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Merge pull request cockroachdb#32318 from bdarnell/backport-disable-t…
…imebound backport-2.1: batcheval: Disable time-bound iterators in KV commands
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,200 @@ | ||
| // Copyright 2018 The Cockroach Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or | ||
| // implied. See the License for the specific language governing | ||
| // permissions and limitations under the License. See the AUTHORS file | ||
| // for names of contributors. | ||
|
|
||
| package batcheval | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "testing" | ||
|
|
||
| "github.com/cockroachdb/cockroach/pkg/keys" | ||
| "github.com/cockroachdb/cockroach/pkg/roachpb" | ||
| "github.com/cockroachdb/cockroach/pkg/storage/engine" | ||
| "github.com/cockroachdb/cockroach/pkg/storage/engine/enginepb" | ||
| "github.com/cockroachdb/cockroach/pkg/util/hlc" | ||
| "github.com/cockroachdb/cockroach/pkg/util/leaktest" | ||
| "github.com/cockroachdb/cockroach/pkg/util/uuid" | ||
| ) | ||
|
|
||
| // TestRefreshRangeTimeBoundIterator is a regression test for | ||
| // https://github.com/cockroachdb/cockroach/issues/31823. RefreshRange | ||
| // uses a time-bound iterator, which has a bug that can cause old | ||
| // resolved intents to incorrectly appear to be pending. This test | ||
| // constructs the necessary arrangement of sstables to reproduce the | ||
| // bug and ensures that the workaround (and later, the permanent fix) | ||
| // are effective. | ||
| // | ||
| // The bug is that resolving an intent does not contribute to the | ||
| // sstable's timestamp bounds, so that if there is no other | ||
| // timestamped data expanding the bounds, time-bound iterators may | ||
| // open fewer sstables than necessary and only see the intent, not its | ||
| // resolution. | ||
| // | ||
| // This test creates two sstables. The first contains a pending intent | ||
| // at ts1 and another key at ts4, giving it timestamp bounds 1-4 (and | ||
| // putting it in scope for transactions at timestamps higher than | ||
| // ts1). | ||
| func TestRefreshRangeTimeBoundIterator(t *testing.T) { | ||
| defer leaktest.AfterTest(t)() | ||
|
|
||
| ctx := context.Background() | ||
| k := roachpb.Key("a") | ||
| v := roachpb.MakeValueFromString("hi") | ||
| ts1 := hlc.Timestamp{WallTime: 1} | ||
| ts2 := hlc.Timestamp{WallTime: 2} | ||
| ts3 := hlc.Timestamp{WallTime: 3} | ||
| ts4 := hlc.Timestamp{WallTime: 4} | ||
|
|
||
| // Create an sstable containing an unresolved intent. To reduce the | ||
| // amount of knowledge of MVCC internals we must embed here, we | ||
| // write to a temporary engine and extract the RocksDB KV data. The | ||
| // sstable also contains an unrelated key at a higher timestamp to | ||
| // widen its bounds. | ||
| intentSSTContents := func() []byte { | ||
| db := engine.NewInMem(roachpb.Attributes{}, 10<<20) | ||
| defer db.Close() | ||
|
|
||
| txn := &roachpb.Transaction{ | ||
| TxnMeta: enginepb.TxnMeta{ | ||
| Key: k, | ||
| ID: uuid.MakeV4(), | ||
| Epoch: 1, | ||
| Timestamp: ts1, | ||
| }, | ||
| } | ||
| if err := engine.MVCCPut(ctx, db, nil, k, txn.Timestamp, v, txn); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| if err := engine.MVCCPut(ctx, db, nil, roachpb.Key("unused1"), ts4, v, nil); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| sstWriter, err := engine.MakeRocksDBSstFileWriter() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| it := db.NewIterator(engine.IterOptions{ | ||
| UpperBound: keys.MaxKey, | ||
| }) | ||
| defer it.Close() | ||
| it.Seek(engine.MVCCKey{Key: keys.MinKey}) | ||
| for { | ||
| ok, err := it.Valid() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if !ok { | ||
| break | ||
| } | ||
| if err := sstWriter.Add(engine.MVCCKeyValue{Key: it.Key(), Value: it.Value()}); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| it.Next() | ||
| } | ||
|
|
||
| sstContents, err := sstWriter.Finish() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| return sstContents | ||
| }() | ||
|
|
||
| // Create a second sstable containing the resolution of the intent | ||
| // (committed). This is a rocksdb tombstone and there's no good way | ||
| // to construct that as we did above, so we do it by hand. The | ||
| // sstable also has a second write at a different (older) timestamp, | ||
| // because if it were empty other than the deletion tombstone, it | ||
| // would not have any timestamp bounds and would be selected for | ||
| // every read. | ||
| resolveSSTContents := func() []byte { | ||
| sstWriter, err := engine.MakeRocksDBSstFileWriter() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := sstWriter.Delete(engine.MakeMVCCMetadataKey(k)); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := sstWriter.Add(engine.MVCCKeyValue{ | ||
| Key: engine.MVCCKey{ | ||
| Key: roachpb.Key("unused2"), | ||
| Timestamp: ts1, | ||
| }, | ||
| Value: nil, | ||
| }); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| sstContents, err := sstWriter.Finish() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| return sstContents | ||
| }() | ||
|
|
||
| // Create a new DB and ingest our two sstables. | ||
| db := engine.NewInMem(roachpb.Attributes{}, 10<<20) | ||
| defer db.Close() | ||
|
|
||
| for i, contents := range [][]byte{intentSSTContents, resolveSSTContents} { | ||
| filename := fmt.Sprintf("intent-%d", i) | ||
| if err := db.WriteFile(filename, contents); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if err := db.IngestExternalFiles(ctx, []string{filename}, true); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| } | ||
|
|
||
| // We should now have a committed value at k@ts1. Read it back to make | ||
| // sure our fake intent resolution did the right thing. | ||
| if val, intents, err := engine.MVCCGet(ctx, db, k, ts1, true, nil); err != nil { | ||
| t.Fatal(err) | ||
| } else if len(intents) > 0 { | ||
| t.Fatalf("got unexpected intents: %v", intents) | ||
| } else if !val.EqualData(v) { | ||
| t.Fatalf("expected %s, got %s", v, val) | ||
| } | ||
|
|
||
| // Now the real test: a transaction at ts2 has been pushed to ts3 | ||
| // and must refresh. It overlaps with our committed intent on k@ts1, | ||
| // which is fine because our timestamp is higher (but if that intent | ||
| // were still pending, the new txn would be blocked). Prior to | ||
| // https://github.com/cockroachdb/cockroach/pull/32211, a bug in the | ||
| // time-bound iterator meant that we would see the first sstable but | ||
| // not the second and incorrectly report the intent as pending, | ||
| // resulting in an error from RefreshRange. | ||
| var resp roachpb.RefreshRangeResponse | ||
| _, err := RefreshRange(ctx, db, CommandArgs{ | ||
| Args: &roachpb.RefreshRangeRequest{ | ||
| RequestHeader: roachpb.RequestHeader{ | ||
| Key: k, | ||
| EndKey: keys.MaxKey, | ||
| }, | ||
| }, | ||
| Header: roachpb.Header{ | ||
| Txn: &roachpb.Transaction{ | ||
| TxnMeta: enginepb.TxnMeta{ | ||
| Timestamp: ts3, | ||
| }, | ||
| OrigTimestamp: ts2, | ||
| }, | ||
| }, | ||
| }, &resp) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| } |
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