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From "Keith Turner (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-4788) Improve Thrift Transport pool
Date Thu, 15 Feb 2018 16:09:00 GMT


Keith Turner commented on ACCUMULO-4788:

In PR #385 the global lock was not addressed.  The only change it made was to make the operations
done when the lock was held much faster.

> Improve Thrift Transport pool
> -----------------------------
>                 Key: ACCUMULO-4788
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 2.0.0
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
> 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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