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https://issues.apache.org/jira/browse/YARN-3403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386041#comment-15386041
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Nikhil Mulley commented on YARN-3403:
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Has anything changed in 2.6?
> Nodemanager dies after a small typo in mapred-site.xml is induced
> -----------------------------------------------------------------
>
> Key: YARN-3403
> URL: https://issues.apache.org/jira/browse/YARN-3403
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.5.2
> Reporter: Nikhil Mulley
> Priority: Critical
>
> Hi,
> We have noticed that with a small typo in terms of xml config
> (mapred-site.xml) can cause the nodemanager go down completely without
> stopping/restarting it externally.
> I find it little weird that editing the config files on the filesystem, could
> cause the running slave daemon yarn nodemanager shutdown.
> In this case, I had a ending tag '/' missed in a property and that induced
> the nodemanager go down in a cluster.
> Why would nodemanager reload the configs while it is running? Are not they
> picked up when they are started? Even if they are automated to pick up the
> new configs dynamically, I think the xmllint/config checker should come in
> before the nodemanager is asked to reload/restart.
>
> ---
> java.lang.RuntimeException: org.xml.sax.SAXParseException; systemId:
> file:/etc/hadoop/conf/mapred-site.xml; lineNumber: 228; columnNumber: 3; The
> element type "value" must be terminated by the matching end-tag "</value>".
> at
> org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2348)
> ---
> Please shed light on this.
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