[ https://issues.apache.org/jira/browse/HDFS-3990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daryn Sharp updated HDFS-3990: ------------------------------ Target Version/s: 2.0.2-alpha, 0.23.4, 3.0.0 (was: 0.23.4, 3.0.0, 2.0.2-alpha) Status: Patch Available (was: Open) > NN's health report has severe performance problems > -------------------------------------------------- > > Key: HDFS-3990 > URL: https://issues.apache.org/jira/browse/HDFS-3990 > Project: Hadoop HDFS > Issue Type: Bug > Components: name-node > Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Priority: Critical > Attachments: HDFS-3990.patch > > > The dfshealth page will place a read lock on the namespace while it does a > dns lookup for every DN. On a multi-thousand node cluster, this often > results in 10s+ load time for the health page. 10 concurrent requests were > found to cause 7m+ load times during which time write operations blocked. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira