Scribe, Flume and Chukwa - what are alternatives? [closed]

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I would like to learn about alternatives to those projects, especially designed to aggregate data from logs from multiple nodes (>500) and designed for low memory/cpu usage.

I'm familiar with scribe, flume and chukwa and I think that they use too much resources (JRE, many libraries).

All comments and recommendations about aggregating data from multiple nodes in low-usage manner are welcome.