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Date: Thu, 25 May 2017 09:00:13 +0000 (UTC)
From: "Duo Zhang (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.13071616.1494612248000.292238.1495702813308@Atlassian.JIRA>
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References: <JIRA.13071616.1494612248000@Atlassian.JIRA> <JIRA.13071616.1494612248552@jira-lw-us.apache.org>
Subject: [jira] [Updated] (HBASE-18042) Client Compatibility breaks between
 versions 1.2 and 1.3
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archived-at: Thu, 25 May 2017 09:00:19 -0000


     [ https://issues.apache.org/jira/browse/HBASE-18042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duo Zhang updated HBASE-18042:
------------------------------
    Attachment: HBASE-18042-branch-1.3.patch

> 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-1.3.patch, 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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