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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11333) Namenode unable to start if plugins can not be found
Date Wed, 11 Jan 2017 21:49:16 GMT
Wei-Chiu Chuang created HDFS-11333:

             Summary: 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

If NameNode is unable to find plugins (specified in dfs.namenode.plugins), it terminates abruptly
with the following stack trace:
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)

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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