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Use MDB_APPEND mode where possible 

When keys are contiguous and monotonically increasing, this gets
denser page utilization (doesn't leave padding in page splits).
Can't be used for keys that are inserted in random order (e.g. hashes)
In total this only saves around 1.5% of space compared to original
DB code. The previous patch accounted for 0.8% savings on its own;
the blocks tables just aren't that big.
This commit is contained in:
Howard Chu 2016-01-07 13:23:12 +00:00
parent 090b548c3b
commit f2faf8cdd9
1 changed files with 9 additions and 5 deletions
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14
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -707,7 +707,7 @@ void BlockchainLMDB::add_output(const crypto::hash& tx_hash, const tx_out& tx_ou
MDB_val_copy<uint64_t> k(m_num_outputs); MDB_val_copy<uint64_t> k(m_num_outputs);
MDB_val_copy<crypto::hash> v(tx_hash); MDB_val_copy<crypto::hash> v(tx_hash);
result = mdb_cursor_put(m_cur_output_txs, &k, &v, 0); result = mdb_cursor_put(m_cur_output_txs, &k, &v, MDB_APPEND);
if (result) if (result)
throw0(DB_ERROR(std::string("Failed to add output tx hash to db transaction: ").append(mdb_strerror(result)).c_str())); throw0(DB_ERROR(std::string("Failed to add output tx hash to db transaction: ").append(mdb_strerror(result)).c_str()));
result = mdb_cursor_put(m_cur_tx_outputs, &v, &k, 0); result = mdb_cursor_put(m_cur_tx_outputs, &v, &k, 0);
@ -715,7 +715,7 @@ void BlockchainLMDB::add_output(const crypto::hash& tx_hash, const tx_out& tx_ou
throw0(DB_ERROR(std::string("Failed to add <tx hash, global output index> to db transaction: ").append(mdb_strerror(result)).c_str())); throw0(DB_ERROR(std::string("Failed to add <tx hash, global output index> to db transaction: ").append(mdb_strerror(result)).c_str()));
MDB_val_copy<uint64_t> val_local_index(local_index); MDB_val_copy<uint64_t> val_local_index(local_index);
result = mdb_cursor_put(m_cur_output_indices, &k, &val_local_index, 0); result = mdb_cursor_put(m_cur_output_indices, &k, &val_local_index, MDB_APPEND);
if (result) if (result)
throw0(DB_ERROR(std::string("Failed to add tx output index to db transaction: ").append(mdb_strerror(result)).c_str())); throw0(DB_ERROR(std::string("Failed to add tx output index to db transaction: ").append(mdb_strerror(result)).c_str()));
@ -733,7 +733,7 @@ void BlockchainLMDB::add_output(const crypto::hash& tx_hash, const tx_out& tx_ou
MDB_val_copy<output_data_t> data(od); MDB_val_copy<output_data_t> data(od);
//MDB_val_copy<crypto::public_key> val_pubkey(boost::get<txout_to_key>(tx_output.target).key); //MDB_val_copy<crypto::public_key> val_pubkey(boost::get<txout_to_key>(tx_output.target).key);
if (mdb_cursor_put(m_cur_output_keys, &k, &data, 0)) if (mdb_cursor_put(m_cur_output_keys, &k, &data, MDB_APPEND))
throw0(DB_ERROR("Failed to add output pubkey to db transaction")); throw0(DB_ERROR("Failed to add output pubkey to db transaction"));
} }
else else
@ -2615,7 +2615,7 @@ void BlockchainLMDB::set_hard_fork_starting_height(uint8_t version, uint64_t hei
MDB_val_copy<uint8_t> val_key(version); MDB_val_copy<uint8_t> val_key(version);
MDB_val_copy<uint64_t> val_value(height); MDB_val_copy<uint64_t> val_value(height);
if (auto result = mdb_put(*txn_ptr, m_hf_starting_heights, &val_key, &val_value, 0)) if (auto result = mdb_put(*txn_ptr, m_hf_starting_heights, &val_key, &val_value, MDB_APPEND))
throw1(DB_ERROR(std::string("Error adding hard fork starting height to db transaction: ").append(mdb_strerror(result)).c_str())); throw1(DB_ERROR(std::string("Error adding hard fork starting height to db transaction: ").append(mdb_strerror(result)).c_str()));
TXN_BLOCK_POSTFIX_SUCCESS(); TXN_BLOCK_POSTFIX_SUCCESS();
@ -2650,7 +2650,11 @@ void BlockchainLMDB::set_hard_fork_version(uint64_t height, uint8_t version)
MDB_val_copy<uint64_t> val_key(height); MDB_val_copy<uint64_t> val_key(height);
MDB_val_copy<uint8_t> val_value(version); MDB_val_copy<uint8_t> val_value(version);
if (auto result = mdb_put(*txn_ptr, m_hf_versions, &val_key, &val_value, 0)) int result;
result = mdb_put(*txn_ptr, m_hf_versions, &val_key, &val_value, MDB_APPEND);
if (result == MDB_KEYEXIST)
result = mdb_put(*txn_ptr, m_hf_versions, &val_key, &val_value, 0);
if (result)
throw1(DB_ERROR(std::string("Error adding hard fork version to db transaction: ").append(mdb_strerror(result)).c_str())); throw1(DB_ERROR(std::string("Error adding hard fork version to db transaction: ").append(mdb_strerror(result)).c_str()));
TXN_BLOCK_POSTFIX_SUCCESS(); TXN_BLOCK_POSTFIX_SUCCESS();