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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 edited comment on HDFS-10702 at 8/19/16 8:35 PM:
------------------------------------------------------------
Upload a patch 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.
was (Author: clouderajiayi):
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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