xuzq updated HDFS-14728:
    Attachment: HDFS-14728-trunk-004.patch

> 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
>            Assignee: xuzq
>            Priority: Major
>         Attachments: HDFS-14728-trunk-001.patch, HDFS-14728-trunk-002.patch, 
> HDFS-14728-trunk-003.patch, HDFS-14728-trunk-004.patch
> 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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