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https://issues.apache.org/jira/browse/SOLR-14691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17181418#comment-17181418
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Adrien Grand commented on SOLR-14691:
-------------------------------------
[~ab] GC efficiency is important but I wonder if this really needs to be a
blocker?
> Metrics reporting should avoid creating objects
> -----------------------------------------------
>
> Key: SOLR-14691
> URL: https://issues.apache.org/jira/browse/SOLR-14691
> Project: Solr
> Issue Type: Improvement
> Components: metrics
> Reporter: Andrzej Bialecki
> Priority: Blocker
> Fix For: 8.7
>
>
> {{MetricUtils}} unnecessarily creates a lot of short-lived objects (maps and
> lists). This affects GC, especially since metrics are frequently polled by
> clients. We should refactor it to use {{MapWriter}} as much as possible.
> Alternatively we could provide our wrappers or subclasses of Codahale metrics
> that implement {{MapWriter}}, then a lot of complexity in {{MetricUtils}}
> wouldn't be needed at all.
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