[
https://issues.apache.org/jira/browse/HDFS-14728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16908352#comment-16908352
]
Íñigo Goiri commented on HDFS-14728:
------------------------------------
The checkstyle complain might point into the good direction... this constructor
is getting way too long.
Can we do all this init in a function called {{initDNReportCache()}} or similar?
> 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
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.14#76016)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
