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https://issues.apache.org/jira/browse/LUCENE-8884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16907422#comment-16907422
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Robert Muir commented on LUCENE-8884:
-------------------------------------
are threadlocals really needed? must you call get on every op vs once in the
ctor? after all thats why we have clone? ( should not have thread issues ).
readint has a second spurious call.
> Add Directory wrapper to track per-query IO counters
> ----------------------------------------------------
>
> Key: LUCENE-8884
> URL: https://issues.apache.org/jira/browse/LUCENE-8884
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-8884.patch
>
>
> Lucene's IO abstractions ({{Directory, IndexInput/Output}}) make it really
> easy to track counters of how many IOPs and net bytes are read for each
> query, which is a useful metric to track/aggregate/alarm on in production or
> dev benchmarks.
> At my day job we use these wrappers in our nightly benchmarks to catch any
> accidental performance regressions.
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