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Akka 看起来是有前途的, 现在有大量的人使用它.

A custom solution that does not leverage other projects for clustering could also be implemented, especially if JGroups is used for reliable UDP messaging.

Examination of the options

没有利用其他工程的自定义解决方案也能实现这个功能, 特别是如果 JGroups 被用于可靠地  UDP 消息传输时.

上述选项检查

本章节我们看一下每个选项, 看一下每个选项如何定位这些需求In this section we'll look at each of the options and see how it might address the requirements.

JGroups

A newer version of JGroups could be modified to fit the requirements, just as is being done with the initial, incubating, version of Geode.

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So, to sum up, zookeeper could be used as the basis for a membership management service, replacing some of the functionality we currently have built into JGroups.  We would have to implement a fair portion of what we need outside of zookeeper, and using zookeeper comes with some risks.  We'd still need a different solution for UDP messaging.

Akka

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集群

Akka is used by Google 被用于Google Compute Engine and other projects for clustering.  Google has posted that it achieved 1500 nodes in a cluster with stable performance using a simple application and fairly loose timeouts.和其他的集群工程中.  Google 发布博客宣称在一个集群中它能够达到1500个节点, 且性能稳定, 同时超时范围宽松.

Akka 集群的相关文档, 如下所示Akka clustering documentation can be found here: http://doc.akka.io/docs/akka/snapshot/common/cluster.html

Akka uses configured seed-nodes to join the cluster, which is compatible with Geode’s Locator discovery pattern, but they have not solved the concurrent-startup problem for seed nodes that Geode has licked in its JGroups improvements.  The first seed node needs to be brought up before any other seed nodes are started使用配置的种子节点加入到集群中, 它兼容 Geode的 Locator 发现模式, 但是对于种子节点, 它也不能够解决并发启动的问题,  Geode 尝试了JGroups 增强实现.  第一个种子节点需要提出, 在其他的种子节点启动之前.

Akka delivers membership change notifications using an Actor model for individual MemberUp/MemberRemoved events and you can also get the cluster state.  Cluster state is fairly complete and has both a lead-member, a sorted set of members and a set of unreachable members.  One thing missing from cluster state is any form of unique identifier.

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