Andrew Wang created HDFS-5369:
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Summary: Support negative caching of user-group mapping
Key: HDFS-5369
URL: https://issues.apache.org/jira/browse/HDFS-5369
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 2.2.0
Reporter: Andrew Wang
We've seen a situation at a couple of our customers where interactions from an
unknown user leads to a high-rate of group mapping calls. In one case, this was
happening at a rate of 450 calls per second with the shell-based group mapping,
enough to severely impact overall namenode performance and also leading to
large amounts of log spam (prints a stack trace each time).
Let's consider negative caching of group mapping, as well as quashing the rate
of this log message.
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