connection-pooling

问题 Having a spout which on each tick goes to Postgre database and reads an additional row. The spout code looks as follows: class RawDataLevelSpout extends BaseRichSpout implements Serializable { private int counter; SpoutOutputCollector collector; @Override public void declareOutputFields(OutputFieldsDeclarer declarer) { declarer.declare(new Fields("col1", "col2")); } @Override public void open(Map map, TopologyContext context, SpoutOutputCollector spoutOutputCollector) { collector =

问题 org.apache.http.impl.conn.PoolingHttpClientConnectionManager org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager What is the difference between these two types? Which one is more reliable in a multithreaded environment? Thanks 回答1: What is the difference between these two types? PoolingHttpClientConnectionManager maintains a pool of HttpClientConnections, which provides synchronous/blocking communication. PoolingNHttpClientConnectionManager maintains a pool of

问题 I'm trying to use HikariCP JDBC connection pool in my Java application. I'm not using any frameworks like Spring or Hibernate in my application. Currently I'm able to connect to MySQL DB using simple JDBC driver but when I try using Hiraki the code is not working. Can't understand where I'm going wrong even after initializing the data source . Initial JDBC Working Code.. public class Connect extends ErrorCat{ protected Connection connection = null; //Database user name and password private

问题 I'm trying to use HikariCP JDBC connection pool in my Java application. I'm not using any frameworks like Spring or Hibernate in my application. Currently I'm able to connect to MySQL DB using simple JDBC driver but when I try using Hiraki the code is not working. Can't understand where I'm going wrong even after initializing the data source . Initial JDBC Working Code.. public class Connect extends ErrorCat{ protected Connection connection = null; //Database user name and password private

问题 So I was looking into the c3p0 API to debug one of our production issues which was resulting in a stack overflow error while checking out a connection. I found below comments in BasicResourcePool class's checkoutResource method: /* * This function recursively calls itself... under nonpathological * situations, it shouldn't be a problem, but if resources can never * successfully check out for some reason, we might blow the stack... * * by the semantics of wait(), a timeout of zero means

问题 Below is the complete code simplified for the question. ids_to_check returns a list of ids. For my testing, I used a list of 13 random strings. #!/usr/bin/env python3 import time from multiprocessing.dummy import Pool as ThreadPool, current_process as threadpool_process import requests def ids_to_check(): some_calls() return(id_list) def execute_task(id): url = f"https://myserver.com/todos/{ id }" json_op = s.get(url,verify=False).json() value = json_op['id'] print(str(value) + '-' + str

问题 I want to setup a connection pool for a Oracle DB in a Helper class. public class DbConnection { // Data source for the pooled connection private static OracleDataSource dataSource; // Host private static final String dbHost = "bla"; // Port private static final String dbPort = "1521"; // DBname private static final String database = "orcl"; // DBuser private static final String dbUser = "bla"; // DBpassword private static final String dbPassword = "bla"; static {

问题 I am calling REST service and one of the APIs fail intermittently, I had looked for the answer, but did not find anything significant. Below is the stacktrace. org.springframework.web.client.ResourceAccessException: I/O error on POST request for "https://api.blahblah.com/v2/authentication": Connection reset; nested exception is java.net.SocketException: Connection reset at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:744) at org.springframework.web.client

问题 Just like it is possible to set connections via an environment variable following the name AIRFLOW_CONN_{conn_id} , is there a way to set pools? This is so I can set up a local Docker test environment with all configurations populated. 来源： https://stackoverflow.com/questions/58136365/how-to-add-an-airflow-pool-via-environment-variable

问题 Just like it is possible to set connections via an environment variable following the name AIRFLOW_CONN_{conn_id} , is there a way to set pools? This is so I can set up a local Docker test environment with all configurations populated. 来源： https://stackoverflow.com/questions/58136365/how-to-add-an-airflow-pool-via-environment-variable