Daniel Templeton created HADOOP-12732:
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Summary: Filesystem.addDelegationToken() should automatically
replace _HOST
Key: HADOOP-12732
URL: https://issues.apache.org/jira/browse/HADOOP-12732
Project: Hadoop Common
Issue Type: Improvement
Components: fs
Affects Versions: 2.7.1
Reporter: Daniel Templeton
Assignee: Daniel Templeton
Priority: Critical
It is currently the client's responsibility to call
{{SecurityUtil.getServerPrincipal()}} to replace the _HOST placeholder in any
principal name used for a delegation token. This is a non-optional operation
and should not be pushed onto the client. As the
{{SecurityUtil.getServerPrincipal()}} call is already designed to be both
highly efficient and idempotent, I see no reason not to move the call into the
{{FileSystem.addDelegationToken()}} call.
As additional incentive, all client apps that followed the distributed shell as
the canonical example failed to do the replacement because distributed shell
fails to do the replacement. (See YARN-4629.) Rather than fixing the whole
world, let's move the operation into the API where it belongs.
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