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https://issues.apache.org/jira/browse/HDFS-7734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14305190#comment-14305190
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Kihwal Lee commented on HDFS-7734:
----------------------------------
Since {{MiniDFSCluster}} directly calls {{createNamenode()}}, existing unit
tests didn't caught this bug. We can either add a new test case or add a smoke
test that brings up a pseudo distributed file system and runs simple tests
during precommit.
> Class cast exception in NameNode#main
> -------------------------------------
>
> Key: HDFS-7734
> URL: https://issues.apache.org/jira/browse/HDFS-7734
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.7.0
> Reporter: Arpit Agarwal
> Assignee: Yi Liu
> Priority: Blocker
> Attachments: HDFS-7734.001.patch, HDFS-7734.002.patch
>
>
> NameNode hits the following exception immediately on startup.
> {code}
> 15/02/03 15:50:25 ERROR namenode.NameNode: Failed to start namenode.
> java.lang.ClassCastException: org.apache.log4j.Logger cannot be cast to
> org.apache.commons.logging.Log
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1557)
> 15/02/03 15:50:25 INFO util.ExitUtil: Exiting with status 1
> {code}
> Location of the exception in NameNode.java:
> {code}
> public static void main(String argv[]) throws Exception {
> if (DFSUtil.parseHelpArgument(argv, NameNode.USAGE, System.out, true)) {
> System.exit(0);
> }
> try {
> StringUtils.startupShutdownMessage(NameNode.class, argv,
> (org.apache.commons.logging.Log)
> LogManager.getLogger(LOG.getName())); <<<<< Failed here.
> {code}
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