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Posted to commits@cassandra.apache.org by "Chris Lohfink (JIRA)" <ji...@apache.org> on 2019/07/21 18:52:00 UTC
[jira] [Commented] (CASSANDRA-15241) Virtual table to expose
current running queries
[ https://issues.apache.org/jira/browse/CASSANDRA-15241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16889800#comment-16889800 ]
Chris Lohfink commented on CASSANDRA-15241:
-------------------------------------------
Pull request to iterate over the current SEPWorkers, and find any Runnable's that are currently running in it that implement a new DebuggableTask interface. Those Runnables can now expose the start time and a debug string. The NTR and ReadStage localRunnable already have start time in nanos so this is just exposing information already there without adding overhead to read/write path.
https://github.com/apache/cassandra/pull/333
> 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
> 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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