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https://issues.apache.org/jira/browse/HBASE-16838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15637995#comment-15637995
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Duo Zhang commented on HBASE-16838:
-----------------------------------
There is another reason for smallScan is the limit. Maybe we could add it to
scan? Otherwise the RS can not know the scan is exhausted. We need to also
modify the logic of RS to support it? And the small flag is deprecated then?
And in general, the scan method introduced here is only for experts, we do not
want every user to call it directly. But for a small scan it just returns a
CompletableFuture so it is much easier to use.
Thanks.
> Implement basic scan
> --------------------
>
> Key: HBASE-16838
> URL: https://issues.apache.org/jira/browse/HBASE-16838
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 2.0.0
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Fix For: 2.0.0
>
> Attachments: HBASE-16838-v1.patch, HBASE-16838-v2.patch,
> HBASE-16838.patch
>
>
> Implement a scan works like the grpc streaming call that all returned results
> will be passed to a ScanObserver. The methods of the observer will be called
> directly in the rpc framework threads so it is not allowed to do time
> consuming work in the methods. So in general only experts or the
> implementation of other methods in AsyncTable can call this method directly,
> that's why I call it 'basic scan'.
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