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From 殷芳玺 <yinfan...@kuaishou.com>
Subject 答复: It is necessary to backport ZOOKEEPER-3104 to branch-3.4
Date Wed, 23 Oct 2019 02:28:34 GMT

Great !

!n my personal opinion, ZOOKEEPER-3104 backport should be necessary before 3.4 EOL.

Zookeeper 3.4 is widely used in industry.  Any known critical issues should be fixed before
its EOL.

Data consistency is crucial for zookeeper.

Code review comments are welcome for the pull request. Hope it be refined and merged to branch-3.4
upstream sooner.


Best Regards


发件人: Norbert Kalmar <nkalmar@cloudera.com.INVALID>
发送时间: 2019年10月22日 下午 10:38:39
收件人: dev@zookeeper.apache.org
主题: Re: It is necessary to backport ZOOKEEPER-3104 to branch-3.4

Hi Pierre,

As this is a critical bugfix IMO, I don't see why it shouldn't be
backported to 3.4. It hasn't been stated AFAIK that 3.4 is no longer
As for when there could be a new 3.4 release, that's a different question
though. Let's see what the PMCs think about it.

(I also added 3.5.5 to the jira's fix version, az is contains the fix but
was missing.)


On Tue, Oct 22, 2019 at 2:33 PM 殷芳玺 <yinfangxi@kuaishou.com> wrote:

> Hi, Folks:
> ZOOKEEPER-3104 is a critical issue for data inconsistency. The risk also
> exists in 3.4 branch.
> In one of our 3.4.13 clusters, the data inconsistency happens for many
> times.
> After digging some transaction logs and snapshot, we believe that
> ZOOKEEPER-3104<https://issues.apache.org/jira/browse/ZOOKEEPER-3104> is
> the main risk to contributes to our data inconsistency.
> The risk probability maybe higher than we can consider in real product
> environment.  The serialization of big DataTree may leads to a big risk
> time window in the high writing traffic situation. Any failure during the
> risk time window would cause the data inconsistency.
> The data inconsistency is almost unacceptable in zookeeper semantic.
> This issue is already fixed in 3.6. But I think it is very necessary to
> backport ZOOKEEPER-3104<
> https://issues.apache.org/jira/browse/ZOOKEEPER-3104> to branch-3.4,
> especially in the situation that the migration from 3.4 to 3.5 actually
> take more effort to evaluate the compatibility risk in real product
> environment.
> I have already opened an issue [ZOOKEEPER-3589](
> https://issues.apache.org/jira/browse/ZOOKEEPER-3589) and submit a github
> pull request https://github.com/apache/zookeeper/pull/1123 to fix it.
> So I suggest to accept the pull request and release it in 3.4.16. This fix
> would make branch-3.4 more robust and fully-fledged.
> Thanks!
> Best regards
> Pierre Yin
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