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https://issues.apache.org/jira/browse/HADOOP-13632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15623201#comment-15623201
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Andrew Wang commented on HADOOP-13632:
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Hi [~aw], could I get a review?
> Daemonization does not check process liveness before renicing
> -------------------------------------------------------------
>
> Key: HADOOP-13632
> URL: https://issues.apache.org/jira/browse/HADOOP-13632
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: HADOOP-13632.001.patch
>
>
> If you try to daemonize a process that is incorrectly configured, it will die
> quite quickly. However, the daemonization function will still try to renice
> it even if it's down, leading to something like this for my namenode:
> {noformat}
> -> % bin/hdfs --daemon start namenode
> ERROR: Cannot set priority of namenode process 12036
> {noformat}
> It'd be more user-friendly instead of this renice error, we said that the
> process couldn't be started.
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