Zookeeper Personal understanding

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2 installation

Stand-alone mode

Unzip, bin/zkserver.sh

Configuration file change Conf/zoo_sample.cfg to Conf/zoo.cfg

Ticktime Heartbeat

Dtatdir Data and log paths

Clientprot Port

3 cluster mode

Besides changing the top three, there's a

Initlimit:follower the number of time heartbeats that the server returns to the primary node, such as

Ticktime=2000,initlimit=5, if 2000*5=10000=10s doesn't return, the connection fails.

Synclimit: Request to answer the number of heartbeats, similar to the Initlimit calculation

Server.a=b:c:d

A machine number

b IP

C Lead and machine interaction ports

D election lead hung up after the lead communication with

And then:

Myid File Store A (service name), read at startup to determine exactly which server, path is DataDir

myID which machine will be the name of the store

4 Pseudo-Cluster mode

The same machine achieves its purpose by configuring different ports

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Package com.zookeeper.example;
Import java.util.ArrayList;

Import java.util.List;

Import Com.sun.org.apache.bcel.internal.generic.NEW;

Import sun.security.krb5.internal.NetClient;
	public class Zookeepersam {int num=20;} class zookeeper{int num;
	int searchnum;
	int indexnum;
	String leadstate;
	CGI CGI;
	Leadservicemechine Leadservicemechine;
	Bakleadservicemechine Bakleadservicemechine;
			public void Changeleadservice () {if (leadstate== "down") {Startleadservice (bakleadservicemechine);
		Changecginetandadd (CGI); }} public void Startleadservice (service service) {} public void Changecginetandadd (CGI cgi) {} public void
		Run () {Buildznode ("a");
		GetChildren ("a");
		Getchildrenlist ();
		if (Judgechange ()!=null) {}} public void Buildznode (String str) {Znode Znode = new Znode (str);
	Nodes.Add (Znode);
	} list<znode> nodes = new arraylist<znode> (); public void GetChildren (String name) {} public void Getchildrenlist () {} pUblic Znode Judgechange () {return null;
	}} class Znode{public Znode () {} public Znode (String s) {}} class cgi{} class service{net net;
Address address; } class net{} class address{} class Leadservicemechine extends service{} class Bakleadservicemechine extends Serv
	ice{} class servicemechine{String state;//5/15//state can toggle Zookeeper Zookeeper; public void Deal () {if (state== "index") {} if ("Search" ==state) {}}} class nameservice{} class Statesy ncservice{} class clustermanager{} class configuremanager{}