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https://issues.apache.org/jira/browse/DRILL-6693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16588627#comment-16588627
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Anton Gozhiy commented on DRILL-6693:
-------------------------------------
[~vrozov], Yes, I set the number of acceptors and selectors to 5, and the
number of threads was changed respectively:
{noformat}
[mapr@node1 drill]$ jstack 23100|grep -i selector.run
at
org.eclipse.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:485)
at
org.eclipse.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:485)
at
org.eclipse.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:485)
at
org.eclipse.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:485)
at
org.eclipse.jetty.io.SelectorManager$ManagedSelector.run(SelectorManager.java:485)
[mapr@node1 drill]$ jstack 23100|grep -i acceptor.run
at
org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:467)
at
org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:467)
at
org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:467)
at
org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:467)
at
org.eclipse.jetty.server.AbstractConnector$Acceptor.run(AbstractConnector.java:467)
{noformat}
Also, I noticed that when a query is running being started from Web UI, all
acceptors threads except one are in BLOCKED state. I'll attach the whole jstack
to the JIRA ticket.
> When a query is started from Drill Web Console, the UI becomes inaccessible
> until the query is completed
> --------------------------------------------------------------------------------------------------------
>
> Key: DRILL-6693
> URL: https://issues.apache.org/jira/browse/DRILL-6693
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.13.0, 1.14.0, 1.15.0
> Reporter: Anton Gozhiy
> Priority: Major
> Attachments: jstack.txt
>
>
> *Steps:*
> # From Web UI, run the following query:
> {noformat}
> select *
> from (
> select employee_id, full_name, first_name, last_name, position_id,
> position_title, store_id, department_id, birth_date, hire_date, salary,
> supervisor_id, education_level, marital_status, gender, management_role
> from cp.`employee.json`
> union
> select employee_id, full_name, first_name, last_name, position_id,
> position_title, store_id, department_id, birth_date, hire_date, salary,
> supervisor_id, education_level, marital_status, gender, management_role
> from cp.`employee.json`
> union
> select employee_id, full_name, first_name, last_name, position_id,
> position_title, store_id, department_id, birth_date, hire_date, salary,
> supervisor_id, education_level, marital_status, gender, management_role
> from cp.`employee.json`)
> where last_name = 'Blumberg'
> {noformat}
> # While query is running, try open the Profiles page (or any other). If It
> completes too fast, add some unions to the query above.
> *Expected result:*
> Profiles page should be opened. The running query should be listed.
> *Actual result:*
> The Web UI hangs until the query completes.
> *Notes:*
> - If you open another tab with Web Console, it also stuck when the query is
> running.
> - If the query is started from sqlline, everything is fine.
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