James Turton created DRILL-8307:
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Summary: 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
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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