Hrishikesh Gadre created HADOOP-15670:
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Summary: UserGroupInformation TGT renewer thread doesn't use
monotonically increasing time for calculating interval to sleep
Key: HADOOP-15670
URL: https://issues.apache.org/jira/browse/HADOOP-15670
Project: Hadoop Common
Issue Type: Bug
Components: common
Affects Versions: 2.9.1, 3.1.0
Reporter: Hrishikesh Gadre
Assignee: Hrishikesh Gadre
As per the [documentation of Time#now()
method|https://github.com/apache/hadoop/blob/74411ce0ce7336c0f7bb5793939fdd64a5dcdef6/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Time.java#L49-L57],
it should not be used for calculating duration or interval to sleep. But the
TGT renewer thread in UserGroupInformation object doesn't follow this
recommendation,
[https://github.com/apache/hadoop/blob/74411ce0ce7336c0f7bb5793939fdd64a5dcdef6/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L892-L899]
This should be fixed to use Time.monotonicNow() API instead.
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