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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-15670) UserGroupInformation TGT renewer thread doesn't use monotonically increasing time for calculating interval to sleep
Date Thu, 16 Aug 2018 23:30:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Yang resolved HADOOP-15670.
--------------------------------
    Resolution: Not A Problem

> 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: 3.1.0, 2.9.1
>            Reporter: Hrishikesh Gadre
>            Assignee: Hrishikesh Gadre
>            Priority: Minor
>
> 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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