zhangmeng916 commented on a change in pull request #1460:
URL: https://github.com/apache/helix/pull/1460#discussion_r504121634
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File path:
helix-core/src/main/java/org/apache/helix/messaging/handling/AsyncCallbackService.java
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@@ -113,12 +104,19 @@ public HelixTaskResult handleMessage() throws
InterruptedException {
+ _correlationId);
AsyncCallback callback = _callbackMap.get(_correlationId);
- synchronized (callback) {
- callback.onReply(_message);
- if (callback.isDone()) {
- _logger.info("Removing finished callback, correlationid:" +
_correlationId);
- _callbackMap.remove(_correlationId);
+ if (callback != null) {
+ synchronized (callback) {
+ callback.onReply(_message);
+ if (callback.isDone()) {
+ _logger.info("Removing finished callback, correlationid:" +
_correlationId);
+ _callbackMap.remove(_correlationId);
+ }
}
+ } else {
+ String msg = "Message " + _message.getMsgId()
+ + " does not have correponding callback. Probably timed out
already. Correlation id: "
+ + _correlationId;
+ _logger.warn(msg);
Review comment:
A question regarding the description, if the error is just logged here,
meaning the users won't really know there is a mismatch. If the callback is not
done, they won't be able to distinguish between this error and other errors. Is
this the expected behavior?
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