kaisun2000 commented on a change in pull request #1295:
URL: https://github.com/apache/helix/pull/1295#discussion_r476910637
##########
File path:
zookeeper-api/src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java
##########
@@ -222,22 +226,16 @@ protected ZkClient(IZkConnection zkConnection, int
connectionTimeout, long opera
_asyncCallRetryThread.start();
LOG.debug("ZkClient created with _uid {}, _asyncCallRetryThread id {}",
_uid, _asyncCallRetryThread.getId());
- connect(connectionTimeout, this);
-
- // initiate monitor
- try {
- if (monitorKey != null && !monitorKey.isEmpty() && monitorType != null
&& !monitorType
- .isEmpty()) {
- _monitor =
- new ZkClientMonitor(monitorType, monitorKey, monitorInstanceName,
monitorRootPathOnly,
- _eventThread);
- _monitor.register();
- } else {
- LOG.info("ZkClient monitor key or type is not provided. Skip
monitoring.");
- }
- } catch (JMException e) {
- LOG.error("Error in creating ZkClientMonitor", e);
+ if (monitorKey != null && !monitorKey.isEmpty() && monitorType != null &&
!monitorType
+ .isEmpty()) {
+ _monitor =
+ new ZkClientMonitor(monitorType, monitorKey, monitorInstanceName,
monitorRootPathOnly,
+ _eventThread);
Review comment:
This does not seem to work.
First it is not necessary to pass _monitor into `connect(connectTimeout,
this, _monitor);` as _monitor is instance variable and connect is method.
Connect can see it anyway.
Second, the gist to avoid all these racing issue is that we must make sure
_monitor is fully constructed and also register-ed before ZkClient either get
callback from ZK.
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