How to start zookeeper ensemble using Curator TestingServer

Question

I am just trying to start a zookeeper ensemble (Leader - follower) with java implementation using the Curator frame work or zookeeper .

Initially i have checked with binary mode and it was working fine with example configs shown below.

zoo.cfg

tickTime=2000
dataDir=/var/lib/zookeeper/
clientPort=2181
initLimit=5
syncLimit=2
server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888

and myid files created accordingly and the zookeeper ensemble created as i expected (Leader - Followers created).

Connections: 4
Outstanding: 0
Zxid: 0x30000052a
Mode: leader
Node count: 158
Proposal sizes last/min/max: 146/36/1471

When i tried to achieve the same using org.apache.zookeeper.server.quorum.QuorumPeerConfig configs with Classes,

org.apache.zookeeper.server.ZooKeeperServerMain

ZooKeeperServerMain zkServer = new ZooKeeperServerMain();
        final ServerConfig configuration = new ServerConfig();
        configuration.readFrom(peerConfig);
        new Thread(() -> {
            try {
                zkServer.runFromConfig(configuration);
                Thread.sleep(2000);
            } catch (Exception e) {
                logger.error("ZooKeeper Failed", e);
            }
        }).start();

org.apache.curator.test.TestingServer

InstanceSpec spec = new InstanceSpec(zkDataDir, clientPort, electionPort, -1, true, serverId, tickTime, maxClientCnxns, customProperties);

zkServer = new TestingServer(spec, true);

Both starts zookeeper in stand alone mode and it seems both the implementations not care about the configuration server.1=..... server.2=.... server.3=..... .

What i am missing here? how to start a zookeeper using java in leader follower mode?

Note: I am newbie with zookeeper related stuffs and docs still confusing me. Please guide me for the same.. Thanks... :)

Answer 1

Curator TestingServer can be treated as regular ZooKeeper server. As such, leader-follower can be tested with it, using Curator LeaderLatch for example.

Leader-follower unit test example

Leader-follower implementation example

Note: I am the author of this project.