thanks very much for your explain.
what I still puzzled is
public KeeperState getState() {
return keeperState;
}
public EventType getType() {
return eventType;
}
public String getPath() {
return path;
}
the three method should be return quickly ,but the thread showed interrupt
,the main thread print 123 , I think it is wired.
沈冠璞
奇虎360 PC网游事业部
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在 2014年10月21日，上午11:01，Jürgen Wagner (DVT)
<[email protected]<mailto:[email protected]>> 写道：
Hello,
Zookeeper works asynchronously in several threads. Therefore the sequence of
execution in different threads is not generally predictable. It could therefore
happen that when the connection status change is detected, the Watcher is
executed, but only the first "hello zookeeper" gets echoed, then the main
thread gets some cycles again and prints "123", after which the second print
statement "hello event!..." is executed. If you don't want this to happen, use
a CountDownLatch to make the main thread wait until the Zookeeper connection is
established and propertly recognized in your program. The main thread creates
the CountDownLatch(1), opens the Zk connection and waits latch.await(). The
Watcher does its job and then counts the latch down by one, causing the main
thread to leave the await and continue doing its job.
Best regards,
--Jürgen
On 21.10.2014 04:40, 沈冠璞 wrote:
thanks for your reply.
but i means the order should be :
hello zookeeper
hello event! type=None, stat=SyncConnected, path=null
123
but the real result order is :
hello zookeeper
123
hello event! type=None, stat=SyncConnected, path=null
Best Regards!
Guanpu Shen
在 2014年10月21日，上午9:07，Biju N
<[email protected]<mailto:[email protected]><mailto:[email protected]><mailto:[email protected]>>
写道：
The "System.out.println(new String(zk.getData(znode,false,null)));" is
causing 123 to be displayed.
On Fri, Oct 17, 2014 at 12:15 AM, 沈冠璞
<[email protected]<mailto:[email protected]><mailto:[email protected]><mailto:[email protected]>>
wrote:
hi, I am a newbie of the zookeeper.I have a question on get data order.
here is my program:
public class ZkReader {
public static void main(String[] args) throws IOException,
InterruptedException, KeeperException {
String hostPort = "10.16.73.22,10.16.73.12,10.16.73.13";
String znode = "/test";
ZooKeeper zk = new ZooKeeper(hostPort, 3000, new MyWatcher());
System.out.println(new String(zk.getData(znode,false,null)));
}
}
class MyWatcher implements Watcher {
@Override
public void process(WatchedEvent event) {
System.out.println("hello zookeeper");
System.out.println(String.format("hello event! type=%s, stat=%s,
path=%s",event.getType(),event.getState(),event.getPath()));
}
}
the result:
hello zookeeper
123
hello event! type=None, stat=SyncConnected, path=null
I don’t know why the data of node /test: 123 , shows between "hello
zookeeper" and "hello event!”
Could somebody explain for me? Thanks a lot.
Best Regards!
Guanpu Shen
--
Mit freundlichen Grüßen/Kind regards/Cordialement vôtre/Atentamente/С уважением
i.A. Jürgen Wagner
Head of Competence Center "Intelligence"
& Senior Cloud Consultant
Devoteam GmbH, Industriestr. 3, 70565 Stuttgart, Germany
Phone: +49 6151 868-8725, Fax: +49 711 13353-53, Mobile: +49 171 864 1543
E-Mail: [email protected]<mailto:[email protected]>, URL:
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