pkuwm commented on a change in pull request #1035:
URL: https://github.com/apache/helix/pull/1035#discussion_r431681552
##########
File path:
zookeeper-api/src/main/java/org/apache/helix/zookeeper/api/client/RealmAwareZkClient.java
##########
@@ -71,10 +71,14 @@
// listener subscription
List<String> subscribeChildChanges(String path, IZkChildListener listener);
+ List<String> subscribeChildChanges(String path, IZkChildListener listener,
boolean skipWatchingNodeNotExist);
Review comment:
This is a public interface And HelixZkClient also extends it, do we need
a default implementation for backward compatibility?
##########
File path:
zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
##########
@@ -257,12 +274,22 @@ public void subscribeDataChanges(String path,
IZkDataListener listener) {
}
}
}
- watchForData(path);
+
Review comment:
Agreed. Maybe we could do this: add listeners first. If watch fails, we
remove listeners?
##########
File path:
zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
##########
@@ -1270,6 +1325,9 @@ public void deleteRecursively(String path) throws
ZkClientException {
private void processDataOrChildChange(WatchedEvent event, long
notificationTime) {
final String path = event.getPath();
final boolean pathExists = event.getType() != EventType.NodeDeleted;
+ if (EventType.NodeDeleted == event.getType()) {
+ LOG.info("event delelete:" + event.getPath());
Review comment:
Is this log necessary? May pollute the logs?
##########
File path:
zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
##########
@@ -1858,24 +1923,47 @@ public Object call() throws Exception {
});
}
+ private boolean watchForData(final String path, boolean
skipWatchingNodeNotExist) {
+ try {
+ if (skipWatchingNodeNotExist) {
+ Stat stat = new Stat();
Review comment:
No need to get stat? Passing null is enough.
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