I am building a Java based online application using Java and Ignite. Ignite is used an in memory store/cache and also for data persistence for the application. My question is if I should deploy Ignite in a separate server or should it reside int the same server as the application?
You can do it both ways, it's up to you.
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I am developing web application based in Spring. I added Apache ignite in maven dependency.
It is very simple application, which is only 2 rest api.
One is querying by key, which return object. another is put data.
But I have a problem: when I develop additional implementation, I don't know how I can deploy this application.
The application always should be available. but I deploy it to one node, then the node may not available.
Is there good method for distributed memory application deploy?
In your case you will typically start an Ignite server node embedded in your application. You can then start multiple instances of application, and as long as nodes discover each other, they will share the data. For more information about discovery configuration see here: https://apacheignite.readme.io/docs/cluster-config
I am studying gemfire and getting my hands dirty. I came across this concept of deploying jars into gemfire.
My question is why and what type of jars would one deploy in to gemfire cache that would become native to gemfire.
Can you list some scenarios that would clarify this concept of deploying jars in to gemfire ?
You can write Functions that can be executed within the Geode server process. Functions are a quick way of iterating over the data in Geode in parallel OR implementing your custom aggregate.
You can also implement CacheLoaders to load data into Geode and CacheListeners/AsyncEventListeners to write data from Geode into another data source.
Your functions, Listeners, Writers can be bundled in a jar and then deployed on the Geode servers.
Ignite has two modes, one is Server mode, and the other is client mode.I am reading https://apacheignite.readme.io/docs/clients-vs-servers, but didn't get a good understanding of these two modes.
In my opinion, there are two use cases:
If the Ignite is used as an embedded server in a java application, they the Ignite should be in server mode, that is, Ignite should be started with
Ignite ignite = Ignition.start(configFile)
If I have setup an Ignite cluster that are running as standalone processes. Then in my java code, I should start Ignite in client mode, so that the client mode Ignite can connect to the Ignite cluster, and CRUD the cache data that resides in the ignite cluster?
Ignition.setClientMode(true);
Ignite ignite = Ignition.start(configFile)
Yeah, this is correct understanding.
Ignite client mode intended as lightweight mode (which do not store data and do not execute compute tasks). Client node should communicate with a cluster and should not utilize self resources.
Client does not even started without server node presented in topology.
In order to further add to #Makros answer, Ignite Client stores data if near cache is enabled. This is done in order to increase the performance of cache retrievals.
Yeah, you are right in ignite client has IgniteConfiguration.setClientMode(true); and for server IgniteConfiguration.setClientMode(false);, which is default value. if set IgniteConfiguration.setClientMode(false); in you code or forget to set setClientMode(); it will work as server.
We are using apache ignite as a IMDG in our micro services environment.
For scalability and load balancing we are considering to use a service registry like eureka or consul which is supported by spring cloud for the deployed micro services.
There is a concept of service grid providing support for node singleton and cluster singleton in apache ignite.
I also see WCF,weblogic and JBoss to having the same sort of features.
I am trying to understand what these service grids are and if i can use them to achieve the same benefits as the eureka service registry provided by netflix and supported by spring cloud.
Can someone guide if i can achieve the same using service grid in apache ignite.
No, you cannot use Apache Ignite Service Grid for the same purposes as Eureka. Eureka is used for load balancing and service discovery over WAN. Using Ignite clusters spanning over multiple AWS zones and remote client machines is not the most efficient way of using it.
More information on Ignite Service Grid can be found here - http://apacheignite.gridgain.org/docs/service-grid
Thanks!
UPD (for the 1st comment):
You cannot (in most cases) span and effectively use Ignite over WAN networks with high latencies and lower throughput characteristics.
As far as local clusters in non-cloud environments - go ahead! This is the best environment for systems of such kind.
Is it possible to implement a cache in weblogic (10.3.5.0) which is accessible on every instance of a cluster ?
Does weblogic API offers some API with RMI who offers this possibility ?
Is there a framework like ehcache who offers this possibility ?
Oracle Coherence can handle this situation and it comes bundled with WebLogic 10.3.5.
http://docs.oracle.com/cd/E21764_01/apirefs.1111/e13952/taskhelp/coherence/CreateCoherenceServers.html
"Coherence servers (also known as Coherence data nodes) are stand-alone cache servers, dedicated JVM instances responsible for maintaining and managing cached data."