Hi there,
I am using Apache Curator 4.1.0 with Zk 3.4.10 (Open JDK 1.8)
openjdk version "1.8.0_191"
I am PersistentNode recipe and I am receiving this exception
java.lang.IllegalStateException: initial create has not been processed. Call
waitForInitialCreate() to ensure. at
org.apache.curator.shaded.com.google.common.base.Preconditions.checkState(Preconditions.java:444)
at
org.apache.curator.framework.recipes.nodes.PersistentNode.setData(PersistentNode.java:392)
at
com.cheva.udr.sm.RemoteReporter.reportToRemote(RemoteReporter.java:67)
at com.cheva.udr.sm.RemoteReporter.lambda$2(RemoteReporter.java:84) at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
My class RemoteReporter.java (assumes that PersistentNode is thread safe)
// The class is final, and the attribute is private final so allow safe
publicationprivate final Persistent pn;
Constrcutor() {...PersistentNode pn = new PersistentNode(cf,
CreateMode.EPHEMERAL, false, path, dataToReport());
}
// Class has also an start methodstart() {...79 pn.start();...//
Create new thread and execute the follwoing code84
pn.waitForInitialCreate(1000, TimeUnit.DAYS);85 pn.setData("XXx");86
statusCache.getListenable().addListener(listener);}
I was checking the PersistentNode code and the excepction happens because
nodePath.get()==null variable. I am not 100% sure if the problem is in my code
or in the recipe...
- My code is using the waitForinitial as suggested- The recipe uses a
CountDownLatch, but there are 2 different paths for the latch to be countDown
(via initalisationComplete() method), and I am not sure that one of them
assures that nodePath.get() != null
In this code snippet, you can see that the latch is countDown, but I am not
sure that nodePath.set(whatever) is called, so I guess there could be a race
condition
private final BackgroundCallback setDataCallback = new BackgroundCallback()
{
@Override public void processResult(CuratorFramework dummy,
CuratorEvent event) throws Exception { //If the
result is ok then initialisation is complete (if we're still initialising)
//Don't retry on other errors as the only recoverable cases will be
connection loss //and the node not existing, both of which are
already handled by other watches. if ( event.getResultCode() ==
KeeperException.Code.OK.intValue() ) { //Update is
ok, mark initialisation as complete if required.
initialisationComplete(); } else if (
event.getResultCode() == KeeperException.Code.NOAUTH.intValue() ) {
log.warn("Client does not have authorisation to write node at
path {}", event.getPath()); authFailure.set(true); }
} };
Thanks in adavance for the help,
Evaristo
