Critical Description
Currently exchange futures share same queue for pending(incomplete) and completed exchanges.
The queue has fixed hardcoded size of 1000.
This leads to a problem when > 1000 nodes try to enter grid.
In such case oldest exchanges will be removed by ExchangeFutureSet size limit, leading to whole exchange hanging.
Solution:
1. Use separate queues for pending and completed exchanges.
2. Pending exchange queue must be unbounded.
3. Add system property to control exchange history.
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