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https://issues.apache.org/jira/browse/HDFS-9519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049978#comment-15049978
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Xiao Chen commented on HDFS-9519:
---------------------------------
Thanks Yongjun. I agree with your general idea that we should focus on the 2
modes instead of the web server itself. Quick clarification:
'Run as a daemon' is not limited to 'no command is specified' - if {{-format}}
is given, after {{parseArgs}}, {{opts.getCommand()}} still returns null so that
2NN is still started as a daemon.
Uploaded patch 2 which I think explains it clearer. Please let me know what you
think.
> 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
> Assignee: Xiao Chen
> Attachments: HDFS-9519.01.patch, HDFS-9519.02.patch
>
>
> 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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