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https://issues.apache.org/jira/browse/HDFS-14728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xuzq updated HDFS-14728:
------------------------
Assignee: xuzq
Attachment: HDFS-14728-trunk-001.patch
Status: Patch Available (was: Open)
> 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
>
>
> 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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