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https://issues.apache.org/jira/browse/HDFS-15290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17178022#comment-17178022
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Simbarashe Dzinamarira edited comment on HDFS-15290 at 8/14/20, 7:10 PM:
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Submitting v002 of patch to fix checkstyle issue.
was (Author: simbadzina):
Submitt v002 of patch to fix checkstyle issue.
> NPE in HttpServer during NameNode startup
> -----------------------------------------
>
> Key: HDFS-15290
> URL: https://issues.apache.org/jira/browse/HDFS-15290
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.10.0, 2.7.8, 3.3.0
> Reporter: Konstantin Shvachko
> Assignee: Simbarashe Dzinamarira
> Priority: Major
> Attachments: HDFS-15290.001.patch, HDFS-15290.002.patch
>
>
> When NameNode starts it first starts HttpServer, then starts loading fsImage
> and edits. While loading the namesystem field in NameNode is null. I saw that
> a StandbyNode sends a checkpoint request, which fails with NPE because
> NNStorage is not instantiated yet.
> We should check the NameNode startup status before accepting checkpoint
> requests.
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