hazelcast | Open-source distributed computation and storage platform. Real-time Stream Processing Unconference.
kandi X-RAY | hazelcast Summary
kandi X-RAY | hazelcast Summary
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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Top functions reviewed by kandi - BETA
- 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 .
hazelcast Key Features
hazelcast Examples and Code Snippets
@Bean
public HazelcastInstance hazelcastInstance(JHipsterProperties jHipsterProperties) {
log.debug("Configuring Hazelcast");
HazelcastInstance hazelCastInstance = Hazelcast.getHazelcastInstanceByName("gateway");
if (hazel
@Bean
public HazelcastInstance hazelcastInstance(JHipsterProperties jHipsterProperties) {
log.debug("Configuring Hazelcast");
HazelcastInstance hazelCastInstance = Hazelcast.getHazelcastInstanceByName("quotes");
if (hazelC
@Bean
public HazelcastInstance hazelcastInstance(JHipsterProperties jHipsterProperties) {
log.debug("Configuring Hazelcast");
HazelcastInstance hazelCastInstance = Hazelcast.getHazelcastInstanceByName("uaa");
if (hazelCast
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
$ helm search repo database
NAME CHART VERSION APP VERSION DESCRIPTION
stable/cockroachdb 3.0.8 19.2.5 DEPRECATED -- Co
public static void main(String[] args) throws Exception {
String mapName = "so66579138";
String key = "k";
Config config = new Config();
config.getNetworkConfig().getJoin().getAutoDetectionConfig().setE
/**
* 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
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
$ 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
try {
if( !hz.isCpInstanceAvailable() ) {
throw new HazelcastUnavailableException("CPSubsystem is not available");
}
... acquires the lock ...
} catch (HazelcastUnavailableException e) {
LOG.error("Error retrieving
Community Discussions
Trending Discussions on hazelcast
QUESTION
ANSWER
Answered 2022-Apr-05 at 07:56The 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.
QUESTION
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 09:21This 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.
QUESTION
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 22:30Golden 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:
QUESTION
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 11:26The 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.
QUESTION
I'm trying to use CDC for my Postgres Database.
and I have created simple project using Hazelcast Docs example.
...ANSWER
Answered 2021-Oct-13 at 09:42The message says
logical decoding requires wal_level >= logical
In postgresql.conf
you should set the folllowing:
QUESTION
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 07:53Eventualy I could configure the sessionCache-1.0 feature with redisson.
Followings are the configuration flagment for ElastiCache Redis (Cluster Mode Disabled).
server.xml
QUESTION
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 18:46Your 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.
QUESTION
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 15:11Which 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.
QUESTION
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 10:10You code reads as:
QUESTION
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 15:49That'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!
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