We created redid cluster with redis 5. In our cluster we have 3 master and 6 slave nodes which is recommended by Redis.
Now to connect redid cluster via spring boot, we used
spring.redis.cluster.nodes[0]=192.168.2.4:7379
.
.
This way we configured all redis nodes in spring boot configuration including 3 masters and 6 slave. Want to understand, is it required to pass all redis node configuration to spring boot? Can we just go ahead with master node configurations in spring boot? If possible, please share reason behind the suggestion.
Related
There are lot of tutorials how to use Hazelcast with spring boot in kubernetes for example
Problem is we have 2 data centers, A and B. In both there of these data centers there is kubernetes cluster with application and hazelcast cluster. So the question is how should I configure configure application in data center A to save data in both cluster (A is easy according to tutorial) but how to also configure hazelcast in second cluster ?
You can solve this problem on two layers:
1. Application layer - Your application can store the data in multiple Hazelcast clusters. If you use Hazelcast with Spring Data, then you can configure multiple databases with Spring JPA. Note however that when your application stores the data in the data centre that is in a different region, then the latency will suffer significantly
2. Hazelcast layer - Hazelcast clusters propagate the data changes across multiple data centres using geo-replication (Hazelcast WAN Replication, Enterprise feature); then you connect your application to on Hazelcast cluster only, the one that is co-located with your application.
I have a application using Redis. This system implemented with java spring used jedis package for connection to the redis with the configuration as follow
jedis.pool.host=redisServer-IP
so the application connect to redis server on the redisServer-IP and works fine but, for the lack of memory on a single server and and HA capability I need to use a redis cluster I used docker compose to create a redis cluster using the here.
Also redis cluster working fine with three masters and three replicas.
I just need to understand, the Redis Cluster can work with the single endpoint, because I can only set single endpoint in the above jedis.pool.host configuration, or I need to have a proxy to deal with the redis cluster ?
NOTE: I can not make any changes in my application
I want to use ZooKeeper in order to synchronize my distributed services via ZooKeeper ephemeral nodes.
The idea is the following - every node in the topology on the startup will create ZooKeeper session and ephemeral nodes. On the node restart or failure, these nodes will disappear.
I'm going to implement it using Spring Boot. Right now I'm in doubt what project and Maven dependency to use in order to have ZooKeeper client autoconfiguration, be able to create ZooKeeper session on the application startup, be able to create from this client - ZooKeeper ephemeral nodes and use ZooKeeper transactions.
Right now I'm looking on Spring Cloud Zookeeper/ but I'm not sure is it a right one for this purpose. Could you please point me to the right Spring Boot ZooKeeper project and show the small example how to achieve that I have described above.
What is the simplest way to configure read replicas with Spring Boot and Spring Data JPA? I'm searching a lot and cannot find solution.
AWS RDS Aurora Postgresql gives 2 endpoints:
master (write)
replicas (read)
I want to configure my application to use this endpoints.
Why do you need to configure the read replica with Spring Boot, I am guessing that you just need to connect with the read replica, right?
Have you looked the aws sdk for java?
You need to look over a class there named DescribeDBClusterEndpointsResult.
I am working on Spring XD and GemFire XD. I want to understand how Spring XD's distributed environment works. I know spring xd uses either redis or rabittmq as the transport.
I am clear about this, I have install spring xd and rabittmq on one machine. I changed the redis.properties file and added hostnames.
Do I need to install spring xd on all the machines? If so, after installing, how to bring those up.
On the master machine, I will do ./xd-admin and ./xd-container
How do you start up the nodes (spring xd instances/workers) so that they can listen for instructions from xd-admin?
Please help me on this.
Thanks,
-Suyodhan
Redis is used for analytics as only supported platform. For transport, you need either Redis or Rabbit.
Basically you just need to install Redis and RabbitMQ per their respective documentation. They can be in same or different servers, Ideally you would use their high availability option. For example Redis Sentinal. YOu don't need RabbitMQ unless you want to change the default transport from Redis to Rabbit. Once you install Redis and Rabbit, bring them up and provide their host:port info (and any additional as applicable) to the servers.yml in XD install (in all nodes) and bring up admin and containers. Evrything should work automatically by using zookeeper as the means to manage the distributed runtime.
If you use Spring XD in distributed mode, I assume you have set up zookeeper as well. (If not check this http://docs.spring.io/spring-xd/docs/1.0.0.M7/reference/html/#_setting_up_zookeeper )
Admin and Container instances register themselves with Zookeeper as they come up. Admin queries zookeeper for available containers and assign tasks like deploying modules. Zookeeper is the trick behind Distributed mode.
Hope this helps.
You will install Spring xd one time on one machine, Spring XD will be connected to your hdfs distributed scaled out environment.
You need to start the followings:
1. redis or rappitMQ in your case
2. hsqldb server
3. container
4. admin
when you start spring xd, you need to register the name node firstly using the command:
hadoop config fs --name hdfs://serverip:8020
then you can use any module defined in spring xd (using stream or batch) by specifying its parameters directly without specifying those in the server.yml file.
Moha.