[jira] [Created] (HDFS-9519) Some coding improvement in SecondaryNameNode#main

["Yongjun Zhang (JIRA)" <ji...@apache.org>]

Yongjun Zhang created HDFS-9519:
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             Summary: Some coding improvement in SecondaryNameNode#main
                 Key: HDFS-9519
                 URL: https://issues.apache.org/jira/browse/HDFS-9519
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Yongjun Zhang


Two nits:

# The checking whether secondary is null is not necessary in the following code in SecondaryNameNode.java. 
# The comment in this code seems to imply that "when secondary is not null, SNN was stared as a daemon.", and this is not true. Suggest to improve the comment to make it clear,

Assign to Xiao since he worked on HDFS-3059. Thanks Xiao.

{code}
      if (secondary != null) {
        // The web server is only needed when starting SNN as a daemon,
        // and not needed if called from shell command. Starting the web server
        // from shell may fail when getting credentials, if the environment
        // is not set up for it, which is most of the case.
        secondary.startInfoServer();

        secondary.startCheckpointThread();
        secondary.join();
      }
{code}




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