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https://issues.apache.org/jira/browse/ZOOKEEPER-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16942486#comment-16942486
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Zili Chen commented on ZOOKEEPER-3566:
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TBH I think it requires we evolve {{WatcherEvent}} which is the actual message
on wire but jute doesn't works well on schema evolution.
See also ZOOKEEPER-3290
CC [~andorm]
> 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
> Priority: Major
>
> 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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