[jira] [Reopened] (SOLR-6275) Improve accuracy of QTime reporting

["Ramkumar Aiyengar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-6275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ramkumar Aiyengar reopened SOLR-6275:
-------------------------------------

Reopening this to resolve some Jenkins failures with the MacOSX..

[~thetaphi] pointed me to http://mail.openjdk.java.net/pipermail/hotspot-dev/2013-May/009496.html which talks about MacOSX using wall time instead (gettimeofday) -- which would certainly fail this test (and is in some sense validation of why this issue exists! :) )

We have two approaches here..

 - Disable the test for {{nanoTime}} altogether
 - Disable it just for MacOSX

I haven't included reverting the change as it doesn't make things any better, the test failure is on a platform which is a no-op as far as this change is concerned anyway, and there haven't been other failures..


> Improve accuracy of QTime reporting
> -----------------------------------
>
>                 Key: SOLR-6275
>                 URL: https://issues.apache.org/jira/browse/SOLR-6275
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>            Reporter: Ramkumar Aiyengar
>            Assignee: Ramkumar Aiyengar
>            Priority: Minor
>             Fix For: 5.1
>
>         Attachments: SOLR-6275.patch
>
>
> Currently, {{QTime}} uses {{currentTimeMillis}} instead of {{nano Time}} and hence is not suitable for time measurements. Further, it is really started after all the dispatch logic in {{SolrDispatchFilter}} (same with the top level timing reported by {{debug=timing}}) which may or may not be expensive, and hence may not fully represent the time taken by the search. This is to remedy both cases.



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