saxenapranav opened a new pull request, #6511:
URL: https://github.com/apache/hadoop/pull/6511

   Backport of 
https://github.com/apache/hadoop/commit/7dc166ddc7fa524d842c77c0d6e83dde6d13dc54
   Trunk PR: https://github.com/apache/hadoop/pull/6022
   
   Description:
   
   Address JDK bug JDK-8314978 related to handling of HTTP 100 responses.
   
   https://bugs.openjdk.org/browse/JDK-8314978
   
   In the AbfsHttpOperation, after sendRequest() we call processResponse() 
method from AbfsRestOperation.
   Even if the conn.getOutputStream() fails due to expect-100 error, we consume 
the exception and let the code go ahead. This may call getHeaderField() / 
getHeaderFields() / getHeaderFieldLong() after getOutputStream() has failed. 
These invocation all lead to server calls.
   
   This commit aims to prevent this.
   If connection.getOutputStream() fails due to an Expect-100 error, the ABFS 
client does not invoke getHeaderField(), getHeaderFields(), 
getHeaderFieldLong() or getInputStream().
   
   getResponseCode() is safe as on the failure it sets the responseCode 
variable in HttpUrlConnection object.


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