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https://issues.apache.org/jira/browse/CASSANDRA-15241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16896258#comment-16896258
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Jon Haddad commented on CASSANDRA-15241:
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Nice, thanks [~cnlwsu]. I'm going to get some performance numbers to test the
impact of querying this table while the database is under heavy load. I don't
expect we'll see a problem, I'd just like to have them handy for anyone that
checks this issue out in the future.
I'm happy to do a code review, or if someone else is interested we can split
the review, with me doing perf analysis and the other doing code review.
> Virtual table to expose current running queries
> -----------------------------------------------
>
> Key: CASSANDRA-15241
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15241
> Project: Cassandra
> Issue Type: New Feature
> Components: Feature/Virtual Tables
> Reporter: Chris Lohfink
> Assignee: Chris Lohfink
> Priority: Normal
>
> Expose current running queries and their duration.
> {code}cqlsh> select * from system_views.queries;
> thread_id | duration_micros | task
> ------------------------------+-----------------+---------------------------------------------------------------------------------
> Native-Transport-Requests-17 | 6325 | QUERY
> select * from system_views.queries; [pageSize = 100]
> Native-Transport-Requests-4 | 14681 | EXECUTE
> f4115f91190d4acf09e452637f1f2444 with 0 values at consistency LOCAL_ONE
> Native-Transport-Requests-6 | 14678 | EXECUTE
> f4115f91190d4acf09e452637f1f2444 with 0 values at consistency LOCAL_ONE
> ReadStage-10 | 16535 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-13 | 16535 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-14 | 16535 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-19 | 11861 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-20 | 11861 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-22 | 7279 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-23 | 4716 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-5 | 16535 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-7 | 16535 |
> SELECT * FROM basic.wide1 LIMIT 5000
> ReadStage-8 | 16535 |
> SELECT * FROM basic.wide1 LIMIT 5000{code}
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