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https://issues.apache.org/jira/browse/KNOX-1237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746435#comment-16746435
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Dequan Chen commented on KNOX-1237:
-----------------------------------
[~risdenk]:
The implementation of the Knox Shell HBase stateless scanner is to use a
temporary stateful scanner ID to get all the data of a user's request by >=1
step(s) and return the complete data to the user depending on the request
(version #, columns, rows etc). So the user does not need to create any
stateful scanner(s) to loop through all possible steps for each step's data +
combining the data as a whole.... Therefore, the user does not see any stateful
scanner action because of the encapsulation adopted in the object-oriented
implementation. Hope that the explanation helps you understand that.
Dequan
1/18/2019
> Knox DSL should support HBase Stateless Scanner
> -----------------------------------------------
>
> Key: KNOX-1237
> URL: https://issues.apache.org/jira/browse/KNOX-1237
> Project: Apache Knox
> Issue Type: Improvement
> Components: ClientDSL
> Reporter: Kevin Risden
> Assignee: Dequan Chen
> Priority: Minor
> Fix For: 1.3.0
>
> Attachments: KNOX-1237.patch, KNOX-1237.patch
>
>
> KNOX-8 added support for HBase REST apis via Knox. The Knox DSL supports
> stateful scanners as shown in the documentation
> (https://knox.apache.org/books/knox-1-0-0/user-guide.html#table(String+tableName).scanner().create()+-+Scanner+Creation).
> HBase REST supports stateless scanners
> ([https://hbase.apache.org/1.2/apidocs/org/apache/hadoop/hbase/rest/package-summary.html#operation_stateless_scanner])
> which can be easily load balanced. The feature is not well documented in
> HBase REST.
> Currently if using stateful scanners and Knox or HBase REST is being load
> balanced, there will be an issue using that scanner. The stateless scanners
> avoid this since they have all the information necessary.
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