[jira] [Created] (HADOOP-19833) fs.s3a.classloader.isolation=false configuration does not work - classloader not retrieved from Configuration object

["Yunzhao Yang (Jira)" <ji...@apache.org>]

Yunzhao Yang created HADOOP-19833:
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             Summary: fs.s3a.classloader.isolation=false configuration does not work - classloader not retrieved from Configuration object
                 Key: HADOOP-19833
                 URL: https://issues.apache.org/jira/browse/HADOOP-19833
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 3.4.3, 3.4.2, 3.4.1, 3.4.0, 3.5.0, 3.4.4, 3.5.1
            Reporter: Yunzhao Yang
             Fix For: 3.5.0, 3.4.4, 3.5.1, 3.4.3, 3.4.2, 3.4.1, 3.4.0


The configuration {{fs.s3a.classloader.isolation=false (introduced from https://issues.apache.org/jira/browse/HADOOP-18993)}} does not work as intended. While the configuration is correctly set in the Hadoop Configuration object, the S3A classloader is never retrieved from the Hadoop Configuration object, resulting in classloader isolation always being enabled regardless of the {{fs.s3a.classloader.isolation}} value.

 

The bug occurs in two steps:
 # *Configuration is set correctly* - The isolation flag is properly stored in the Hadoop Configuration object

 ** Code: [https://github.com/apache/hadoop/blob/release-3.5.0-RC0/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AUtils.java#L1756] 
 # *Classloader is not retrieved from Configuration* - When creating instances, the classloader is not read from the Configuration object

 ** Code: [https://github.com/apache/hadoop/blob/release-3.5.0-RC0/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AUtils.java#L660] 



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