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https://issues.apache.org/jira/browse/HDFS-10246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15221980#comment-15221980
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Ming Ma commented on HDFS-10246:
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[~piaoyu zhang] based on the thread dump you provided, it is HDFS-7609 which
caused {{addCacheEntry}} to hold the {{FSNamesystem}}'s lock for too long. To
add to [~vinayrpet]'s point, with HDFS-7182 jmx access doesn't need to acquire
{{FSNamesystem}}'s lock.
> HDFS Standby NameNode dfshealth.jsp Response very slow
> ----------------------------------------------------------
>
> Key: HDFS-10246
> URL: https://issues.apache.org/jira/browse/HDFS-10246
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.2.0
> Environment: CentOS6.3 Hadoop-2.2.0
> Reporter: zhangyubiao
> Labels: bug
> Attachments: stacks.txt
>
>
> HDFS Standby NameNode dfshealth.jsp Response very slow
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