[jira] [Created] (SPARK-23859) Initial PR for Instrumentation improvements: UUID and logging levels

["Joseph K. Bradley (JIRA)" <ji...@apache.org>]

Joseph K. Bradley created SPARK-23859:
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             Summary: Initial PR for Instrumentation improvements: UUID and logging levels
                 Key: SPARK-23859
                 URL: https://issues.apache.org/jira/browse/SPARK-23859
             Project: Spark
          Issue Type: Sub-task
          Components: ML
    Affects Versions: 2.3.0
            Reporter: Joseph K. Bradley
            Assignee: Weichen Xu


This is a subtask for an initial PR to improve MLlib's Instrumentation class for logging.  It will address a couple of issues and use the changes in LogisticRegression as an example class.

Issues:
* The UUID is currently generated from an atomic integer.  This is a problem since the integer is reset whenever a persisted Estimator is loaded on a new cluster.  We should just use a random UUID to get a new UUID each time with high probability.
* We use both Instrumentation and Logging to log stuff.  Let's standardize around Instrumentation in MLlib since it can associate logs with the Estimator or Transformer which produced the logs (via a prefix with the algorithm's name or UUID).



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