COMMIT_PENDING should be returned if a writer has written data, but this data may ultimately disappear.
Uses a fixed size cache to check for and filter out duplicate chunks.
Minimal writer; does nothing with data.
A pipeline of Pipelineable writers Controlled by option 'chukwaCollector.pipeline', which should be a comma- separated list of classnames.
This class is thread-safe -- rotate() and save() both synchronize on this object.
Effectively a "Tee" in the writer pipeline.
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