Which open source java projects do you know to be high performance or real time performance? I tried hard to find them on github or google, but couldn't find suitable.
I want to learn from this projects, so will not be as a newbie on my interviews ;)
So far I am going to stick to Play Framework project. Are there better options?

P.S. I've seen possible duplicate, but I am looking for a very load intensive applications. As people in Deutsche Bank write.

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    Are you looking for specific kinds of high performance projects? and are you wanting to contribute to them or just learn? – Daniel Apr 11 '13 at 5:17
  • I want to learn, to contribute is the next step. High performance based on the high load at the input and fast processing of the input data. – Anatoly D. Apr 11 '13 at 7:00
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    Is Hadoop of the high performance kind? – Florian Margaine Apr 11 '13 at 7:09
  • Florian! Thanks. I missed that Hadoop is open source. That is definitely what I am looking for :) – Anatoly D. Apr 11 '13 at 7:28
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    LMAX Disruptor is probably the most famous. – Martijn Verburg Apr 11 '13 at 8:10

Cassandra is extremely performant and open source. https://github.com/apache/cassandra

It's a pretty huge open source project that focuses on high writes, no single point failure and has a good feature set (including distributed, eventually consistent counters).

HBase is another extremely good distributed, noSQL BigData replica. https://github.com/apache/hbase

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