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https://issues.apache.org/jira/browse/HDFS-14728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909357#comment-16909357
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Íñigo Goiri commented on HDFS-14728:
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In the tests, we should not use sleeps.
We need to wait for particular conditions
> 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
>
>
> 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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