[jira] [Updated] (DRILL-8307) Ensure thread safety in the Druid plugin HTTP client

["James Turton (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-8307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Turton updated DRILL-8307:
--------------------------------
    Summary: Ensure thread safety in the Druid plugin HTTP client  (was: Druid storage plugin's use of Apache HttpClient is not thread safe)

> Ensure thread safety in the Druid plugin HTTP client
> ----------------------------------------------------
>
>                 Key: DRILL-8307
>                 URL: https://issues.apache.org/jira/browse/DRILL-8307
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - Other
>    Affects Versions: 1.20.2
>            Reporter: James Turton
>            Priority: Major
>             Fix For: 1.20.3
>
>
> When multiple concurrent queries are run against a single Druid storage plugin then an error such as is shown below is reported by the Apache HttpClient used in that plugin. The Druid storage plugin uses a single static HttpClient instance which should be replaced with something like PoolingHttpClientConnectionManager or the OkHttp3 library for multithreaded access.
> {code:java}
> [1cdd2b75-1310-xxxx-xxxx-5a638567ed07:foreman] INFO
> o.a.d.e.s.d.s.DruidSchemaFactory
> User Error Occurred: Failure while loading druid datasources for database
> 'druid-egsmd300'. (Invalid use of BasicClientConnManager: connection still
> allocated.
> Make sure to release the connection before allocating another one.)
> org.apache.drill.common.exceptions.UserException: DATA_READ ERROR: Failure
> while loading druid datasources for database '<connection name>'.
> {code}



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