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https://issues.apache.org/jira/browse/HBASE-13984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15018030#comment-15018030
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He Liangliang commented on HBASE-13984:
---------------------------------------
There is one case in TestScannerHeartbeatMessages but added more in the new
patch.
> Add option to allow caller to know the heartbeat and scanner position when
> scanner timeout
> ------------------------------------------------------------------------------------------
>
> Key: HBASE-13984
> URL: https://issues.apache.org/jira/browse/HBASE-13984
> Project: HBase
> Issue Type: Improvement
> Components: Scanners
> Reporter: He Liangliang
> Assignee: He Liangliang
> Attachments: HBASE-13984-V1.diff, HBASE-13984-V2.diff,
> HBASE-13984-V3.diff, HBASE-13984-V3.patch, HBASE-13984-V4.diff,
> HBASE-13984-V5.diff
>
>
> HBASE-13090 introduced scanner heartbeat. However, there are still some
> limitations (see HBASE-13215). In some application, for example, an operation
> access hbase to scan table data, and there is strict limit that this call
> must return in a fixed interval. At the same time, this call is stateless, so
> the call must return the next position to continue the scan. This is typical
> use case for online applications.
> Based on this requirement, some improvements are proposed:
> 1. Allow client set a flag whether pass the heartbeat (a result contains the
> scanner position) to the caller (via ResultScanner next)
> 2. Allow the client pass a timeout to the server, which can override the
> server side default value
> 3. When requested by the client, the server peek the next cell and return to
> the client in the heartbeat message
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