[jira] [Commented] (SOLR-6752) Buffer Cache allocate/lost should be exposed through JMX

["Mark Miller (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-6752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14218010#comment-14218010 ] 

Mark Miller commented on SOLR-6752:
-----------------------------------

bq. 	SolrSOLR-6752 Buffer Cache allocate/lost should be exposed through JMX

I'm a little confused by the title - isn't this simply exposing hdfds block cache metrics via JMX? Why anything specific about allocate/lost? I see all sorts of stats in the getStatistics call.

We also probably want to try and align some of the stat key names with other cache objects in Solr: the query cache, filter cache, etc.

Also, I don't believe these will get registered with the jmx server. I think only the top level class for a plugin is by default - eg the HdfsDirectoryFactory itself.

> Buffer Cache allocate/lost should be exposed through JMX
> --------------------------------------------------------
>
>                 Key: SOLR-6752
>                 URL: https://issues.apache.org/jira/browse/SOLR-6752
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Mike Drob
>            Assignee: Mark Miller
>              Labels: metrics
>         Attachments: SOLR-6752.patch
>
>
> Currently, {{o.a.s.store.blockcache.Metrics}} has fields for tracking buffer allocations and losses, but they are never updated nor exposed to a receiving metrics system. We should do both. 



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