Tracker framework is in place that supports pluggable tracker strategy. There...

Tracker framework is in place that supports pluggable tracker strategy. There are several bugs along with performance problems.

 - For larger data shuffle ShuffleServerThread gets "Broken Pipe" and ShuffleClient gets "Connection Reset"
 - There is a bug in the accounting counters of BalanceConnectionsShuffleTrackerStrategy. Some of them go below zero while decrementing which is not supposed to happen.