Xiao Chen commented on HADOOP-13854:

One example entry in the audit log is this intermittently:
2016-11-30 12:24:02,484 ERROR[user=impala] Method:'POST' Exception:'No content 
to map to Object due to end of input'

The exception message is hardly helpful.

> KMS should log error details even if a request is malformed
> -----------------------------------------------------------
>                 Key: HADOOP-13854
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13854
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: kms
>    Affects Versions: 2.6.5
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
> It appears if a KMS HTTP request is malformed, it could rejected by tomcat 
> and a response is sent by 
> [KMSExceptionsProvider|https://github.com/apache/hadoop/blob/branch-3.0.0-alpha1/hadoop-common-project/hadoop-kms/src/main/java/org/apache/hadoop/crypto/key/kms/server/KMSExceptionsProvider.java#L99]
>  overriding Jersey's ExceptionMapper.
> This behavior is okay, but in the logs we'll see an ERROR audit log, but 
> nothing in kms.log (or anywhere else). This makes trouble shooting pretty 
> painful, let's improve it.

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