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ddl: fix unstable tests #26513

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merged 10 commits into from
Aug 5, 2021
Merged

ddl: fix unstable tests #26513

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3d229de
done
wjhuang2016 Jul 23, 2021
184da2d
clean
wjhuang2016 Jul 23, 2021
59dc7cf
Merge branch 'master' of https://github.com/pingcap/tidb into fix_uns…
wjhuang2016 Jul 23, 2021
c391931
fix
wjhuang2016 Jul 23, 2021
d7acce3
Merge branch 'master' into fix_unstable_test
wjhuang2016 Jul 23, 2021
8085996
Update ddl/db_test.go
wjhuang2016 Aug 4, 2021
5c5f251
Merge branch 'master' into fix_unstable_test
ti-chi-bot Aug 5, 2021
2a9a8be
Merge branch 'master' into fix_unstable_test
ti-chi-bot Aug 5, 2021
fda24c6
Merge branch 'master' into fix_unstable_test
ti-chi-bot Aug 5, 2021
70de439
Merge branch 'master' into fix_unstable_test
ti-chi-bot Aug 5, 2021
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7 changes: 3 additions & 4 deletions ddl/db_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -294,7 +294,6 @@ func backgroundExec(s kv.Storage, sql string, done chan error) {

// TestAddPrimaryKeyRollback1 is used to test scenarios that will roll back when a duplicate primary key is encountered.
func (s *testDBSuite8) TestAddPrimaryKeyRollback1(c *C) {
c.Skip("unstable, skip it and fix it before 20210705")
hasNullValsInKey := false
idxName := "PRIMARY"
addIdxSQL := "alter table t1 add primary key c3_index (c3);"
Expand All @@ -312,7 +311,6 @@ func (s *testDBSuite8) TestAddPrimaryKeyRollback2(c *C) {
}

func (s *testDBSuite2) TestAddUniqueIndexRollback(c *C) {
c.Skip("unstable, skip it and fix it before 20210702")
hasNullValsInKey := false
idxName := "c3_index"
addIdxSQL := "create unique index c3_index on t1 (c3)"
Expand Down Expand Up @@ -516,8 +514,9 @@ LOOP:
// delete some rows, and add some data
for i := count; i < count+step; i++ {
n := rand.Intn(count)
// Don't delete this row, otherwise error message would change.
if n == defaultBatchSize*2-10 {
// (2048, 2038, 2038) and (2038, 2038, 2038)
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I don't get the comment here. Could you add an explanation with more details?

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These are the two duplicate rows. So we shouldn't delete either of them.

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rand.Intn(2048) won't return 2048, according to the doc: https://pkg.go.dev/math/rand#Rand.Intn

BTW, it's a little hard to understand. Why not just remove data in the range of [0, 2037]?

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count += step, so it may > 2048.
This test wants to randomly delete some rows. So it doesn't remove data in the range of [0, 2037] directly.
It's not easy to understand, that why I missed this check at the first fix.

// Don't delete rows where c1 is 2048 or 2038, otherwise, the entry value in duplicated error message would change.
if n == defaultBatchSize*2-10 || n == defaultBatchSize*2 {
continue
}
tk.MustExec("delete from t1 where c1 = ?", n)
Expand Down