[jira] [Created] (ARROW-2568) [Python] Expose thread pool size setting to Python, and deprecate "nthreads"

["Antoine Pitrou (JIRA)" <ji...@apache.org>]

Antoine Pitrou created ARROW-2568:
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             Summary: [Python] Expose thread pool size setting to Python, and deprecate "nthreads"
                 Key: ARROW-2568
                 URL: https://issues.apache.org/jira/browse/ARROW-2568
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 0.9.0
            Reporter: Antoine Pitrou


Now that we have a global thread pool, we should:
 * use it in places where we currently require an explicit number of threads (with an additional {{use_threads}} argument to enable parallelism)
 * deprecate the now pointless {{nthreads}} argument
 * expose the thread pool capacity setting in Python



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