Review Request: FLUME-2002: Flume RPC Client creates 2 threads per each log attempt if the remote flume agent goes down

[Mike Percy]

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https://reviews.apache.org/r/10880/
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Review request for Flume.


Description
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Shut down thread pools on failure to connect.


This addresses bug FLUME-2002.
    https://issues.apache.org/jira/browse/FLUME-2002


Diffs
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  flume-ng-sdk/src/main/java/org/apache/flume/api/NettyAvroRpcClient.java 
8285129 
  flume-ng-sdk/src/test/java/org/apache/flume/api/TestNettyAvroRpcClient.java 
1e6d2b2 

Diff: https://reviews.apache.org/r/10880/diff/


Testing
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Added unit test.


Thanks,

Mike Percy