ZooKeeper is a distributed, open-source coordination service for distributed applications. It exposes a simple set of primitives that distributed applications can build upon to implement higher level services for synchronization, configuration maintenance, and groups and naming. It is designed to be easy to program to, and uses a data model styled after the familiar directory tree structure of file systems. It runs in Java and has bindings for both Java and C.
| ZooKeeper Service |
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Get Source Code
git clone https://git.apache.org/zookeeper.git
svn checkout https://svn.apache.org/repos/asf/zookeeper/trunk/
Prepare for building
JDK:
openjdk version "1.8.0_91"
OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-3ubuntu1~16.04.1-b14)
Software dependency:
sudo apt-get install doxygen
sudo apt-get install perl
sudo apt-get install shtool
sudo apt-get install graphviz
Ant:
Apache Ant(TM) version 1.9.6
Building Zookeeper
build.xml
--- a/build.xml +++ b/build.xml @@ -40,8 +40,8 @@ xmlns:cs="antlib:com.puppycrawl.tools.checkstyle.ant"> <property name="revision.properties" value="revision.properties" /> <property file="${basedir}/src/java/${revision.properties}" /> - <property name="javac.target" value="1.7" /> - <property name="javac.source" value="1.7" /> + <property name="javac.target" value="1.8" /> + <property name="javac.source" value="1.8" /> <property name="build.encoding" value="utf8" /> |
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Building & UT using ant
$ ant $ ant -Djavac.args="-Xlint -Xmaxwarns 1000 " clean test tar |
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ja
Configuration
To start ZooKeeper we need a configuration file. Here is a sample, create it in conf/zoo.cfg:
tickTime=2000 dataDir=/var/lib/zookeeper clientPort=2181 |
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tickTime
the basic time unit in milliseconds used by ZooKeeper. It is used to do heartbeats and the minimum session timeout will be twice the tickTime.
dataDir
the location to store the in-memory database snapshots and, unless specified otherwise, the transaction log of updates to the database.
clientPort
the port to listen for client connections
Start ZooKeeper
$ bin/zkServer.sh start ZooKeeper JMX enabled by default |
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From JPS, zookeeper is running on AArch64 Server :
$ jps 20351 ZooKeeperMain |
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