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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11333) Print a user friendly error message when plugins are not found
Date Wed, 15 Feb 2017 11:34:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867677#comment-15867677
] 

Hudson commented on HDFS-11333:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11256 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/11256/])
HDFS-11333. Print a user friendly error message when plugins are not (weichiu: rev 859bd159ae554174200334b5eb1d7e8dbef958ad)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java


> Print a user friendly error message when plugins are not found
> --------------------------------------------------------------
>
>                 Key: HDFS-11333
>                 URL: https://issues.apache.org/jira/browse/HDFS-11333
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 0.21.0
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>            Priority: Minor
>              Labels: supportability
>             Fix For: 2.9.0, 2.7.4, 3.0.0-alpha3, 2.8.1
>
>         Attachments: HDFS-11333.001.patch, HDFS-11333.002.patch, HDFS-11333.002.patch,
HDFS-11333.003.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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