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https://issues.apache.org/jira/browse/HBASE-27657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17744041#comment-17744041
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Duo Zhang commented on HBASE-27657:
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o, just took a quick pass on the design doc, it is very straight-forward.
I think this is an acceptable way to pass request attributes.
Just a minor question, have you guys considered adding an 'attributes' field
to the Operation class? What is the problem for adding the field there? Because
it can not suit the batch methods?
Thanks.
> Connection and Request Attributes
> ---------------------------------
>
> Key: HBASE-27657
> URL: https://issues.apache.org/jira/browse/HBASE-27657
> Project: HBase
> Issue Type: New Feature
> Reporter: Bryan Beaudreault
> Assignee: Ray Mattingly
> Priority: Major
>
> Currently we have the ability to set Operation attributes, via
> Get.setAttribute, etc. It would be useful to be able to set attributes at the
> request and connection level.
> These levels can result in less duplication. For example, send some
> attributes once per connection instead of for every one of the millions of
> requests a connection might send. Or send once for the request, instead of
> duplicating on every operation in a multi request.
> Additionally, the Connection and RequestHeader are more globally available on
> the server side. Both can be accessed via RpcServer.getCurrentCall(), which
> is useful in various integration points – coprocessors, custom queues,
> quotas, slow log, etc. Operation attributes are harder to access because you
> need to parse the raw Message into the appropriate type to get access to the
> getter.
> I was thinking adding two new methods to Connection interface:
> - setAttribute (and getAttribute/getAttributes)
> - setRequestAttributeProvider
> Any Connection attributes would be set onto the ConnectionHeader during
> initialization. The RequestAttributeProvider would be called when creating
> each RequestHeader.
> An alternative to setRequestAttributeProvider would be to add this into
> HBaseRpcController, which can already be customized via site configuration.
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