[HBASE-18066] Get with closest_row_before on "hbase:meta" can return empty Cell during region merge/split

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.1
• Fix Version/s: 1.4.0, 1.3.2, 1.1.11, 1.2.7
• Component/s: regionserver

Environment

Linux (16.04.2), MacOS 10.11.6.
Standalone and distributed HBase setup.

• Hadoop Flags: Reviewed
• Assignee: Zheng Hu
• Reporter: Andrey Elenskiy
• Created: 16/May/17 22:57
• Updated: 01/Aug/18 06:22
• Resolved: 07/Jun/17 00:14

Description

During region split/merge there's a brief period of time where doing a "Get" with "closest_row_before=true" on "hbase:meta" may return empty "GetResponse.result.cell" field even though parent, splitA and splitB regions are all in "hbase:meta". Both gohbase (https://github.com/tsuna/gohbase) and AsyncHBase (https://github.com/OpenTSDB/asynchbase) interprets this as "TableDoesNotExist", which is returned to the client.

Here's a gist that reproduces this problem: https://gist.github.com/Timoha/c7a236b768be9220e85e53e1ca53bf96. Note that you have to use older HTable client (I used 1.2.4) as current versions ignore `Get.setClosestRowBefore(bool)` option.

Issue Links

• links to: Review Board