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https://issues.apache.org/jira/browse/HDFS-14728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913414#comment-16913414
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xuzq commented on HDFS-14728:
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Thanks [~elgoiri] and [~ayushtkn] for the comment.
Please review [^HDFS-14728-trunk-008.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,
> HDFS-14728-trunk-005.patch, HDFS-14728-trunk-006.patch,
> HDFS-14728-trunk-007.patch, HDFS-14728-trunk-008.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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