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https://issues.apache.org/jira/browse/DRILL-8307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17605352#comment-17605352
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Charles Givre commented on DRILL-8307:
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[~dzamo] I don't know if you're planning on taking this one, but I had two
thoughts here:
# Would it be worth looking to see where else in Drill we use the Apache
httpclient and switch them all over to OkHttp?
# I started a branch ([https://github.com/cgivre/drill/tree/druid_evf)] which
converts the Druid plugin to EVF. It was almost done. The remaining parts to
finish were all in the ScanBatchCreator. Would you want to incorporate this
work as well?
> Druid storage plugin's use of Apache HttpClient is not thread safe
> ------------------------------------------------------------------
>
> 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 for multithreaded access.
> [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>'.
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