Relax singleton-context constraint for pending non-singleton-context reverts #10114
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Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
shlomi-noach
added
Type: Enhancement
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Call for review |
mattlord
reviewed
May 2, 2022
go/test/endtoend/onlineddl/singleton/onlineddl_singleton_test.go
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go/vt/vttablet/onlineddl/executor.go
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| revertedUUID, _ := pendingOnlineDDL.GetRevertUUID() | ||
| if revertedUUID == "" { |
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This feels like an opportunity for undefined behavior in the future. Any reason not to do this instead?
if _, err := pendingOnlineDDL.GetRevertUUID(); errors.Is(err, vtrpcpb.Code_INVALID_ARGUMENT) {
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changed to if _, err := pendingOnlineDDL.GetRevertUUID(); err != nil ; I prefer not to rely on a specific error code.
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
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no no, thank you |
shlomi-noach
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singleton-context-allow-reverts-without-single-context
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Description
When a migration runs with -singleton-context ddl strategy flag, and with context
A, then another migration with-singleton-contextcan only be submitted if it has same contextA, and cannot be submitted if it has contextB. Note, the submission itself returns with an error.We want to have better user experience when it comes to reverts. Reverts may be long running and are allowed to run concurrently to other migrations.
A REVERT can run without a
-singleton-contextflag. In fact, this is the canonical way of running it. So we do not fail submitting a REVERT even if there are pending migrations.However, what happens when a REVERT is already running, and a new migration comes in?
Starting this PR, the following holds true:
-singleton-context-singleton-contextand with some arbitrarymigration_context.To clarify:
-singleton-contextflag with some-migration_context=A-singleton-contextflag may only be submitted it it also has-migration_context=A, and it will be rejected if it has-migration_context=BThe reason we add this relaxation is that we see an operational pattern in usage, and this behavior makes sense operationally.
Documentation to follow.
Related Issue(s)
-singleton-contextflag #7946Checklist