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https://issues.apache.org/jira/browse/LENS-356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339902#comment-14339902
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Himanshu Gahlaut commented on LENS-356:
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This depends on the scale which lens is using to normalize the cost across
drivers. I guess the current scale is [0,1,infinite], so if we get 0 from any
driver instances, we know that it is the lowest. If we change the scale in
future, that scale will also have a lower bound which can be used.
> Run estimate for each driver in parallel
> -----------------------------------------
>
> Key: LENS-356
> URL: https://issues.apache.org/jira/browse/LENS-356
> Project: Apache Lens
> Issue Type: Sub-task
> Components: server
> Reporter: Amareshwari Sriramadasu
> Assignee: Amareshwari Sriramadasu
> Fix For: 2.1
>
>
> We are estimating the cost of query on each driver sequentially. Since each
> estimate is independent those can be parallelized.
> For each driver rewrite the query, call driver.estimate - need to parallelize
> this for all drivers.
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