How do I keep a datastructure in sync across several servers in Java?

Posted by sanity on Stack Overflow See other posts from Stack Overflow or by sanity
Published on 2010-06-17T19:48:13Z Indexed on 2010/06/17 19:53 UTC
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Have a Map which contains objects that I want to keep in sync across multiple servers, such that if objects in the map are created, deleted, or modified - this is reflected immediately (ie. within a second or two) across all servers, in a way that can potentially scale up to tens of servers.

Is there a lightweight open source Java tool that can do something like this? I'm aware of Terracotta but it is rather heavy weight for what I need.

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