heartbeat listener

issues that may occur with TCP long connections 1. Many firewall routers and so on for the free socket auto-shutdown 2. For non-normal disconnection, the server is not able to detect. In order to reclaim resources, a detection mechanism must be provided. So, there is the heartbeat (HeartBeat) mechanism. two implementation schemes of heartbeat mechanism For now,

Heartbeat pack ..."); try {Out.write (hello);catch (IOException e) {System.out.println ("Send heartbeat packet failed.");return false;} System.out.println ("Wait for server Heartbeat pack ..."); while (true) {TMP = GetData (in, 5);if (tmp[0] = = 0) {SYSTEM.OUT.PRINTLN ("The server did not return the heartbeat pa

Heartbeat does not respond after startup, and heartbeat starts a response. After applying heartbeat to the production environment, start service heartbeat start and no response will be made after discovery. Check the tail-f/var/log/ha-log as follows: Heartbeat [30680]: 2015/

Many application-layer protocols have a heartbeat mechanism, usually the client sends a packet to the server every other time, notifying the server that it is still online and transmitting some data that may be necessary. Typical protocols for using heartbeat packets are IM, such as qq/msn/fetion.Students who have learned TCP/IP should know that the two main protocols of the transport layer are UDP and TCP,

How to Implement Socket heartbeat packets and socket heartbeat packets A client has been created recently, but a disconnection detection function is required. Let's take a look at using the custom HeartBeat method to check the client connection. How to Implement heartbeat packets: After the client is connected to the s

HeartBeat Heartbeat The necessity of heartbeat detection1. Cluster heartbeat detection to avoid network interruption2. Data synchronization: Master node write log, pull master node log from node every time.The significance of heartbeat detection:the client and the server hav

MySQL Master/Slave latency monitoring script (pt-heartbeat), mysqlpt-heartbeat We can use percona's powerful weapon pt-heartbeat to monitor the master-slave replication latency of MySQL databases. Pt-heartbeat updates a specific table in the master database by using a timestamp. Then, it reads the updated timestamp fro

Transferred from:http://blog.csdn.net/keda8997110/article/details/8349049Heartbeat Heartbeat Technology Principle:Heartbeat (Linux-ha) Working principle: Heartbeat core consists of two parts, heartbeat monitoring part and the resource taking over part, heartbeat monitoring can be carried out through the network link an

One way to view the rac heartbeat ip address is to view the rac heartbeat ip address. A Method for viewing heartbeat IP addresses Source: GI Fails to Start as no Private Network Interface is Available (Doc ID 1481176.1) From ocssd. log: 16:28:07. 224: [CSSD] [3316] clssnmReadNodeInfo: NM endp for node 2 (racnode2)-gipc: // racnode2: my-cluster #192.168.0.2 #49921

Heartbeat vibration Vibrator Used, heartbeat vibration vibrator The device vibrator can be used to set the vibration frequency to simulate the heartbeat vibration. There are two ways to obtain the device vibrator: Vibrator = (Vibrator) getSystemService (VIBRATOR_SERVICE ); Vibrator = (Vibrator) getApplicationContext (). getSystemService (Service. VIBRATOR_SERVICE

use Alarmmanager to implement the heartbeat feature to make it truly long-connected. on the server side of the implementation:on the server side, can be implemented in many languages, such as C/c++,java,erlang and so on, such as our domestic relatively good aurora push (C development), OpenFire (Java development) and so on. recently I saw the introduction and principle of the Aurora push, so I'll talk about what kind of problems they are having, and