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https://issues.apache.org/jira/browse/HIVE-12987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15135580#comment-15135580
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Jimmy Xiang commented on HIVE-12987:
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Do you mean the user queries map? It is used to track active unique users. It
is a metrics emitted to JMX/file so that users can find out how many active
users are executing queries at a given time. This map is needed to not count
the same user many times if s/he are running several queries at the same time.
> 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-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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