xuzq created HDFS-14728:
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Summary: RBF：GetDatanodeReport causes a large GC pressure on the
NameNodes
Key: HDFS-14728
URL: https://issues.apache.org/jira/browse/HDFS-14728
Project: Hadoop HDFS
Issue Type: Improvement
Components: rbf
Reporter: xuzq
When a cluster contains millions of DNs, *GetDatanodeReport* is pretty
expensive, and it will cause a large GC pressure on NameNode.
When multiple NSs share the millions DNs by federation and the router listens
to the NSs, the problem will be more serious.
All the NSs will be GC at the same time.
RBF should cache the datanode report informations and have an option to disable
the cache.
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