Samuel Nelson created ZOOKEEPER-3566:
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Summary: Send event zxid to watches
Key: ZOOKEEPER-3566
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3566
Project: ZooKeeper
Issue Type: Improvement
Components: server
Reporter: Samuel Nelson
The zxid that triggered a watch should be sent to the watch because it's useful
for ordering events.
Use case:
I'm watching a znode and syncing its contents (and whether it has been deleted)
to a third system. Without zxid attached to events it makes it very difficult
to maintain the order of events as they happened in ZK.
For example if I modify node `/a/b/c` and then delete it soon after, we have
two watch events, but no reliable way to communicate to our third system that
the modification happened before the deletion. If we are given the zxid we can
use that to order events.
Suggested implementation:
Change `IWatchManager#triggerWatch` to take another parameter `Long zxid`.
Callers pass the zxid of the event.
Add member `Long zxid` to `WatchedEvent`
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