Wei-Chiu Chuang created HDFS-11333:
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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:
{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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