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https://issues.apache.org/jira/browse/LENS-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14723246#comment-14723246
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Akshay Goyal commented on LENS-753:
-----------------------------------
Updated the summary of the ticket to "Queue number for queries" as we agreed to
expose current queue number for queries present in the system. Queue number may
increase for a query when a new and higher priority query is fired.
> Queue number for queries
> ------------------------
>
> Key: LENS-753
> URL: https://issues.apache.org/jira/browse/LENS-753
> Project: Apache Lens
> Issue Type: Improvement
> Reporter: Akshay Goyal
> Assignee: Akshay Goyal
> Fix For: 2.4
>
> Attachments: LENS-753.02.patch
>
>
> This is to add queue number for queries after they were launched, in order to
> give users an idea of the sequence in which their queries were launched. Or
> in other words, to give them an idea of how many queries were launched before
> them which are still competing for resources with their query.
> Giving queue numbers from waiting query collection may not be correct as they
> are not consistent. When a candidate query is picked up from waiting state,
> it is removed from the collection and checked for cost constraints. If it
> fails the constraints, the query is added back to the waiting query
> collection. This causes inconsistency in terms of indices of queries within
> the collection. Because of this inconsistency, user might see their queue
> number increasing.
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