Junegunn Choi created HBASE-29245:
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Summary: Region reopening batch size not increased when backoff is
zero
Key: HBASE-29245
URL: https://issues.apache.org/jira/browse/HBASE-29245
Project: HBase
Issue Type: Bug
Reporter: Junegunn Choi
Attachments: image-2025-04-08-15-46-35-759.png,
image-2025-04-08-15-46-44-588.png
h2. Problem
{{hbase.reopen.table.regions.progressive.batch.size.max}} added in HBASE-28215
is for making HBase reopen regions in batches on an alter operation. The batch
size is expected to be gradually increased from 1 to the specified maximum.
(i.e. 1, 2, 4, 8, 16, ..., max) However, when
{{hbase.reopen.table.regions.progressive.batch.backoff.ms}} is set to 0, which
is the default, the batch size is not increased. So whatever the maximum value
is, HBase will reopen only one region at a time.
h2. Workaround
Use a non-zero backoff value, such as 1, even if you don't need backoff.
h2. Solution
Make a slight modification to the code so that the batch size is increased even
when backoff is 0.
h2. Test
The existing test case was updated to validate the progressive growth of the
batch size.
h2. Manual testing
Tested the fix locally, and confirmed that the batch size increases as expected.
!image-2025-04-08-15-46-35-759.png|width=600!
!image-2025-04-08-15-46-44-588.png|width=600!
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