[GitHub] lucene-solr pull request: SOLR-8785: Use Metrics library for core ...

[randomstatistic <gi...@git.apache.org>]

GitHub user randomstatistic opened a pull request:

    https://github.com/apache/lucene-solr/pull/25

    SOLR-8785: Use Metrics library for core metrics

    There were three main areas that used the copied classes in org.apache.solr.util.stats:
      - AnalyticsStatisticsCollector
      - Overseer.Stats
      - RequestHandlerBase
    
    This patch adds depreciation tags to all the copied classes, and also replaces all usage of those classes with classes from the Metrics library.
    I added one new class (org.apache.solr.util.stats.Metrics) to provide some common access patterns for metrics gathering.
    
    This patch only adds Registry-based tracking to RequestHandlerBase, although all three areas are a fit for it. The effect is that all one needs to do is add a Reporter to the SharedMetricRegistry named “solr.registry.requesthandler” and all named request handler stats will be exported automatically.
    
    Compatibility notes:
      - The “totalTime” stat has been deleted from all three areas. This never seemed very useful, and Metrics didn’t support it in the Timer class, so it would have required some extra code to keep.
      - RequestHandler stats are now persistent, and will no longer reset on reload.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/randomstatistic/lucene-solr metrics_lib

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/lucene-solr/pull/25.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #25
    
----
commit 77ba4704399ecd5121a6941a3a75c1294172ed21
Author: Jeff Wartes <je...@lanndark.com>
Date:   2016-03-16T18:27:35Z

    SOLR-8785 - Upgrade Metrics lib

commit 9ad3a8179ac446f5820e051802a37bf8b2ba911b
Author: Jeff Wartes <je...@lanndark.com>
Date:   2016-03-18T02:46:49Z

    SOLR-8785 - Use the Metrics lib instead of the old classes from the org.apache.solr.util.stats package space.

commit 6ee11c807aa7432ec02f9ad63aefc7487a02566a
Author: Jeff Wartes <je...@lanndark.com>
Date:   2016-03-18T02:55:33Z

    SOLR-8785 - Use persistent, reportable timers for named request handlers

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