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https://issues.apache.org/jira/browse/HADOOP-13238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981291#comment-15981291
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Allen Wittenauer commented on HADOOP-13238:
-------------------------------------------
Even if the tests do the same thing, we should strive for having at least one
test per function. This is particularly important for vendors who replace
functions. It means that our unit tests should be able to verify (at leat
somewhat) the expected behavior. (Recognize that sometimes this isn't really
possible though: ssh tests come to mind immediately)
> pid handling is failing on secure datanode
> ------------------------------------------
>
> Key: HADOOP-13238
> URL: https://issues.apache.org/jira/browse/HADOOP-13238
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts, security
> Reporter: Allen Wittenauer
> Assignee: Andras Bokor
> Attachments: HADOOP-13238.01.patch
>
>
> {code}
> hdfs --daemon stop datanode
> cat: /home/hadoop/H/pids/hadoop-hdfs-root-datanode.pid: No such file or
> directory
> WARNING: pid has changed for datanode, skip deleting pid file
> cat: /home/hadoop/H/pids/hadoop-hdfs-root-datanode.pid: No such file or
> directory
> WARNING: daemon pid has changed for datanode, skip deleting daemon pid file
> {code}
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