Oscar Guadilla created HDFS-11189:
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             Summary: WebHDFS and FollowRedirects
                 Key: HDFS-11189
                 URL: https://issues.apache.org/jira/browse/HDFS-11189
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: webhdfs
    Affects Versions: 2.7.3
         Environment: We are using webhdfs from a j2ee environment with java 6. 
In the web application we have a lot of libraries: spring, jersey, jackson...
            Reporter: Oscar Guadilla



In some cases with simple operations (get file - non two step operation) we 
detect that FollowRedirects flag of http comes as "false" and it makes webhdfs 
crash.

We don't really know which library change this behavior and it is really 
strange because the change is done directly in the jvm because in other 
wars/ears of the same j2ee server it fails also. If we restart the j2ee server 
it starts working again.

To fix the problem we changed the WebHdfsFileSystem class adding 
"setInstanceFollowRedirects(true)" in the connection management instead of 
supposing that it should be true and it works fine.

The same problem arises both in 1.x and 2.x webhdfs. We didn't test in 3.x

Could you fix it? We did it in our environment but it would fine in it could be 
included in the next releases.

Thanks in advance,
Oscar



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