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Posted to issues@lucene.apache.org by "Andrzej Bialecki (Jira)" <ji...@apache.org> on 2020/11/10 10:50:00 UTC
[jira] [Resolved] (SOLR-14683) Review the metrics API to ensure
consistent placeholders for missing values
[ https://issues.apache.org/jira/browse/SOLR-14683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrzej Bialecki resolved SOLR-14683.
-------------------------------------
Resolution: Fixed
> Review the metrics API to ensure consistent placeholders for missing values
> ---------------------------------------------------------------------------
>
> Key: SOLR-14683
> URL: https://issues.apache.org/jira/browse/SOLR-14683
> Project: Solr
> Issue Type: Improvement
> Components: metrics
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: master (9.0)
>
> Attachments: SOLR-14683.patch, SOLR-14683.patch
>
>
> Spin-off from SOLR-14657. Some gauges can legitimately be missing or in an unknown state at some points in time, eg. during SolrCore startup or shutdown.
> Currently the API returns placeholders with either impossible values for numeric gauges (such as index size -1) or empty maps / strings for other non-numeric gauges.
> [~hossman] noticed that the values for these placeholders may be misleading, depending on how the user treats them - if the client has no special logic to treat them as "missing values" it may erroneously treat them as valid data. E.g. numeric values of -1 or 0 may severely skew averages and produce misleading peaks / valleys in metrics histories.
> On the other hand returning a literal {{null}} value instead of the expected number may also cause unexpected client issues - although in this case it's clearer that there's actually no data available, so long-term this may be a better strategy than returning impossible values, even if it means that the client should learn to handle {{null}} values appropriately.
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