ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications. 

 The name space provided by ZooKeeper is much like that of a standard file system. A name is a sequence of path elements separated by a slash (/). Every node in ZooKeeper's name space is identified by a path. ZooKeeper supports the concept of watches. Clients can set a watch on a znodes. A watch will be triggered and removed when the znode changes. It supports replication. 

 In case of distributed system, there may be multiple servers interacting with each other. Few may need to share some common resources. Consider a scenario, where a application server wants to know the list of database servers, then it could communicate the Zookeeper server and fetch the required information.

ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications.

ZooKeeper - Centralized service for maintaining configuration information

The Curator Framework is a high-level API that greatly simplifies using ZooKeeper. It adds many features that build on ZooKeeper and handles the complexity of managing connections to the ZooKeeper cluster and retrying operations. Its features include Automatic connection management, Cleaner API, Leader election,
Shared lock, Path cache and watcher, Distributed Queue
and lot more.

Apache Curator - Simplifies using ZooKeeper

Apache Dubbo is a high-performance, light weight, java based RPC framework. Dubbo offers three key functionalities, which include interface based remote call, fault tolerance & load balancing, and automatic service registration & discovery.

Apache Dubbo - High-performance, java based, open source RPC framework.

Dubbo is a high-performance, java based RPC framework open-sourced by Alibaba. As in many RPC systems, dubbo is based around the idea of defining a service, specifying the methods that can be called remotely with their parameters and return types. On the server side, the server implements this interface and runs a dubbo server to handle client calls. On the client side, the client has a stub that provides the same methods as the server.

Dubbo - High-performance, java based, open source RPC framework

jUDDI (pronounced "Judy") is an open source Java implementation of OASIS the Universal Description, Discovery, and Integration (UDDI) specification for (Web) Services. The jUDDI project includes Scout. Scout is an implementation of the JSR 93 - JavaTM API for XML Registries 1.0 (JAXR).
 
jUDDI supports most of the relational database. jUDDI registry supports a clustered deployment configuration. It can be easily integrated with existing authentication systems. It is built on JAXB and JAX-WS standardized interfaces, tested on Apache CXF.

jUDDI (pronounced "Judy") is an open source Java implementation of OASIS the Universal Description, Discovery, and Integration (UDDI) specification for (Web) Services. The jUDDI project includes Scout. Scout is an implementation of the JSR 93 - JavaTM API for XML Registries 1.0 (JAXR).

jUDDI - An open source implementation of OASIS's UDDI v3 specification

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ZooKeeper - Centralized service for maintaining configuration information

Apache Curator - Simplifies using ZooKeeper

Apache Dubbo - High-performance, java based, open source RPC framework.

Dubbo - High-performance, java based, open source RPC framework

jUDDI - An open source implementation of OASIS's UDDI v3 specification

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Projects

ZooKeeper - Centralized service for maintaining configuration information

Apache Curator - Simplifies using ZooKeeper

Apache Dubbo - High-performance, java based, open source RPC framework.

Dubbo - High-performance, java based, open source RPC framework

jUDDI - An open source implementation of OASIS's UDDI v3 specification

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