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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18042) Client Compatibility breaks between versions 1.2 and 1.3
Date Mon, 15 May 2017 23:09:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011477#comment-16011477
] 

Duo Zhang commented on HBASE-18042:
-----------------------------------

The field has been introduced in all branches, even for 0.98. So I think the fix for AsyncHBase
is straightforward? If the field is present then depend on the value of this field to decide
if we need to go to the next region. If not, use the old logic.

And we also need a fix for all branches below 1.3 I think. If this field is present then we
should not issue a new next request then. We can do it here or open a new issue.

Thanks.

> Client Compatibility breaks between versions 1.2 and 1.3
> --------------------------------------------------------
>
>                 Key: HBASE-18042
>                 URL: https://issues.apache.org/jira/browse/HBASE-18042
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.3.1
>            Reporter: Karan Mehta
>            Assignee: Karan Mehta
>
> OpenTSDB uses AsyncHBase as its client, rather than using the traditional HBase Client.
From version 1.2 to 1.3, the {{ClientProtos}} have been changed. Newer fields are added to
{{ScanResponse}} proto.
> For a typical Scan request in 1.2, would require caller to make an OpenScanner Request,
GetNextRows Request and a CloseScanner Request, based on {{more_rows}} boolean field in the
{{ScanResponse}} proto.
> However, from 1.3, new parameter {{more_results_in_region}} was added, which limits the
results per region. Therefore the client has to now manage sending all the requests for each
region. Further more, if the results are exhausted from a particular region, the {{ScanResponse}}
will set {{more_results_in_region}} to false, but {{more_results}} can still be true. Whenever
the former is set to false, the {{RegionScanner}} will also be closed. 
> OpenTSDB makes an OpenScanner Request and receives all its results in the first {{ScanResponse}}
itself, thus creating a condition as described in above paragraph. Since {{more_rows}} is
true, it will proceed to send next request at which point the {{RSRpcServices}} will throw
{{UnknownScannerException}}. The protobuf client compatibility is maintained but expected
behavior is modified.



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