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Posted to hdfs-issues@hadoop.apache.org by "Zhe Zhang (JIRA)" <ji...@apache.org> on 2016/09/06 06:00:29 UTC
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider
to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15466529#comment-15466529 ]
Zhe Zhang commented on HDFS-10702:
----------------------------------
Linking this to HDFS-8940 since both aim to offload read-only metadata operations from active NN.
> Add a Client API and Proxy Provider to enable stale read from Standby
> ---------------------------------------------------------------------
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jiayi Zhou
> Assignee: Jiayi Zhou
> Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing any metadata operation, which means active NameNode could be a bottleneck for scalability. One way to solve this problem is to send read-only operations to Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from Standby which gives Client the power to set the staleness restriction.
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