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From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13333) Renew Scanner Lease without advancing the RegionScanner
Date Fri, 08 Sep 2017 09:31:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158383#comment-16158383
] 

Chia-Ping Tsai commented on HBASE-13333:
----------------------------------------

{code}
$ git status
On branch branch-1.3
Your branch is up-to-date with 'origin/branch-1.3'.
nothing to commit, working tree clean
$ git log --grep=13333
commit 0e76cf5be41485849c7330a0dec281cadad7d135
Author: Lars Hofhansl <larsh@apache.org>
Date:   Sat May 2 17:52:27 2015 -0700

    HBASE-13333 Renew Scanner Lease without advancing the RegionScanner.
{code}
It was already in 1.3. 

> 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
>            Assignee: Lars Hofhansl
>             Fix For: 2.0.0, 0.98.13, 1.0.2, 1.2.0, 1.1.1
>
>         Attachments: 13333-0.98.txt, 13333-master.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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