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https://issues.apache.org/jira/browse/LENS-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14904357#comment-14904357
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Hadoop QA commented on LENS-777:
--------------------------------
Applied patch:
[LENS-777.02.patch|https://issues.apache.org/jira/secure/attachment/12761868/LENS-777.02.patch]
and ran command: mvn clean install. Result: Success. Build Job:
https://builds.apache.org/job/PreCommit-Lens-Build/78/
> Query remains in queue even when driver is free
> ------------------------------------------------
>
> Key: LENS-777
> URL: https://issues.apache.org/jira/browse/LENS-777
> Project: Apache Lens
> Issue Type: Bug
> Reporter: Arshad Matin
> Assignee: Akshay Goyal
> Attachments: LENS-777.01.patch, LENS-777.02.patch
>
>
> Scenario:
> Config
> {noformat}
> <property>
> <name>driver.max.concurrent.launched.queries</name>
> <value>1</value>
> <description>Maximum queries which can be launched simultaneously on this
> driver. This should be equal to
> lens.driver.jdbc.pool.max.size. This configuration value is only useful
> when MaxConcurrentDriverQueriesConstraint
> is enabled by using
> org.apache.lens.server.api.query.constraint.MaxConcurrentDriverQueriesConstraintFactory
> as
> one of the factories in lens.driver.jdbc.query.constraint.factories
> property.</description>
> </property>
> <property>
> <name>lens.driver.jdbc.pool.max.size</name>
> <value>1</value>
> <description>Maximum number of concurrent connections allowed in
> pool</description>
> </property>
> {noformat}
> Launched 1st query with user U1
> Launched 2nd query with user U2
> Launched 3rd query with user U1
> Launched 4th query with user U2
> Query Status
> ==========
> Q1 -> Running
> Q2 -> Queued(queue number = 1)
> Q3 -> Queued(queue number = 2)
> Q4 -> Queued(queue number = 3)
> When Q1 completes, Query Status
> ==========================
> Q1 -> Successful
> Q2 -> Queued(queue number = 1)
> Q3 -> Running
> Q4 -> Queued(queue number = 2)
> When Q2 completes, Query Status
> ==========================
> Q1 -> Successful
> Q2 -> Queued(queue number = 1)
> Q3 -> Successful
> Q4 -> Queued(queue number = 2)
> user "U2" query will never get picked. Another query launched by user "U1"
> will be answered.
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