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From "Jiayi Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
Date Fri, 19 Aug 2016 20:36:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428772#comment-15428772
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Jiayi Zhou commented on HDFS-10702:
-----------------------------------

Upload a path to fix some of the issues commented by Andrew. I haven't worked on the RpcHeader
modification yet, want to see if the new patch runs properly first.

* Fix nitty issues. 
* Remove MethodCategory and use annotations instead. Add a new annotation ReadOnly.
* Idea of SyncInfo is also to add more fields in the future. NamenodeProtocol#getTransactionID
is commented as NameNodeProtocol rather that ClientProtocol, so I add getSyncInfo() for ClientProtocol.
Remove state from SyncInfo because we no longer need it. 

> 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, 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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