vrozov commented on a change in pull request #784: Allow caller to construct 
HadoopInputFile and HadoopOutputFile using an existing instance of FileSystem 
object.
URL: https://github.com/apache/incubator-iceberg/pull/784#discussion_r378004624
 
 

 ##########
 File path: core/src/main/java/org/apache/iceberg/hadoop/HadoopInputFile.java
 ##########
 @@ -133,7 +143,7 @@ public SeekableInputStream newStream() {
   }
 
   public Configuration getConf() {
-    return conf;
+    return fs.getConf();
 
 Review comment:
   I don't see much difference between
   ```
   Configuration conf = new Configuration();
   Path path = new Path(...);
   HadoopInputFile file = HadoopInputFile.fromPath(path, conf);
   ...
   conf = new Configuration();
   file.setConf(conf);
   ```
   and
   ```
   Configuration conf = new Configuration();
   Path path = new Path(...);
   HadoopInputFile file = HadoopInputFile.fromPath(path, conf);
   ...
   conf.set();
   ```
   if I correctly understand your concern with incorrectly updating the 
configuration. It would be necessary to copy passed configuration object to 
prevent hijacking.

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