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https://issues.apache.org/jira/browse/ZOOKEEPER-4747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17768521#comment-17768521
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Kezhu Wang commented on ZOOKEEPER-4747:
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{quote} This is what I do in EagerACLFilterTest::syncClient, it is apparently
unfriendly to end users. {quote}
This may not be a good example as it is a test code to enforce some
"happen-before" relationship. But it does not affect the discussion.
> Java api lacks synchronous version of sync() call
> -------------------------------------------------
>
> Key: ZOOKEEPER-4747
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4747
> Project: ZooKeeper
> Issue Type: New Feature
> Components: java client
> Reporter: Kezhu Wang
> Assignee: Kezhu Wang
> Priority: Major
> Fix For: 3.10.0
>
>
> Ideally, it should be redundant just as what [~breed] says in ZOOKEEPER-1167.
> {quote}
> it wasn't an oversight. there is no reason for a synchronous version. because
> of the ordering guarantees, if you issue an asynchronous sync, the next call,
> whether synchronous or asynchronous will see the updated state.
> {quote}
> But in case of connection loss and absent of ZOOKEEPER-22, client has to
> check result of asynchronous sync before next call. So, currently, we can't
> simply issue an fire-and-forget asynchronous sync and an read to gain strong
> consistent. Then in a synchronous call chain, client has to convert
> asynchronous {{sync}} to synchronous to gain strong consistent. This is what
> I do in
> [EagerACLFilterTest::syncClient|https://github.com/apache/zookeeper/blob/f42c01de73867ffbc12707b3e9f9cd7f847fe462/zookeeper-server/src/test/java/org/apache/zookeeper/server/quorum/EagerACLFilterTest.java#L98],
> it is apparently unfriendly to end users.
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