asked 2021-Oct-13 at 09:42

            I'm trying to use CDC for my Postgres Database.

            and I have created simple project using Hazelcast Docs example.

            https://jet-start.sh/docs/tutorials/cdc-postgres

            ...

            ANSWER

            Answered 2021-Oct-13 at 09:42

            The message says

            logical decoding requires wal_level >= logical

            In postgresql.conf you should set the folllowing:

            Source https://stackoverflow.com/questions/69552328

            QUESTION

            How to cache session with IBM WebSphere Liberty on AWS?
            Asked 2021-Oct-12 at 07:53

            I would like to use AWS Elasticache for Liberty’s session caching, but it looks like Liberty's sessionCache-1.0 feature can only be used with JCache compliant storage. (like Hazelcast, Infinispan, etc...).

            so please let me confirm.

            • Is this correct that it is impossible to use Liberty’s feature (sessionCache-1.0) with AWS Elasticache?
            • If so, do I need to write custom code for session caching in my application?

            If you have any suggestions on how to realize session caching in Liberty, I would appreciate it.

            ...

            ANSWER

            Answered 2021-Oct-12 at 07:53

            Eventualy I could configure the sessionCache-1.0 feature with redisson.
            Followings are the configuration flagment for ElastiCache Redis (Cluster Mode Disabled).

            server.xml

            Source https://stackoverflow.com/questions/69008220

            QUESTION

            Hazelcast Jet "mapFn" must be Serializable Error
            Asked 2021-Oct-11 at 18:46

            Good day, i'm having a problem implementing some code source from github to my project so... i'm trying to build a pipeline, and then create StreamStage to read the sources and build a queuesink with the methods inside the project and i'm always getting the same error "Exception in thread "main" java.lang.IllegalArgumentException: "mapFn" must be serializable"

            i was reading the docs about serialization in Hazelcast Jet and everything seems perfect i just dont know what's the problem inside the project

            This is the attributes and constants:

            ...

            ANSWER

            Answered 2021-Oct-11 at 18:46

            Your applyMerchantRules method is non-static, therefore the lambda captures the enclosing this instance. Seems that you've made FraudDetectionRun serializable in an attempt to fix this, but you should rather make the applyMerchantRules static.

            Source https://stackoverflow.com/questions/69524139

            QUESTION

            Import issue with com.hazelcast.config.MaxSizeConfig
            Asked 2021-Oct-08 at 15:50

            I'm working on a Spring boot tutorial and I'm a bit stuck on this section of the video. The narrator in the video uses the MaxSizeConfig import inside a return statement. Trying out the same line, I'm getting an error saying that MaxSizeConfig can't be resolved to a type. Checking out the docs for hazelcast, the import exists. Could I get some direction in what I'm doing wrong with my code?

            Here's my pom.xml:

            ...

            ANSWER

            Answered 2021-Aug-25 at 15:11

            Which version of hazelcast are you using? More precisely, which is inherited from Spring. The setMaxSizeConfig method has been removed in later versions of hazelcast, for example 4.2 https://docs.hazelcast.org/docs/4.2/javadoc/com/hazelcast/config/MapConfig.html

            But in version 3.6 it was still https://docs.hazelcast.org/docs/3.6/javadoc/com/hazelcast/config/MapConfig.html

            The differences between versions 3 and 4 are significant.

            Source https://stackoverflow.com/questions/68925343

            QUESTION

            Hazelcast Predicate/ SQL query class not found
            Asked 2021-Oct-01 at 10:10

            I am getting class not found exception for SQL query and Predicate search and can't figure out why.

            Exception:

            Method threw 'com.hazelcast.nio.serialization.HazelcastSerializationException' exception. java.lang.ClassNotFoundException: com.mypackage.TestValue

            ...

            ANSWER

            Answered 2021-Oct-01 at 10:10

            QUESTION

            How to use Spring Aggregator in distributed environment?
            Asked 2021-Sep-23 at 15:49

            I have a requirement where an application sends n asynchronous messages for 1 batch in Kafka topic for some processing. I want to integrate the Spring aggregator at Kafka consumers to generate an event after all messages of that batch have been processed. My question is, How would I integrate aggregator in a distributed environment as there are multiple Kafka consumers for the same batch? Should we integrate this with any in-memory Databases like Hazelcast?

            ...

            ANSWER

            Answered 2021-Sep-23 at 15:49

            That's correct. You need to configure that aggregator with some shared persistent store: https://docs.spring.io/spring-integration/docs/current/reference/html/message-routing.html#reaper.

            There is not MessageGroupStore implementation for Hazelcast: https://github.com/spring-projects/spring-integration-extensions/tree/main/spring-integration-hazelcast. But you can consider to use whatever is available for you from our implementations: https://docs.spring.io/spring-integration/docs/current/reference/html/system-management.html#message-store

            The contribution on the matter for Hazelcast extension is welcome!

            Source https://stackoverflow.com/questions/69301879

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

            Vulnerabilities

            No vulnerabilities reported

            Install hazelcast

            Follow the Getting Started Guide to install and start using Hazelcast.

            Support

            Read the documentation for in-depth details about how to install Hazelcast and an overview of the features.
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          • HTTPS

            https://github.com/hazelcast/hazelcast.git

          • CLI

            gh repo clone hazelcast/hazelcast

          • sshUrl

            git@github.com:hazelcast/hazelcast.git

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