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https://issues.apache.org/jira/browse/DRILL-8307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Turton updated DRILL-8307:
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Description:
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.
[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>'.
was:
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>'.
> 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 or the OkHttp3 library 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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