Proposal to support disk based spooling
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                 Key: FLUME-1045
                 URL: https://issues.apache.org/jira/browse/FLUME-1045
             Project: Flume
          Issue Type: New Feature
    Affects Versions: v1.0.0
            Reporter: Inder SIngh
            Priority: Minor


1. Problem Description 
A sink being unavailable at any stage in the pipeline causes it to back-off and 
retry after a while. Channel's associated with such sinks start buffering data 
with the caveat that if you are using a memory channel it can result in a 
domino effect on the entire pipeline. There could be legitimate down times eg: 
HDFS sink being down for name node maintenance, hadoop upgrades. 

2. Why not use a durable channel (JDBC, FileChannel)?
Want high throughput and support sink down times as a first class use-case.



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