schematracker: treat TableInfo as immutable#39103
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Signed-off-by: lance6716 <lance6716@gmail.com>
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| tblInfo, err := d.TableByName(ti.Schema, ti.Name) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
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| tblInfo = tblInfo.Clone() | ||
| defer func() { | ||
| if err == nil { | ||
| _ = d.PutTable(ti.Schema, tblInfo) | ||
| } | ||
| }() | ||
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this part code has many same parts in the file.
Signed-off-by: lance6716 <lance6716@gmail.com>
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ptal @GMHDBJD @CharlesCheung96 |
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/cc @gozssky |
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/merge |
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This pull request has been accepted and is ready to merge. DetailsCommit hash: e896b64 |
TiDB MergeCI notify🔴 Bad News! New failing [1] after this pr merged.
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Signed-off-by: lance6716 lance6716@gmail.com
What problem does this PR solve?
Issue Number: ref #35933
Problem Summary:
before this PR, DM needs to clone the TableInfo after reading in order to avoid data race with SchemaTracker, but that consumes much memory. After this PR TableInfo is immutable so no need to clone it.
What is changed and how it works?
before SchemaTracker will modify a TableInfo, it will clone it first. After the modification, it will put it to InfoStore.
Check List
Tests
Side effects
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Release note
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