zachjsh opened a new issue #11393:
URL: https://github.com/apache/druid/issues/11393


   An extension loading issue was found when using commons-io version 2.9.0. In 
particular When the an extension directory is configured as a symlink, the 
symlink is not walked properly, and no jars are found, resulting in the 
extension not being loaded properly. An example of such a configuration for the 
druid-hdfs-storage  extension is shown below:
   
   `
   % pwd
   /Users/user1/apache-druid-0.22.0-SNAPSHOT/extensions
   %
   % ls -al
   total 0
   drwxr-xr-x  29 user1 staff   928 Jun 29 12:38 .
   drwxr-xr-x  12 user1  staff   384 Jun 29 12:35 ..
   drwxr-xr-x  28 user1  staff   896 Jun 29 12:35 druid-avro-extensions
   drwxr-xr-x  13 user1  staff   416 Jun 29 12:35 druid-aws-rds-extensions
   drwxr-xr-x  10 user1  staff   320 Jun 29 12:35 druid-azure-extensions
   drwxr-xr-x   3 user1  staff    96 Jun 29 12:35 druid-basic-security
   drwxr-xr-x   5 user1  staff   160 Jun 29 12:35 druid-bloom-filter
   drwxr-xr-x   4 user1  staff   128 Jun 29 12:35 druid-datasketches
   drwxr-xr-x   3 user1 staff    96 Jun 29 12:35 druid-ec2-extensions
   drwxr-xr-x   4 user1 staff   128 Jun 29 12:35 druid-google-extensions
   lrwxr-xr-x   1 user1 staff    49 Jun 29 12:38 druid-hdfs-storage -> 
/Users/user1/druid-hdfs-storage
   drwxr-xr-x   3 user1  staff    96 Jun 29 12:35 druid-histogram
   drwxr-xr-x  10 user1  staff   320 Jun 29 12:35 
druid-kafka-extraction-namespace
   drwxr-xr-x   7 user1  staff   224 Jun 29 12:35 druid-kafka-indexing-service
   drwxr-xr-x  11 user1  staff   352 Jun 29 12:35 druid-kerberos
   drwxr-xr-x   6 user1  staff   192 Jun 29 12:35 druid-kinesis-indexing-service
   drwxr-xr-x  38 user1  staff  1216 Jun 29 12:35 druid-kubernetes-extensions
   drwxr-xr-x   5 user1  staff   160 Jun 29 12:35 druid-lookups-cached-global
   drwxr-xr-x   7 user1  staff   224 Jun 29 12:35 druid-lookups-cached-single
   drwxr-xr-x  20 user1  staff   640 Jun 29 12:35 druid-orc-extensions
   drwxr-xr-x  15 user1  staff   480 Jun 29 12:35 druid-pac4j
   drwxr-xr-x  24 user1  staff   768 Jun 29 12:35 druid-parquet-extensions
   drwxr-xr-x   3 user1  staff    96 Jun 29 12:35 druid-protobuf-extensions
   drwxr-xr-x  73 user1  staff  2336 Jun 29 12:35 druid-ranger-security
   drwxr-xr-x  13 user1  staff   416 Jun 29 12:35 druid-s3-extensions
   drwxr-xr-x   4 user1  staff   128 Jun 29 12:35 druid-stats
   drwxr-xr-x   3 user1  staff    96 Jun 29 12:35 mysql-metadata-storage
   drwxr-xr-x   4 user1  staff   128 Jun 29 12:35 postgresql-metadata-storage
   drwxr-xr-x   3 user1  staff    96 Jun 29 12:35 simple-client-sslcontext
   %`
   
   An issue was filed with the apache commons-io team 
https://issues.apache.org/jira/browse/IO-741.
   
   We should add an integration test which tests this scenario so that we can 
bump the version of this dependency in the future with confidence.


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