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Online DDL: more support for INSTANT DDL #11591

Merged
merged 2 commits into from
Oct 27, 2022
Merged

Online DDL: more support for INSTANT DDL #11591

merged 2 commits into from
Oct 27, 2022

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shlomi-noach
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Description

Followup to #10402, in this PR:

  • INSTANT DDL is supported by ddl_strategy flag --prefer-instant-ddl
  • Added support for ENUM/SET instant DDLs
  • A minor validation for DROP COLUMN (INSTANT not supported in COMPRESSED tables)

As reminders/context:

  • MySQL supports INSTANT DDL for some limited types of ALTER TABLE operations
  • When --prefer-instant-ddl is specified, we capture and analyze those specific operations
  • If applicable to INSTANT, we add ALGORITHM=INSTANT and run the schema migration directly, and do not pass it through to gh-ost nor vitess/vreplication.
  • Schema changes executed with INSTANT algorithm are non-revertible.

Related Issue(s)

Tracking: #6926

Checklist

  • "Backport me!" label has been added if this change should be backported
  • Tests were added or are not required
  • Documentation was added or is not required

Deployment Notes

@shlomi-noach
Online DDL: support instant DDL for enum changes; strategy flag now c…
cfdc1a7 
…alled '--prefer-instant-ddl'

Signed-off-by: Shlomi Noach <[email protected]>
@shlomi-noach shlomi-noach requested review from dbussink and a team October 27, 2022 07:50
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vitess-bot bot commented Oct 27, 2022 •
edited by dbussink
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dbussink
dbussink approved these changes Oct 27, 2022
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One tiny spelling nit 😄

go/vt/vttablet/onlineddl/analysis_test.go Outdated
version: "8.0.21",
create: "create table t(id int, i1 int not null, primary key(id))",
alter: "alter table t modify column i1 int default null",
instant: false,
},
{
// fail because on top of changing the default valuem, the datatype is changed, too
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Type with valuem

@shlomi-noach
typo
d882899 
Signed-off-by: Shlomi Noach <[email protected]>
@shlomi-noach shlomi-noach added Type: Enhancement Logical improvement (somewhere between a bug and feature) Component: Query Serving labels Oct 27, 2022
@shlomi-noach shlomi-noach merged commit 6ac536c into vitessio:main Oct 27, 2022
@shlomi-noach shlomi-noach deleted the online-ddl-more-instant-ddl branch October 27, 2022 11:37
notfelineit pushed a commit to planetscale/vitess that referenced this pull request Nov 16, 2022
@shlomi-noach
Online DDL: more support for INSTANT DDL (vitessio#11591) (vitessio#1229
baf7f63 
)

* Online DDL: support instant DDL for enum changes; strategy flag now called '--prefer-instant-ddl'

Signed-off-by: Shlomi Noach <[email protected]>

* typo

Signed-off-by: Shlomi Noach <[email protected]>

Signed-off-by: Shlomi Noach <[email protected]>

Signed-off-by: Shlomi Noach <[email protected]>
@shlomi-noach shlomi-noach mentioned this pull request Apr 8, 2024
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@shlomi-noach shlomi-noach mentioned this pull request Nov 26, 2024
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@dbussink dbussink dbussink approved these changes

@harshit-gangal harshit-gangal Awaiting requested review from harshit-gangal harshit-gangal is a code owner

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