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https://issues.apache.org/jira/browse/HDFS-11333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822925#comment-15822925
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Allen Wittenauer commented on HDFS-11333:
-----------------------------------------
Plugins are used for a variety of things, including security. Starting up the
NN when a security plugin is missing will also lower the security of the NN.
That would be a *very* bad thing. It seems like catching, logging, and then
failing to start is the correct behavior.
> Namenode unable to start if plugins can not be found
> ----------------------------------------------------
>
> Key: HDFS-11333
> URL: https://issues.apache.org/jira/browse/HDFS-11333
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 0.21.0
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Labels: supportability
> Attachments: HDFS-11333.001.patch
>
>
> If NameNode is unable to find plugins (specified in dfs.namenode.plugins), it
> terminates abruptly with the following stack trace:
> {quote}
> Failed to start namenode.
> java.lang.RuntimeException: java.lang.ClassNotFoundException: Class XXX not
> found
> at org.apache.hadoop.conf.Configuration.getClasses(Configuration.java:2178)
> at
> org.apache.hadoop.conf.Configuration.getInstances(Configuration.java:2250)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.startCommonServices(NameNode.java:713)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:691)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:843)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:822)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1543)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1611)
> {quote}
> We should catch this exception, log a warning message and let it proceed, as
> missing the third party library does not affect the functionality of
> NameNode. We caught this bug during a CDH upgrade where a third party plugin
> was not in the lib directory of the newer version of CDH.
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