unnecessary hftp token fetch and renewal thread
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Key: HDFS-2589
URL: https://issues.apache.org/jira/browse/HDFS-2589
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Affects Versions: 0.20.205.1
Reporter: Daryn Sharp
Assignee: Daryn Sharp
Instantiation of the hftp filesystem is causing a token to be implicitly
created and added to a custom token renewal thread. With the new token renewal
feature in the JT, this causes the mapreduce {{obtainTokensForNamenodes}} to
fetch two tokens (an implicit and uncancelled token, and an explicit token) and
leave a spurious renewal thread running. This thread should not be running in
the JT.
After speaking with Owen, the quick solution is to lazy fetch the token, and to
lazy start the renewer thread.
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