Re: [Zookeeper-user] Problems with basics

[Mahadev K. <ma...@ya...>]

Hi Ted,
  Thanks for your email. I will get back with the response and updates
to the documentation as soon as possible. 

For now, looking at your example it seems like you are trying to
delete("/test") while it still has a child "/test/foobar"?

The delete in zookeeper is not recursive. The keeper exception is
actually notempty exception if you look in 

java/src/com/yahoo/zookeeper/KeeperException.java

Please file a bug so that the exception printed is a little more
informative.

Regards
Mahadev

> -----Original Message-----
> From: zoo...@li...
[mailto:zookeeper-user-
> bo...@li...] On Behalf Of Ted Dunning
> Sent: Friday, April 11, 2008 4:53 PM
> To: zoo...@li...
> Subject: [Zookeeper-user] Problems with basics
> 
> 
> Hi,
> 
> First, congrats on a really clean, simple and apparently awesome
system.
> I
> look forward to using it.
> 
> I am trying to set up some of our systems to use zookeeper, but am
having
> some problems with very basic things.
> 
> Here is a summary of grump causing things that I have gotten past:
> 
> A) common ACL patterns appear to not be declared in a nice accessible
way.
> There are some things in ZooDefs, but they are hard to use due to deep
> nesting of classes.
> 
> B) the signature of create requires an ArrayList instead of a List.
This
> makes common idioms very verbose (unnecessarily so).
> 
> C) the digest authentication scheme is not particularly well
documented.
> A
> code sample would help.
> 
> D) the examples don't explain the arguments to the constructor of
> Zookeeper
> are.  Many examples omit some basic setup code which makes them hard
to
> replicate.
> 
> 
> My major question is why the following toy program is saying this:
> 
> com.yahoo.zookeeper.KeeperException: KeeperErrorCode = Unknown error
-111
>     at com.yahoo.zookeeper.ZooKeeper.delete(ZooKeeper.java:306)
>     at TestZooKeeper.delete(TestZooKeeper.java:44)
>     at TestZooKeeper.test1(TestZooKeeper.java:30)
> 
> 
> Here is the code.  All suggestions are welcome.
> 
> public class TestZooKeeper extends TestCase {
>     static ZooKeeper zk;
>     private ArrayList<ACL> acl;
> 
>     public void test1() throws IOException, KeeperException,
> InterruptedException {
>         zk = new ZooKeeper("ted-rh:8181", 30000, new
LoggingWatcher());
> 
>         assertTrue(exists("/"));
>         assertEquals("", get("/"));
>         if (exists("/test")) {
>             delete("/test");
>         }
>         create("/test", "");
>         assertTrue(exists("/test"));
> 
>         create("/test/foobar", "test data");
> 
>     }
> 
>     private boolean exists(String path) throws KeeperException,
> InterruptedException {
>         return zk.exists(path, false) != null;
>     }
> 
>     private void delete(String path) throws KeeperException,
> InterruptedException {
>         zk.delete(path, -1);
>     }
> 
>     private String get(String path) throws KeeperException,
> InterruptedException, UnsupportedEncodingException {
>         return new String(zk.getData(path, false, null), "UTF-8");
>     }
> 
> 
>     private void create(String path, String content) throws
> KeeperException,
> InterruptedException, UnsupportedEncodingException {
>         acl = new ArrayList<ACL>(Collections.singletonList(new
> ACL(ZooDefs.Perms.ALL, new Id("world", "anyone"))));
>         zk.create(path, content.getBytes("UTF-8"), acl, 0);
>     }
> }
> 
> 
>
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