Apache Doris 2.1 just got a major speed boost with Arrow Flight SQL for up to 10x faster data transfers.
For years, JDBC and ODBC have been commonly adopted norms for database interaction. Now, as we gaze upon the vast expanse of the data realm, the rise of data science and data lake analytics brings bigger and bigger datasets.
Correspondingly, we need faster data reading and transmission, so we have started to look for better answers than JDBC and ODBC. Thus, we include the Arrow Flight SQL protocol into Apache Doris 2.1, which provides tens-fold speedups for data transfer. https://www.youtube.com/watch?v=zIqy24gI8DE&embedable=true High-speed data transfer based on Arrow Flight SQL As a column-oriented data warehouse, Apache Doris arranges its query results in the form of data Blocks in a columnar format. Before version 2.1, the Blocks must be serialized into bytes in row-oriented formats before they can be transferred to a target client via a MySQL client or JDBC/ODBC driver. Moreover, if the target client is a columnar database or a column-oriented data science component like Pandas, the data should then be de-serialized. The serialization-deserialization process is a speed bump for data transmission. Apache Doris 2.1 has a data transmission channel built on Arrow Flight SQL. It allows high-speed, large-scale data reading from Doris via SQL in various mainstream programming languages. For target clients that also support the Arrow format, the whole process will be free of serialization/deserialization, thus resulting in no performance loss. Another upside is that Arrow Flight can make full use of multi-node and multi-core architecture and implement parallel data transfer, which is another enabler of high data throughput. For example, if a Python client reads data from Apache Doris, Doris will first convert the column-oriented Blocks to Arrow RecordBatch. Then in the Python client, Arrow RecordBatch will be converted to Pandas DataFrame. Both conversions are fast because the Doris Blocks, Arrow RecordBatch, and Pandas DataFrame are all column-oriented. In addition, Arrow Flight SQL provides a general JDBC driver to facilitate seamless communication between databases that supports the Arrow Flight SQL protocol. This unlocks the the potential of Doris to be connected to a wider ecosystem and to be used in more cases. Performance test The "tens-fold speedups" conclusion is based on our benchmark tests. We tried reading data from Doris using PyMySQL, Pandas, and Arrow Flight SQL and jotted down the durations, respectively. The test data is the ClickBench dataset. Results on various data types are as follows: As shown, Arrow Flight SQL outperforms PyMySQL and Pandas in all data types by a factor ranging from 20 to several hundreds. Usage With support for Arrow Flight SQL, Apache Doris can leverage the Python ADBC Driver for fast data reading. I will showcase a few frequently executed database operations using the Python ADBC Driver , including DDL, DML, session variable setting, and show statements. 01 Install library The relevant library is already published on PyPI. It can be installed simply as follows: pip install adbc_driver_manager pip install adbc_driver_flightsql Import the following module/library to interact with the installed library: import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql 02 Connect to Doris Create a client to interact with the Doris Arrow Flight SQL service. Prerequisites include Doris frontend host, Arrow Flight port, and login username/password. Configure parameters for Doris frontend and backend : In fe/conf/fe.conf, set arrow_flight_sql_port to an available port, such as 9090. In be/conf/be.conf, set arrow_flight_port to an available port, such as 9091. Suppose that the Arrow Flight SQL services for the Doris instance will run on ports 9090 and 9091 for FE and BE, respectively, and the Doris username/password is "user" and "pass", the connection process would be: conn=flight_sql.connect cursor=conn.cursor Once the connection is established, you can interact with Doris using SQL statements through the returned cursor object. This allows you to perform various operations such as table creation, metadata retrieval, data import, and query execution. 03 Create table and retrieve metadata Pass the query to the cursor.execute function, which creates tables and retrieves metadata. cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute NULL DEFAULT "" COMMENT "", k3 DECIMAL DEFAULT "0", k4 BIGINT NULL DEFAULT '10', k5 DATE, ) DISTRIBUTED BY HASH BUCKETS 5 PROPERTIES;""") print.to_pandas) cursor.execute print.to_pandas) If the returned StatusResult is 0, which means the query is executed successfully. StatusResult 0 0 StatusResult 0 0 Database 0 __internal_schema 1 arrow_flight_sql .. ... 507 udf_auth_db StatusResult 0 0 StatusResult 0 0 Table Create Table 0 arrow_flight_sql_test CREATE TABLE `arrow_flight_sql_test` , , , , ;""") print.to_pandas) If you see the following returned result, the data ingestion is successful. StatusResult 0 0 If the data size to ingest is huge, you can apply the Stream Load method using pydoris. 05 Execute queries Perform queries on the above table, such as aggregation, sorting, and session variable setting. cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute, count, avg from arrow_flight_sql_test group by k5;") print.to_pandas) The results are as follows: k0 k1 K2 k3 k4 k5 0 0 0.10000 ID 0.000100000 9999999999 2023-10-21 1 1 0.20000 ID_1 1.000000010 0 2023-10-21 2 2 3.40000 ID_1 3.100000000 123456 2023-10-22 3 3 4.00000 ID 4.000000000 4 2023-10-22 4 4 122345.54321 ID 122345.543210000 5 2023-10-22 StatusResult 0 0 Variable_name Value Default_Value Changed 0 exec_mem_limit 2000 2147483648 1 k5 Nullable_1 Int64_2 Nullable)_3 0 2023-10-22 122352.94321 3 40784.214403333 1 2023-10-21 0.30000 2 0.500050005 06 Complete code # Doris Arrow Flight SQL Test # step 1, library is released on PyPI and can be easily installed. # pip install adbc_driver_manager # pip install adbc_driver_flightsql import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql # step 2, create a client that interacts with the Doris Arrow Flight SQL service. # Modify arrow_flight_sql_port in fe/conf/fe.conf to an available port, such as 9090. # Modify arrow_flight_port in be/conf/be.conf to an available port, such as 9091. conn=flight_sql.connect cursor=conn.cursor # interacting with Doris via SQL using Cursor def execute: print cursor.execute print print.to_pandas) # step3, execute DDL statements, create database/table, show stmt. execute execute execute execute execute execute NULL DEFAULT "" COMMENT "", k3 DECIMAL DEFAULT "0", k4 BIGINT NULL DEFAULT '10', k5 DATE, ) DISTRIBUTED BY HASH BUCKETS 5 PROPERTIES;""") execute # step4, insert into execute, , , , ;""") # step5, execute queries, aggregation, sort, set session variable execute execute execute execute, count, avg from arrow_flight_sql_test group by k5;") # step6, close cursor cursor.close Examples of data transmission at scale 01 Python In Python, after connecting to Doris using the ADBC Driver, you can use various ADBC APIs to load the Clickbench dataset from Doris into Python. Here's how: #!/usr/bin/env python # -*- coding: utf-8 -*- import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql import pandas from datetime import datetime my_uri="grpc://0.0.0.0:`fe.conf_arrow_flight_port`" my_db_kwargs={ adbc_driver_manager.DatabaseOptions.USERNAME.value: "root", adbc_driver_manager.DatabaseOptions.PASSWORD.value: "", } sql="select * from clickbench.hits limit 1000000;" # PEP 249 API wrapper for the ADBC Driver Manager. def dbapi_adbc_execute_fetchallarrow: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now cursor.execute arrow_data=cursor.fetchallarrow dataframe=arrow_data.to_pandas print - start_time) + ", bytes:" + str + ", len:" + str)) print) print # ADBC reads data into pandas dataframe, which is faster than fetchallarrow first and then to_pandas. def dbapi_adbc_execute_fetch_df: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now cursor.execute dataframe=cursor.fetch_df print - start_time)) print) print # Can read multiple partitions in parallel. def dbapi_adbc_execute_partitions: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now partitions, schema=cursor.adbc_execute_partitions cursor.adbc_read_partition arrow_data=cursor.fetchallarrow dataframe=arrow_data.to_pandas print - start_time) + ", len:" + str)) print) print dbapi_adbc_execute_fetchallarrow dbapi_adbc_execute_fetch_df dbapi_adbc_execute_partitions Results are as follows . It only takes 3s to load a Clickbench dataset containing 1 million rows and 105 columns. ## dbapi_adbc_execute_fetchallarrow, cost:0:00:03.548080, bytes:784372793, len:1000000 RangeIndex: 1000000 entries, 0 to 999999 Columns: 105 entries, CounterID to CLID dtypes: int16, int32, int64, object memory usage: 2.4 GB None CounterID EventDate UserID EventTime WatchID JavaEnable Title GoodEvent ... UTMCampaign UTMContent UTMTerm FromTag HasGCLID RefererHash URLHash CLID 0 245620 2013-07-09 2178958239546411410 2013-07-09 19:30:27 8302242799508478680 1 OWAProfessionov — Мой Круг :1 ## low_level_api_execute_query, cost:0:00:03.523598, stream.address:139992182177600, rows:-1, bytes:784322926, len:1000000 ## low_level_api_execute_partitions, cost:0:00:03.738128streams.size:3, 1, -1 02 JDBC The open-source JDBC driver for the Arrow Flight SQL protocol provides compatibility with the standard JDBC API. It allows most BI tools to access Doris via JDBC and supports high-speed transfer of Apache Arrow data. Usage of this driver is similar to using that for the MySQL protocol. You just need to replace jdbc:mysql in the connection URL with jdbc:arrow-flight-sql. The returned result will be in the JDBC ResultSet data structure. import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; Class.forName; String DB_URL="jdbc:arrow-flight-sql://0.0.0.0:9090?useServerPrepStmts=false" + "&cachePrepStmts=true&useSSL=false&useEncryption=false"; String USER="root"; String PASS=""; Connection conn=DriverManager.getConnection; Statement stmt=conn.createStatement; ResultSet resultSet=stmt.executeQuery; while ) { String col1=resultSet.getString; System.out.println; } resultSet.close; stmt.close; conn.close; 03 JAVA Similar to that with Python, you can directly create an ADBC client with JAVA to read data from Doris. Firstly, you need to obtain the FlightInfo. Then, you connect to each endpoint to pull the data. // method one AdbcStatement stmt=connection.createStatement stmt.setSqlQuery // executeQuery, two steps: // 1. Execute Query and get returned FlightInfo; // 2. Create FlightInfoReader to sequentially traverse each Endpoint; QueryResult queryResult=stmt.executeQuery // method two AdbcStatement stmt=connection.createStatement stmt.setSqlQuery // Execute Query and parse each Endpoint in FlightInfo, and use the Location and Ticket to construct a PartitionDescriptor partitionResult=stmt.executePartitioned; partitionResult.getPartitionDescriptors //Create ArrowReader for each PartitionDescriptor to read data ArrowReader reader=connection2.readPartition.get.getDescriptor)) 04 Spark For Spark users, apart from connecting to Flight SQL Server using JDBC and JAVA, you can apply the Spark-Flight-Connector, which enables Spark to act as a client for reading and writing data from/to a Flight SQL Server. This is made possible by the fast data conversion between the Arrow format and the Block in Apache Doris, which is 10 times faster than the conversion between CSV and Block. Moreover, the Arrow data format provides more comprehensive and robust support for complex data types such as Map and Array. Hop on the trend train A number of enterprise users of Doris have tried loading data from Doris to Python, Spark, and Flink using Arrow Flight SQL and enjoyed much faster data reading speed. In the future, we plan to include support for Arrow Flight SQL in data writing, too. By then, most systems built with mainstream programming languages will be able to read and write data from/to Apache Doris by an ADBC client. That's high-speed data interaction, which opens up numerous possibilities. On our to-do list, we also envision leveraging Arrow Flight to implement parallel data reading by multiple backends and facilitate federated queries across Doris and Spark. Download Apache Doris 2.1 and get a taste of 100 times faster data transfer powered by Arrow Flight SQL. If you need assistance, come find us in the Apache Doris developer and user community. Correspondingly, we need faster data reading and transmission, so we have started to look for better answers than JDBC and ODBC. Thus, we include the Arrow Flight SQL protocol into Apache Doris 2.1 , which provides tens-fold speedups for data transfer . Arrow Flight SQL protocol Apache Doris 2.1 tens-fold speedups for data transfer https://www.youtube.com/watch?v=zIqy24gI8DE&embedable=true https://www.youtube.com/watch?v=zIqy24gI8DE&embedable=true High-speed data transfer based on Arrow Flight SQL As a column-oriented data warehouse, Apache Doris arranges its query results in the form of data Blocks in a columnar format. Before version 2.1, the Blocks must be serialized into bytes in row-oriented formats before they can be transferred to a target client via a MySQL client or JDBC/ODBC driver. Moreover, if the target client is a columnar database or a column-oriented data science component like Pandas, the data should then be de-serialized. The serialization-deserialization process is a speed bump for data transmission. Apache Doris 2.1 has a data transmission channel built on Arrow Flight SQL . It allows high-speed, large-scale data reading from Doris via SQL in various mainstream programming languages . For target clients that also support the Arrow format, the whole process will be free of serialization/deserialization, thus resulting in no performance loss. Another upside is that Arrow Flight can make full use of multi-node and multi-core architecture and implement parallel data transfer, which is another enabler of high data throughput. Arrow Flight SQL Apache Arrow high-speed, large-scale data reading from Doris via SQL in various mainstream programming languages For example, if a Python client reads data from Apache Doris, Doris will first convert the column-oriented Blocks to Arrow RecordBatch. Then in the Python client, Arrow RecordBatch will be converted to Pandas DataFrame. Both conversions are fast because the Doris Blocks, Arrow RecordBatch, and Pandas DataFrame are all column-oriented. In addition, Arrow Flight SQL provides a general JDBC driver to facilitate seamless communication between databases that supports the Arrow Flight SQL protocol. This unlocks the the potential of Doris to be connected to a wider ecosystem and to be used in more cases. Performance test The "tens-fold speedups" conclusion is based on our benchmark tests. We tried reading data from Doris using PyMySQL, Pandas, and Arrow Flight SQL and jotted down the durations, respectively. The test data is the ClickBench dataset. Results on various data types are as follows: As shown, Arrow Flight SQL outperforms PyMySQL and Pandas in all data types by a factor ranging from 20 to several hundreds . As shown, Arrow Flight SQL outperforms PyMySQL and Pandas in all data types by a factor ranging from 20 to several hundreds Usage With support for Arrow Flight SQL, Apache Doris can leverage the Python ADBC Driver for fast data reading. I will showcase a few frequently executed database operations using the Python ADBC Driver , including DDL, DML, session variable setting, and show statements. show 01 Install library The relevant library is already published on PyPI. It can be installed simply as follows: pip install adbc_driver_manager pip install adbc_driver_flightsql pip install adbc_driver_manager pip install adbc_driver_flightsql Import the following module/library to interact with the installed library: import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql 02 Connect to Doris Create a client to interact with the Doris Arrow Flight SQL service. Prerequisites include Doris frontend host, Arrow Flight port, and login username/password. Configure parameters for Doris frontend and backend : In fe/conf/fe.conf, set arrow_flight_sql_port to an available port, such as 9090. In be/conf/be.conf, set arrow_flight_port to an available port, such as 9091. In fe/conf/fe.conf , set arrow_flight_sql_port to an available port, such as 9090. fe/conf/fe.conf arrow_flight_sql_port In be/conf/be.conf , set arrow_flight_port to an available port, such as 9091. be/conf/be.conf arrow_flight_port Suppose that the Arrow Flight SQL services for the Doris instance will run on ports 9090 and 9091 for FE and BE, respectively, and the Doris username/password is "user" and "pass", the connection process would be: conn=flight_sql.connect cursor=conn.cursor conn=flight_sql.connect cursor=conn.cursor Once the connection is established, you can interact with Doris using SQL statements through the returned cursor object. This allows you to perform various operations such as table creation, metadata retrieval, data import, and query execution. 03 Create table and retrieve metadata Pass the query to the cursor.execute function, which creates tables and retrieves metadata. cursor.execute cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute NULL DEFAULT "" COMMENT "", k3 DECIMAL DEFAULT "0", k4 BIGINT NULL DEFAULT '10', k5 DATE, ) DISTRIBUTED BY HASH BUCKETS 5 PROPERTIES;""") print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute NULL DEFAULT "" COMMENT "", k3 DECIMAL DEFAULT "0", k4 BIGINT NULL DEFAULT '10', k5 DATE, ) DISTRIBUTED BY HASH BUCKETS 5 PROPERTIES;""") print.to_pandas) cursor.execute print.to_pandas) If the returned StatusResult is 0, which means the query is executed successfully. StatusResult StatusResult 0 0 StatusResult 0 0 Database 0 __internal_schema 1 arrow_flight_sql .. ... 507 udf_auth_db StatusResult 0 0 StatusResult 0 0 Table Create Table 0 arrow_flight_sql_test CREATE TABLE `arrow_flight_sql_test` , , , , ;""") print.to_pandas) cursor.execute, , , , ;""") print.to_pandas) If you see the following returned result, the data ingestion is successful. StatusResult 0 0 StatusResult 0 0 If the data size to ingest is huge, you can apply the Stream Load method using pydoris . pydoris 05 Execute queries Perform queries on the above table, such as aggregation, sorting, and session variable setting. cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute, count, avg from arrow_flight_sql_test group by k5;") print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute print.to_pandas) cursor.execute, count, avg from arrow_flight_sql_test group by k5;") print.to_pandas) The results are as follows: k0 k1 K2 k3 k4 k5 0 0 0.10000 ID 0.000100000 9999999999 2023-10-21 1 1 0.20000 ID_1 1.000000010 0 2023-10-21 2 2 3.40000 ID_1 3.100000000 123456 2023-10-22 3 3 4.00000 ID 4.000000000 4 2023-10-22 4 4 122345.54321 ID 122345.543210000 5 2023-10-22 StatusResult 0 0 Variable_name Value Default_Value Changed 0 exec_mem_limit 2000 2147483648 1 k5 Nullable_1 Int64_2 Nullable)_3 0 2023-10-22 122352.94321 3 40784.214403333 1 2023-10-21 0.30000 2 0.500050005 k0 k1 K2 k3 k4 k5 0 0 0.10000 ID 0.000100000 9999999999 2023-10-21 1 1 0.20000 ID_1 1.000000010 0 2023-10-21 2 2 3.40000 ID_1 3.100000000 123456 2023-10-22 3 3 4.00000 ID 4.000000000 4 2023-10-22 4 4 122345.54321 ID 122345.543210000 5 2023-10-22 StatusResult 0 0 Variable_name Value Default_Value Changed 0 exec_mem_limit 2000 2147483648 1 k5 Nullable_1 Int64_2 Nullable)_3 0 2023-10-22 122352.94321 3 40784.214403333 1 2023-10-21 0.30000 2 0.500050005 06 Complete code # Doris Arrow Flight SQL Test # step 1, library is released on PyPI and can be easily installed. # pip install adbc_driver_manager # pip install adbc_driver_flightsql import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql # step 2, create a client that interacts with the Doris Arrow Flight SQL service. # Modify arrow_flight_sql_port in fe/conf/fe.conf to an available port, such as 9090. # Modify arrow_flight_port in be/conf/be.conf to an available port, such as 9091. conn=flight_sql.connect cursor=conn.cursor # interacting with Doris via SQL using Cursor def execute: print cursor.execute print print.to_pandas) # step3, execute DDL statements, create database/table, show stmt. execute execute execute execute execute execute NULL DEFAULT "" COMMENT "", k3 DECIMAL DEFAULT "0", k4 BIGINT NULL DEFAULT '10', k5 DATE, ) DISTRIBUTED BY HASH BUCKETS 5 PROPERTIES;""") execute # step4, insert into execute, , , , ;""") # step5, execute queries, aggregation, sort, set session variable execute execute execute execute, count, avg from arrow_flight_sql_test group by k5;") # step6, close cursor cursor.close # Doris Arrow Flight SQL Test # step 1, library is released on PyPI and can be easily installed. # pip install adbc_driver_manager # pip install adbc_driver_flightsql import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql # step 2, create a client that interacts with the Doris Arrow Flight SQL service. # Modify arrow_flight_sql_port in fe/conf/fe.conf to an available port, such as 9090. # Modify arrow_flight_port in be/conf/be.conf to an available port, such as 9091. conn=flight_sql.connect cursor=conn.cursor # interacting with Doris via SQL using Cursor def execute: print cursor.execute print print.to_pandas) # step3, execute DDL statements, create database/table, show stmt. execute execute execute execute execute execute NULL DEFAULT "" COMMENT "", k3 DECIMAL DEFAULT "0", k4 BIGINT NULL DEFAULT '10', k5 DATE, ) DISTRIBUTED BY HASH BUCKETS 5 PROPERTIES;""") execute # step4, insert into execute, , , , ;""") # step5, execute queries, aggregation, sort, set session variable execute execute execute execute, count, avg from arrow_flight_sql_test group by k5;") # step6, close cursor cursor.close Examples of data transmission at scale 01 Python In Python, after connecting to Doris using the ADBC Driver, you can use various ADBC APIs to load the Clickbench dataset from Doris into Python. Here's how: #!/usr/bin/env python # -*- coding: utf-8 -*- import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql import pandas from datetime import datetime my_uri="grpc://0.0.0.0:`fe.conf_arrow_flight_port`" my_db_kwargs={ adbc_driver_manager.DatabaseOptions.USERNAME.value: "root", adbc_driver_manager.DatabaseOptions.PASSWORD.value: "", } sql="select * from clickbench.hits limit 1000000;" # PEP 249 API wrapper for the ADBC Driver Manager. def dbapi_adbc_execute_fetchallarrow: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now cursor.execute arrow_data=cursor.fetchallarrow dataframe=arrow_data.to_pandas print - start_time) + ", bytes:" + str + ", len:" + str)) print) print # ADBC reads data into pandas dataframe, which is faster than fetchallarrow first and then to_pandas. def dbapi_adbc_execute_fetch_df: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now cursor.execute dataframe=cursor.fetch_df print - start_time)) print) print # Can read multiple partitions in parallel. def dbapi_adbc_execute_partitions: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now partitions, schema=cursor.adbc_execute_partitions cursor.adbc_read_partition arrow_data=cursor.fetchallarrow dataframe=arrow_data.to_pandas print - start_time) + ", len:" + str)) print) print dbapi_adbc_execute_fetchallarrow dbapi_adbc_execute_fetch_df dbapi_adbc_execute_partitions #!/usr/bin/env python # -*- coding: utf-8 -*- import adbc_driver_manager import adbc_driver_flightsql.dbapi as flight_sql import pandas from datetime import datetime my_uri="grpc://0.0.0.0:`fe.conf_arrow_flight_port`" my_db_kwargs={ adbc_driver_manager.DatabaseOptions.USERNAME.value: "root", adbc_driver_manager.DatabaseOptions.PASSWORD.value: "", } sql="select * from clickbench.hits limit 1000000;" # PEP 249 API wrapper for the ADBC Driver Manager. def dbapi_adbc_execute_fetchallarrow: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now cursor.execute arrow_data=cursor.fetchallarrow dataframe=arrow_data.to_pandas print - start_time) + ", bytes:" + str + ", len:" + str)) print) print # ADBC reads data into pandas dataframe, which is faster than fetchallarrow first and then to_pandas. def dbapi_adbc_execute_fetch_df: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now cursor.execute dataframe=cursor.fetch_df print - start_time)) print) print # Can read multiple partitions in parallel. def dbapi_adbc_execute_partitions: conn=flight_sql.connect cursor=conn.cursor start_time=datetime.now partitions, schema=cursor.adbc_execute_partitions cursor.adbc_read_partition arrow_data=cursor.fetchallarrow dataframe=arrow_data.to_pandas print - start_time) + ", len:" + str)) print) print dbapi_adbc_execute_fetchallarrow dbapi_adbc_execute_fetch_df dbapi_adbc_execute_partitions Results are as follows . It only takes 3s to load a Clickbench dataset containing 1 million rows and 105 columns. It only takes 3s ## dbapi_adbc_execute_fetchallarrow, cost:0:00:03.548080, bytes:784372793, len:1000000 RangeIndex: 1000000 entries, 0 to 999999 Columns: 105 entries, CounterID to CLID dtypes: int16, int32, int64, object memory usage: 2.4 GB None CounterID EventDate UserID EventTime WatchID JavaEnable Title GoodEvent ... UTMCampaign UTMContent UTMTerm FromTag HasGCLID RefererHash URLHash CLID 0 245620 2013-07-09 2178958239546411410 2013-07-09 19:30:27 8302242799508478680 1 OWAProfessionov — Мой Круг :1 ## low_level_api_execute_query, cost:0:00:03.523598, stream.address:139992182177600, rows:-1, bytes:784322926, len:1000000 ## low_level_api_execute_partitions, cost:0:00:03.738128streams.size:3, 1, -1 ## dbapi_adbc_execute_fetchallarrow, cost:0:00:03.548080, bytes:784372793, len:1000000 RangeIndex: 1000000 entries, 0 to 999999 Columns: 105 entries, CounterID to CLID dtypes: int16, int32, int64, object memory usage: 2.4 GB None CounterID EventDate UserID EventTime WatchID JavaEnable Title GoodEvent ... UTMCampaign UTMContent UTMTerm FromTag HasGCLID RefererHash URLHash CLID 0 245620 2013-07-09 2178958239546411410 2013-07-09 19:30:27 8302242799508478680 1 OWAProfessionov — Мой Круг :1 ## low_level_api_execute_query, cost:0:00:03.523598, stream.address:139992182177600, rows:-1, bytes:784322926, len:1000000 ## low_level_api_execute_partitions, cost:0:00:03.738128streams.size:3, 1, -1 02 JDBC The open-source JDBC driver for the Arrow Flight SQL protocol provides compatibility with the standard JDBC API. It allows most BI tools to access Doris via JDBC and supports high-speed transfer of Apache Arrow data. Usage of this driver is similar to using that for the MySQL protocol. You just need to replace jdbc:mysql in the connection URL with jdbc:arrow-flight-sql . The returned result will be in the JDBC ResultSet data structure. jdbc:mysql jdbc:arrow-flight-sql import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; Class.forName; String DB_URL="jdbc:arrow-flight-sql://0.0.0.0:9090?useServerPrepStmts=false" + "&cachePrepStmts=true&useSSL=false&useEncryption=false"; String USER="root"; String PASS=""; Connection conn=DriverManager.getConnection; Statement stmt=conn.createStatement; ResultSet resultSet=stmt.executeQuery; while ) { String col1=resultSet.getString; System.out.println; } resultSet.close; stmt.close; conn.close; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; Class.forName; String DB_URL="jdbc:arrow-flight-sql://0.0.0.0:9090?useServerPrepStmts=false" + "&cachePrepStmts=true&useSSL=false&useEncryption=false"; String USER="root"; String PASS=""; Connection conn=DriverManager.getConnection; Statement stmt=conn.createStatement; ResultSet resultSet=stmt.executeQuery; while ) { String col1=resultSet.getString; System.out.println; } resultSet.close; stmt.close; conn.close; 03 JAVA Similar to that with Python, you can directly create an ADBC client with JAVA to read data from Doris. Firstly, you need to obtain the FlightInfo. Then, you connect to each endpoint to pull the data. // method one AdbcStatement stmt=connection.createStatement stmt.setSqlQuery // executeQuery, two steps: // 1. Execute Query and get returned FlightInfo; // 2. Create FlightInfoReader to sequentially traverse each Endpoint; QueryResult queryResult=stmt.executeQuery // method two AdbcStatement stmt=connection.createStatement stmt.setSqlQuery // Execute Query and parse each Endpoint in FlightInfo, and use the Location and Ticket to construct a PartitionDescriptor partitionResult=stmt.executePartitioned; partitionResult.getPartitionDescriptors //Create ArrowReader for each PartitionDescriptor to read data ArrowReader reader=connection2.readPartition.get.getDescriptor)) // method one AdbcStatement stmt=connection.createStatement stmt.setSqlQuery // executeQuery, two steps: // 1. Execute Query and get returned FlightInfo; // 2. Create FlightInfoReader to sequentially traverse each Endpoint; QueryResult queryResult=stmt.executeQuery // method two AdbcStatement stmt=connection.createStatement stmt.setSqlQuery // Execute Query and parse each Endpoint in FlightInfo, and use the Location and Ticket to construct a PartitionDescriptor partitionResult=stmt.executePartitioned; partitionResult.getPartitionDescriptors //Create ArrowReader for each PartitionDescriptor to read data ArrowReader reader=connection2.readPartition.get.getDescriptor)) 04 Spark For Spark users, apart from connecting to Flight SQL Server using JDBC and JAVA, you can apply the Spark-Flight-Connector , which enables Spark to act as a client for reading and writing data from/to a Flight SQL Server. This is made possible by the fast data conversion between the Arrow format and the Block in Apache Doris, which is 10 times faster than the conversion between CSV and Block . Moreover, the Arrow data format provides more comprehensive and robust support for complex data types such as Map and Array. Spark-Flight-Connector 10 times faster than the conversion between CSV and Block Hop on the trend train A number of enterprise users of Doris have tried loading data from Doris to Python, Spark, and Flink using Arrow Flight SQL and enjoyed much faster data reading speed. In the future, we plan to include support for Arrow Flight SQL in data writing, too. By then, most systems built with mainstream programming languages will be able to read and write data from/to Apache Doris by an ADBC client. That's high-speed data interaction, which opens up numerous possibilities. On our to-do list, we also envision leveraging Arrow Flight to implement parallel data reading by multiple backends and facilitate federated queries across Doris and Spark. Download Apache Doris 2.1 and get a taste of 100 times faster data transfer powered by Arrow Flight SQL. If you need assistance, come find us in the Apache Doris developer and user community . Apache Doris 2.1 Apache Doris developer and user community
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