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WritePrepared Txn: Add MultiGet to DB

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Summary:
This patch implements MultiGet API for WritePreparedTxnDB and update the existing unit tests.
Closes https://github.com/facebook/rocksdb/pull/3196

Differential Revision: D6401493

Pulled By: maysamyabandeh

fbshipit-source-id: 51501a1e32645fc2da8680e77a50035f6530f2cc
This commit is contained in:
Maysam Yabandeh 2017-11-27 08:49:30 -08:00 committed by Facebook Github Bot
parent f0dde49cda
commit b72b3c6f51
3 changed files with 50 additions and 0 deletions
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27
utilities/transactions/write_prepared_transaction_test.cc
View file

@ -305,6 +305,20 @@ class WritePreparedTransactionTest : public TransactionTest {
} else {
ASSERT_EQ(kv.second, "NOT_FOUND");
}
// Try with MultiGet API too
std::vector<std::string> values;
auto s_vec = db->MultiGet(read_options, {db->DefaultColumnFamily()},
{kv.first}, &values);
ASSERT_EQ(1, values.size());
ASSERT_EQ(1, s_vec.size());
s = s_vec[0];
ASSERT_TRUE(s.ok() || s.IsNotFound());
if (s.ok()) {
ASSERT_TRUE(kv.second == values[0]);
} else {
ASSERT_EQ(kv.second, "NOT_FOUND");
}
}
}
@ -1081,6 +1095,19 @@ void ASSERT_SAME(TransactionDB* db, Status exp_s, PinnableSlice& exp_v,
if (s.ok()) {
ASSERT_TRUE(exp_v == v);
}
// Try with MultiGet API too
std::vector<std::string> values;
auto s_vec =
db->MultiGet(roptions, {db->DefaultColumnFamily()}, {key}, &values);
ASSERT_EQ(1, values.size());
ASSERT_EQ(1, s_vec.size());
s = s_vec[0];
ASSERT_TRUE(exp_s == s);
ASSERT_TRUE(s.ok() || s.IsNotFound());
if (s.ok()) {
ASSERT_TRUE(exp_v == values[0]);
}
}
TEST_P(WritePreparedTransactionTest, RollbackTest) {

16
utilities/transactions/write_prepared_txn_db.cc
View file

@ -75,6 +75,22 @@ Status WritePreparedTxnDB::Get(const ReadOptions& options,
&callback);
}
std::vector<Status> WritePreparedTxnDB::MultiGet(
const ReadOptions& options,
const std::vector<ColumnFamilyHandle*>& column_family,
const std::vector<Slice>& keys, std::vector<std::string>* values) {
assert(values);
size_t num_keys = keys.size();
values->resize(num_keys);
std::vector<Status> stat_list(num_keys);
for (size_t i = 0; i < num_keys; ++i) {
std::string* value = values ? &(*values)[i] : nullptr;
stat_list[i] = this->Get(options, column_family[i], keys[i], value);
}
return stat_list;
}
// Struct to hold ownership of snapshot and read callback for iterator cleanup.
struct WritePreparedTxnDB::IteratorState {
IteratorState(WritePreparedTxnDB* txn_db, SequenceNumber sequence,

7
utilities/transactions/write_prepared_txn_db.h
View file

@ -72,6 +72,13 @@ class WritePreparedTxnDB : public PessimisticTransactionDB {
ColumnFamilyHandle* column_family, const Slice& key,
PinnableSlice* value) override;
using DB::MultiGet;
virtual std::vector<Status> MultiGet(
const ReadOptions& options,
const std::vector<ColumnFamilyHandle*>& column_family,
const std::vector<Slice>& keys,
std::vector<std::string>* values) override;
using DB::NewIterator;
virtual Iterator* NewIterator(const ReadOptions& options,
ColumnFamilyHandle* column_family) override;