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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13090) Progress heartbeats for long running scanners
Date Fri, 06 Mar 2015 22:23:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351027#comment-14351027
] 

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

Sounds ok to me too, will be interested to see the details in a patch. 

> 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 might be filtered out depending on scan criteria. 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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