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https://issues.apache.org/jira/browse/DRILL-6693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16589569#comment-16589569
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Vlad Rozov commented on DRILL-6693:
-----------------------------------

The calculation of max threads in the Jetty thread pool is incorrect as it only 
accounts for one handler threads. PR changes the default number of max handlers 
to 5. It can be changed in the config if necessary.

> 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
>            Reporter: Anton Gozhiy
>            Assignee: Vlad Rozov
>            Priority: Major
>             Fix For: 1.15.0
>
>         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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