Tim Armstrong created IMPALA-6519:

             Summary: Allow atomic allocation of an unreserved buffer
                 Key: IMPALA-6519
                 URL: https://issues.apache.org/jira/browse/IMPALA-6519
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong

[~kwho] needs this for his KRPC work. We want the exchange node to allocate 
buffer pool buffers to store incoming data. However, the current interface 
doesn't easily allow multiple threads to allocate buffers for which they don't 
have reservations. Generally allocating buffers without having a reservation 
would be an anti-pattern but it is a useful transitional mechanism until we can 
reserve memory for the exchange node.

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