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https://issues.apache.org/jira/browse/HIVE-12987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15136130#comment-15136130
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Jimmy Xiang commented on HIVE-12987:
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[~aihuaxu], the map is not redundant. It is different from that in
CodahaleMetrics. The entries in the map in CodahaleMetrics are all metrics. The
user in the introduced map is not metrics. Only the count is emitted as metrics.
> Add metrics for HS2 active users and SQL operations
> ---------------------------------------------------
>
> Key: HIVE-12987
> URL: https://issues.apache.org/jira/browse/HIVE-12987
> Project: Hive
> Issue Type: Task
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Attachments: HIVE-12987.1.patch, HIVE-12987.2.patch,
> HIVE-12987.2.patch, HIVE-12987.3.patch, HIVE-12987.3.patch
>
>
> HIVE-12271 added metrics for all HS2 operations. Sometimes, users are also
> interested in metrics just for SQL operations.
> It is useful to track active user count as well.
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