Multiple hazelcast clients

[cka...@gmail.com]

Hi,

I have a 3 node hazelcast cluster running and have a singleton  client initialized like this - HazelcastClient.newHazelcastClient(clientConfig).

My question is - right now, i have only one hazelcast client initialized and all services use it . is it advised to eagerly create a number of hazelcast clients , put them in some threadpool and use in round robin fashion by services. will it increase my throughput and performance?  or is it that - hazelcast internally maintains a threadpool of connections to serve user requests , so i dont need to maintain such threadpool on my own.  I went through some of the source code, but could not find one.

Thanks

Chandra

[Alparslan Avcı]

Hi Chandra,

You do not need to create a number of clients, since Hazelcast client itself is thread-safe and can handle multiple requests internally. You can use the single instance for multiple operations. 

Regards,

Alparslan

[cka...@gmail.com]

Thanks for the reply Alparslan

One more question out of curiosity  - in which class does this multiple request handling logic is defined. can you give me a hint here. Lots of our critical services are now moving to hazelcast, so just wanted to make sure about what code is doing internally

Thanks

Chandra

[Alparslan Avcı]

Hi Chandra,

Hazelcast Client is totally designed as thread-safe and handling multiple requests. Thus, you need to investigate nearly all the codes to see how it is designed. But as a hint, I can suggest you to have a look at `com.hazelcast.client.spi.impl.SmartClientInvocationService`, `com.hazelcast.client.spi.impl.AbstractClientInvocationService`, `com.hazelcast.client.connection.nio.ClientConnectionManagerImpl`, and `com.hazelcast.client.connection.nio.ClientConnection` classes.

You can access the source codes here: https://github.com/hazelcast/hazelcast

Regards,

Alparslan