[jira] [Commented] (YARN-3403) Nodemanager dies after a small typo in mapred-site.xml is induced

["Weiwei Yang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-3403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727084#comment-14727084 ] 

Weiwei Yang commented on YARN-3403:
-----------------------------------

A possible solution is to cache configuration, avoid reading new properties and continue to use old ones in cache if fails to load resource. If cache is empty when a service failed to load resource, then shutdown the JVM. The problem is, does it worth the effort ? 

> 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
>            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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