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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13090) Progress heartbeats for long running scanners
Date Tue, 24 Feb 2015 17:43:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335140#comment-14335140
] 

Andrew Purtell commented on HBASE-13090:
----------------------------------------

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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