[HBASE-19893] restore_snapshot is broken in master branch when region splits

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.2.0, 2.3.0, 2.0.6, 2.1.6
• Component/s: snapshots
• Hadoop Flags: Reviewed
• Assignee: Toshihiro Suzuki
• Reporter: Toshihiro Suzuki
• Created: 30/Jan/18 07:56
• Updated: 14/Aug/19 02:39
• Resolved: 21/Jul/18 14:48

Description

When I was investigating HBASE-19850, I found restore_snapshot didn't work in master branch.

 

Steps to reproduce are as follows:

1. Create a table

create "test", "cf"

2. Load data (2000 rows) to the table

(0...2000).each{|i| put "test", "row#{i}", "cf:col", "val"}

3. Split the table

split "test"

4. Take a snapshot

snapshot "test", "snap"

5. Load more data (2000 rows) to the table and split the table agin

(2000...4000).each{|i| put "test", "row#{i}", "cf:col", "val"}
split "test"

6. Restore the table from the snapshot 

disable "test"
restore_snapshot "snap"
enable "test"

7. Scan the table

scan "test"

However, this scan returns only 244 rows (it should return 2000 rows) like the following:

hbase(main):038:0> scan "test"
ROW COLUMN+CELL
 row78 column=cf:col, timestamp=1517298307049, value=val
....
  row999 column=cf:col, timestamp=1517298307608, value=val
244 row(s)
Took 0.1500 seconds

 

Also, the restored table should have 2 online regions but it has 3 online regions.

 

Issue Links

• relates to: HBASE-22645 Backport HBASE-19893 to all 2.x branches