Daryn Sharp created HDFS-3990:
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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.
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