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    Type:Improvement 
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    Resolution: Done
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    Priority:Minor - P4 
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    Affects Version/s: None
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    Component/s: None
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It would help in debugging if mongod's log had info about which mongos asked for a split or a migrated. Specifically:
+ config.cpp:MoveTimingHelper
- record in logChange which mongos requested the move
+ chunk.cpp:multiSplit_inlock
- record in logChagne which mongos initiated the split
This would have save some time in, say, SERVER-1979