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From "Bryan Beaudreault (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13333) Renew Scanner Lease without advancing the RegionScanner
Date Fri, 27 Mar 2015 18:25:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14384306#comment-14384306

Bryan Beaudreault commented on HBASE-13333:

Thanks [~lhofhansl], I actually think your name is better.  Back then I was thinking of this
more from the POV of hadoop (which has a context.progress()) method.  But this name actually
makes more sense in an HBase context IMO.

> Renew Scanner Lease without advancing the RegionScanner
> -------------------------------------------------------
>                 Key: HBASE-13333
>                 URL: https://issues.apache.org/jira/browse/HBASE-13333
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>         Attachments: 13333-0.98.txt
> We have a usecase (for Phoenix) where we want to let the server know that the client
is still around. Like a client-side heartbeat.
> Doing a full heartbeat is complicated, but we could add the ability to make scanner call
with caching set to 0. The server already does the right thing (it renews the lease, but does
not advance the scanner).
> It looks like the client (ScannerCallable) also does the right thing. We cannot break
ResultScanner before HBase 2.0, but we can add a renewLease() method to AbstractClientScaner.
Phoenix (or any other caller) can then cast to ClientScanner and call that method to ensure
we renew the lease on the server.
> It would be a simple and fully backwards compatible change. [~giacomotaylor]
> Comments?

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