Daryn Sharp created HDFS-3990: --------------------------------- Summary: 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
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