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https://issues.apache.org/jira/browse/SOLR-9854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17281682#comment-17281682
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Andrzej Bialecki commented on SOLR-9854:
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Metrics Counter can only go forward but these integers must be able to go both
ways because they represent the number of *currently* running merges (and the
current number of docs / segments involved in the running merges), which
naturally may vary from 0 to N.
> Collect metrics for index merges and index store IO
> ---------------------------------------------------
>
> Key: SOLR-9854
> URL: https://issues.apache.org/jira/browse/SOLR-9854
> Project: Solr
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 6.4, 7.0
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Minor
> Fix For: 6.4, 7.0
>
> Attachments: SOLR-9854.patch, SOLR-9854.patch
>
>
> Using API for metrics management developed in SOLR-4735 we should also start
> collecting metrics for major aspects of {{IndexWriter}} operation, such as
> read / write IO rates, number of minor and major merges and IO during these
> operations, etc.
> This will provide a better insight into resource consumption and load at the
> IO level.
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