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Is there any available implementation of this (like Hadoop for MapReduce)?

There's an Apache incubator project to develop one: Apache Hama at http://incubator.apache.org/hama/ . It's still in pre-alpha, and I haven't been able to find a way to see the source code.

I have looked at this a few times - nothing but some hopeful ideas.

It would be great to have a solid open source implementation, like we have Hadoop for map-reduce infrastructure.

This guy needs to get a native speaker to proofread his writing for him.

Back in May: http://news.ycombinator.com/item?id=1327774

In that discussion, abeppu mentioned a June conference featuring a Pregel paper (http://www.sigmod2010.org/program_sigmod.shtml#res3 ). However, it does not seem to be online.

Google Pregel Graph Processing