Connection pool size with postgres r2dbc-pool

问题

I'm not able to open more than 10 connections with spring-webflux and r2dbc (with r2dbc-pool driver 0.8.0.M8). My config looks like:

@Configuration
public class PostgresConfig extends AbstractR2dbcConfiguration {

  @Override
  @Bean
  public ConnectionFactory connectionFactory() {
    ConnectionFactory connectionFactory = ConnectionFactories.get(ConnectionFactoryOptions.builder()
        .option(DRIVER, "pool")
        .option(PROTOCOL, "postgresql")
        .option(HOST, host)
        .option(USER, user)
        .option(PASSWORD, password)
        .option(DATABASE, database)
        .build());
    ConnectionPoolConfiguration configuration = ConnectionPoolConfiguration.builder(connectionFactory)
        .maxIdleTime(Duration.ofMinutes(30))
        .initialSize(initialSize)
        .maxSize(maxSize)
        .maxCreateConnectionTime(Duration.ofSeconds(1))
        .build();
    return new ConnectionPool(configuration);
  }
}

When I'm specifying more than 10 connections I get errors like:

org.springframework.dao.DataAccessResourceFailureException: 
Failed to obtain R2DBC Connection; nested exception is 
java.util.concurrent.TimeoutException: 
Did not observe any item or terminal signal within 1000ms in 'lift' 
(and no fallback has been configured)
    at org.springframework.data.r2dbc.connectionfactory.ConnectionFactoryUtils
    .lambda$getConnection$0(ConnectionFactoryUtils.java:71)

Moreover, number of connections remain the same as initial size. New connections are not created.

回答1:

Ok, the MAX_SIZE should be also specified for ConnectionFactoryOptions. Otherwise connection pool size still remains 10.

import static io.r2dbc.pool.PoolingConnectionFactoryProvider.MAX_SIZE;

    ConnectionFactory connectionFactory = ConnectionFactories.get(ConnectionFactoryOptions.builder()
        .option(DRIVER, "pool")
        .option(PROTOCOL, "postgresql")
        .option(HOST, host)
        .option(USER, user)
        .option(PASSWORD, password)
        .option(DATABASE, database)
        .option(MAX_SIZE, maxSize)
        .build());

来源：https://stackoverflow.com/questions/57971278/connection-pool-size-with-postgres-r2dbc-pool

标签

java

spring-webflux

r2dbc