sleberknight / zookeeper-samples

Sample code for a presentation on ZooKeeper.

This is now archived, since the presentation was back in 2012 and the code hasn't really changed, and doesn't need to.

This is code that accompanies a talk I gave on Apache ZooKeeper.

The slides can be found at http://www.slideshare.net/scottleber/apache-zookeeper

May 2017 Update:

• Updated ZooKeeper version to 3.4.10
• Updated Curator version to 2.12.0
• Changed all System.out to SLFJ Loggers
• A bunch of misc. code cleanup, e.g. converting anonymous inner classes to lambdas, using diamond operator, etc.

October 2023 update:

• Update Zookeeper version to 3.9.1
• Update Curator version to 5.5.0
• Update SLF4J version to 2.0.9 and remove SLF4J to Log4J bridge
• Update to use JDK 17
• Update plugins and several other dependencies, clean up the POM, etc.
• Switch to use JUnit 5 (Jupiter) and AssertJ assertions
• Remove test support classes EmbeddedZooKeeperServer and EmbeddedZooKeeperServerRule; they cause the tests to hang, and it's better to use Curator's testing server anyway

zookeeper-samples's Issues

ZNodeName sorting won't work

zookeeper-samples/src/main/java/org/apache/zookeeper/recipes/lock/ZNodeName.java

Line 77 in 44aaf4c

int answer = this.prefix.compareTo(that.prefix);

Comparing the prefix first breaks the locking logic

Make DistributedOperation use generics

Make DistributedOperation use generics, e.g.

public interface DistributedOperation {
T execute() throws DistributedOperationException;
}

Add tryLock() method in BlockingWriteLock

It should wait for some (relatively small) amount of time and return a boolean indicating whether the lock was obtained.