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Reset DBIter::saved_key_ with proper user key anywhere before pass to DBIter::FindNextUserEntry

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Summary:
fix db_iter bug introduced by [facebook#1413](https://github.com/facebook/rocksdb/pull/1413)
Closes https://github.com/facebook/rocksdb/pull/1962

Differential Revision: D4672369

Pulled By: lightmark

fbshipit-source-id: 6a22953
This commit is contained in:
Aaron Gao 2017-03-08 17:12:04 -08:00 committed by Facebook Github Bot
parent c9df05d1e4
commit 12ba00ea65
2 changed files with 66 additions and 1 deletions
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7
db/db_iter.cc
View File

@ -341,6 +341,7 @@ void DBIter::Next() {
//
// NOTE: In between, saved_key_ can point to a user key that has
// a delete marker or a sequence number higher than sequence_
// saved_key_ MUST have a proper user_key before calling this function
//
// The prefix_check parameter controls whether we check the iterated
// keys against the prefix of the seeked key. Set to false when
@ -946,7 +947,6 @@ void DBIter::Seek(const Slice& target) {
StopWatch sw(env_, statistics_, DB_SEEK);
ReleaseTempPinnedData();
saved_key_.Clear();
// now saved_key is used to store internal key.
saved_key_.SetInternalKey(target, sequence_);
{
@ -961,6 +961,9 @@ void DBIter::Seek(const Slice& target) {
}
direction_ = kForward;
ClearSavedValue();
// convert the InternalKey to UserKey in saved_key_ before
// passed to FindNextUserEntry
saved_key_.Reserve(saved_key_.Size() - 8);
FindNextUserEntry(false /* not skipping */, prefix_same_as_start_);
if (!valid_) {
prefix_start_key_.clear();
@ -1039,6 +1042,8 @@ void DBIter::SeekToFirst() {
RecordTick(statistics_, NUMBER_DB_SEEK);
if (iter_->Valid()) {
saved_key_.SetKey(ExtractUserKey(iter_->key()),
!iter_->IsKeyPinned() || !pin_thru_lifetime_ /* copy */);
FindNextUserEntry(false /* not skipping */, false /* no prefix check */);
if (statistics_ != nullptr) {
if (valid_) {

60
db/db_iter_test.cc
View File

@ -1897,6 +1897,66 @@ TEST_F(DBIteratorTest, DBIterator12) {
ASSERT_FALSE(db_iter->Valid());
}
TEST_F(DBIteratorTest, DBIterator13) {
Options options;
options.merge_operator = nullptr;
std::string key;
key.resize(9);
key.assign(9, static_cast<char>(0));
key[0] = 'b';
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut(key, "0");
internal_iter->AddPut(key, "1");
internal_iter->AddPut(key, "2");
internal_iter->AddPut(key, "3");
internal_iter->AddPut(key, "4");
internal_iter->AddPut(key, "5");
internal_iter->AddPut(key, "6");
internal_iter->AddPut(key, "7");
internal_iter->AddPut(key, "8");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 2, 3, 0));
db_iter->Seek("b");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), key);
ASSERT_EQ(db_iter->value().ToString(), "2");
}
TEST_F(DBIteratorTest, DBIterator14) {
Options options;
options.merge_operator = nullptr;
std::string key("b");
TestIterator* internal_iter = new TestIterator(BytewiseComparator());
internal_iter->AddPut("b", "0");
internal_iter->AddPut("b", "1");
internal_iter->AddPut("b", "2");
internal_iter->AddPut("b", "3");
internal_iter->AddPut("a", "4");
internal_iter->AddPut("a", "5");
internal_iter->AddPut("a", "6");
internal_iter->AddPut("c", "7");
internal_iter->AddPut("c", "8");
internal_iter->AddPut("c", "9");
internal_iter->Finish();
std::unique_ptr<Iterator> db_iter(
NewDBIterator(env_, ImmutableCFOptions(options), BytewiseComparator(),
internal_iter, 4, 1, 0));
db_iter->Seek("b");
ASSERT_TRUE(db_iter->Valid());
ASSERT_EQ(db_iter->key().ToString(), "b");
ASSERT_EQ(db_iter->value().ToString(), "3");
db_iter->SeekToFirst();
ASSERT_EQ(db_iter->key().ToString(), "a");
ASSERT_EQ(db_iter->value().ToString(), "4");
}
class DBIterWithMergeIterTest : public testing::Test {
public:
DBIterWithMergeIterTest()