Allow merging of Credentials
----------------------------
Key: HADOOP-8048
URL: https://issues.apache.org/jira/browse/HADOOP-8048
Project: Hadoop Common
Issue Type: Improvement
Components: util
Affects Versions: 0.24.0, 0.23.1
Reporter: Daryn Sharp
Assignee: Daryn Sharp
There is an existing {{Credentials#addAll}} which combines two {{Credentials}},
but it overwrites all existing {{Credentials}}. There should be a
{{Credentials#mergeAll}} that will not overwrite. This will facility the
cleanup of code in {{TokenCache}} denoted with:
{code}
//TODO: Need to come up with a better place to put
//this block of code to do with reading the file
{code}
The token cache basically needs to merge the contents of a binary credentials
file when it fails to find a token. Performing the merge within
{{Credentials}} is cleaner, and will break the cross-component dependency
whereby the {{TokenCache}} currently has to have intimate knowledge of how the
{{FileSystem}} will key tokens in the cache.
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