Arshad Matin created LENS-777:
---------------------------------
Summary: 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
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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