hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13333) Renew Scanner Lease without advancing the RegionScanner
Date Sat, 09 Sep 2017 06:59:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16159793#comment-16159793
] 

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

The patch for HBASE-13333 addes the renewLease() to different classes.
* branch-1 : AbstractClientScanner#renewLease()
* master : ResultScanner#renewLease()

And then HBASE-17584 moved the renewLease() from AbstractClientScanner to ResultScanner for
branch-1. 

In short. the location of renewLease() is shown below.
* branch-1.3/branch-1.2 : AbstractClientScanner (introduced by HBASE-13333)
* branch-1/branch-1.4 : ResultScanner (introduced by HBASE-17584) 
* master/branch-2 : ResultScanner (introduced by HBASE-13333)

> 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?



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

Mime
View raw message