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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18042) Client Compatibility breaks between versions 1.2 and 1.3
Date Thu, 25 May 2017 08:10:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024374#comment-16024374
] 

Hadoop QA commented on HBASE-18042:
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12869817/HBASE-18042-branch-1-v1.patch
|
| JIRA Issue | HBASE-18042 |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/6944/console |
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> 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
>          Components: regionserver, scan
>    Affects Versions: 2.0.0, 1.4.0, 1.3.1
>            Reporter: Karan Mehta
>            Assignee: Duo Zhang
>            Priority: Critical
>             Fix For: 2.0.0, 1.4.0, 1.3.2
>
>         Attachments: HBASE-18042-branch-1.patch, HBASE-18042-branch-1.patch, HBASE-18042-branch-1-v1.patch,
HBASE-18042.patch, HBASE-18042-v1.patch, HBASE-18042-v2.patch
>
>
> 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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