Rushabh S Shah created HADOOP-14265:
---------------------------------------

             Summary: AuthenticatedURL swallows the exception received from 
server.
                 Key: HADOOP-14265
                 URL: https://issues.apache.org/jira/browse/HADOOP-14265
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Rushabh S Shah
            Assignee: Rushabh S Shah


While debugging some issue with kms server, we found out that AuthenticatedURL 
swallows the original exception from server and constructed 
{{AuthenticationException}} with response code and response message.

Below is the stack trace which didn't help in figuring out why the 
getDelegationTokens call failed.
Due to lack of info logs on the kms server side also, this made the debugging 
even harder.
{noformat}
2017-03-23 16:32:10,364 ERROR [HiveServer2-Background-Pool: Thread-17795] [] 
exec.Task (TezTask.java:execute(197)) - Failed to execute tez graph.
java.io.IOException: java.lang.reflect.UndeclaredThrowableException
        at 
org.apache.hadoop.crypto.key.kms.KMSClientProvider.addDelegationTokens(KMSClientProvider.java:1042)
        at 
org.apache.hadoop.crypto.key.KeyProviderDelegationTokenExtension.addDelegationTokens(KeyProviderDelegationTokenExtension.java:110)
        at 
org.apache.hadoop.hdfs.DistributedFileSystem.addDelegationTokens(DistributedFileSystem.java:2444)
        at 
org.apache.tez.common.security.TokenCache.obtainTokensForFileSystemsInternal(TokenCache.java:107)
        at 
org.apache.tez.common.security.TokenCache.obtainTokensForFileSystemsInternal(TokenCache.java:86)
        at 
org.apache.tez.common.security.TokenCache.obtainTokensForFileSystems(TokenCache.java:76)
        at 
org.apache.tez.client.TezClientUtils.addLocalResources(TezClientUtils.java:301)
        at 
org.apache.tez.client.TezClientUtils.setupTezJarsLocalResources(TezClientUtils.java:180)
        at 
org.apache.tez.client.TezClient.getTezJarResources(TezClient.java:911)
   ...
Caused by: java.lang.reflect.UndeclaredThrowableException
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1954)
        at 
org.apache.hadoop.crypto.key.kms.KMSClientProvider.addDelegationTokens(KMSClientProvider.java:1023)
        ... 31 more
Caused by: 
org.apache.hadoop.security.authentication.client.AuthenticationException: 
Authentication failed, status: 403, message: Forbidden
        at 
org.apache.hadoop.security.authentication.client.AuthenticatedURL.extractToken(AuthenticatedURL.java:275)
        at 
org.apache.hadoop.security.authentication.client.PseudoAuthenticator.authenticate(PseudoAuthenticator.java:77)
        at 
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator.authenticate(DelegationTokenAuthenticator.java:132)
        at 
org.apache.hadoop.security.authentication.client.KerberosAuthenticator.authenticate(KerberosAuthenticator.java:214)
        at 
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator.authenticate(DelegationTokenAuthenticator.java:132)
        at 
org.apache.hadoop.security.authentication.client.AuthenticatedURL.openConnection(AuthenticatedURL.java:215)
        at 
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator.doDelegationTokenOperation(DelegationTokenAuthenticator.java:298)
        at 
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator.getDelegationToken(DelegationTokenAuthenticator.java:170)
        at 
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticatedURL.getDelegationToken(DelegationTokenAuthenticatedURL.java:377)
        at 
org.apache.hadoop.crypto.key.kms.KMSClientProvider$5.run(KMSClientProvider.java:1028)
        at 
org.apache.hadoop.crypto.key.kms.KMSClientProvider$5.run(KMSClientProvider.java:1023)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1936)
        ... 32 more
{noformat}

Following is the relevant chunk of code from branch-2.8 but the code in trunks 
hasn't changed much.
{code:title=AuthenticatedURL.java|borderStyle=solid}
  public static void extractToken(HttpURLConnection conn, Token token) throws 
IOException, AuthenticationException {
    int respCode = conn.getResponseCode();
    if (notExpectedResponseCode) {
    } else {
      token.set(null);
      throw new AuthenticationException("Authentication failed, status: " +     
      conn.getResponseCode() + ", message: " + conn.getResponseMessage());
    }
  }
{code}



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