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From "Keith Turner (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-4788) Improve Thrift Transport pool
Date Fri, 26 Jan 2018 20:44:00 GMT
Keith Turner created ACCUMULO-4788:

             Summary: Improve Thrift Transport pool
                 Key: ACCUMULO-4788
             Project: Accumulo
          Issue Type: Improvement
            Reporter: Keith Turner
             Fix For: 2.0.0

Accumulo has a pool of recently opened connections to tablet servers.  When connecting to
tablet servers, this pool is checked first. The pool is built around a map of list.  There
are two problems with this pool :
 * It has global lock around the map of list
 * When trying to find a connection it does a linear search for a non reserved connection
(this is per tablet server)

Could possibly move to a model of having a list of unreserved connections and a set of reserved
connections per tablet server. Then to get a connection, could remove from the unreserved
list and add to the reserved set.  This would be a constant time operation.

For the locking, could move to a model of using a concurrent map and locking per tserver instead
of locking the entire map.


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