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https://issues.apache.org/jira/browse/HBASE-13090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335140#comment-14335140
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Andrew Purtell commented on HBASE-13090:
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Perhaps as simple as checking from a timer if any Results have been sent over
the preceding interval, forcing back an empty one if none have been sent and no
new results are available yet.
> Progress heartbeats for long running scanners
> ---------------------------------------------
>
> Key: HBASE-13090
> URL: https://issues.apache.org/jira/browse/HBASE-13090
> Project: HBase
> Issue Type: New Feature
> Reporter: Andrew Purtell
>
> It can be necessary to set very long timeouts for clients that issue scans
> over large regions when all data in the region is filtered out. This is a
> usability concern because it can be hard to identify what worst case timeout
> to use until scans are occasionally/intermittently failing in production,
> depending on variable scan criteria. It would be better if the client-server
> scan protocol can send back periodic progress heartbeats to clients as long
> as server scanners are alive and making progress.
> This is related but orthogonal to streaming scan (HBASE-13071).
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