[ZOOKEEPER-218] error in barrier recipe example code

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.1, 3.1.0
• Component/s: documentation
• Hadoop Flags: Reviewed
• Assignee: Patrick D. Hunt
• Reporter: Patrick D. Hunt
• Created: 10/Nov/08 22:24
• Updated: 13/Feb/09 21:18
• Resolved: 18/Nov/08 23:14

Description

Report from user Murali Vemulapati. The wiki recipe page also should be updated to handle multiple clients using the barrier on the same system (multiple processes, etc...). Currently the docs/example support only a single user of the barrier per host.

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I believe there is a typo in the barrier example given at:

http://hadoop.apache.org/zookeeper/docs/current/zookeeperTutorial.html

With the following fix, the program runs as expected:
==============
83c83
< this.name = new String(InetAddress.getLocalHost().getCanonicalHostName().toString());
—
> name = new String(InetAddress.getLocalHost().getCanonicalHostName().toString());
100c100
< CreateMode.EPHEMERAL_SEQUENTIAL);
—
> CreateMode.EPHEMERAL);
==============
The first change assigns the name to the instance variable 'name' of Barrier class (otherwise the 'name' instance variable will have a value of 'null'
when calling zk.create to create the child node under the root barrier node).
The second change lets us run multiple processes on the same machine.

thanks
murali