ASF GitHub Bot updated ACCUMULO-4788:
    Labels: pull-request-available  (was: )

> Improve Thrift Transport pool
> -----------------------------
>                 Key: ACCUMULO-4788
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4788
>             Project: Accumulo
>          Issue Type: Improvement
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>            Priority: Major
>              Labels: pull-request-available
>             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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