[HBASE-16299] Update REST API scanner with ability to do reverse scan

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.1.2
• Fix Version/s: 1.4.0, 0.98.22, 2.0.0
• Component/s: REST

Environment

Not environment specific (tested on HDP 2.4.2)

• Hadoop Flags: Reviewed
• Assignee: Minwoo Kang
• Reporter: Bjorn Olsen
• Created: 28/Jul/16 10:36
• Updated: 25/Aug/16 17:21
• Resolved: 08/Aug/16 08:58

Description

HBASE-4811 "Support reverse scan" was implemented from version 0.98.0, and is available in the Java API.
However this functionality is not yet exposed via REST.

Example of expected API call:
http://server:port/table/*?startrow=1&endrow=10&reversed=true"
(Returns rows ordered by key in reverse, eg from 9*** to 1*** )

Based on my (limited) understanding this should be simple to add.
See org.apach.hadoop.hbase.rest.TableResource.getScanResource
This function creates a Scan object with parameters passed in from the REST API (I assume).

Adding this functionality may be as simple as adding a "reversed" parameter to the REST API which passes down to where the Scan object is created in TableResource.getScanResource.

Issue Links

• links to: Review Board (branch-1.3)