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From Eric Tschetter <eched...@gmail.com>
Subject Re: Real world usage of the recipe LeaderLatch
Date Wed, 26 Jun 2013 15:52:33 GMT
ChuChao,

We use it in the Druid project (http://www.github.com/metamx/druid/)

You can see its use in the class com.metamx.druid.master.DruidMaster

The class has a bunch of other stuff in it as well that is not specific to
the LeaderLatch, but you can just ignore that and see how it handles the
latch.

--Eric

On Wednesday, June 26, 2013, chao chu wrote:

> Thanks a lot for your reply. Could you please name a few open source
> projects that used LeaderLatch if you are aware of any? I'd like to take a
> look at the code.
>
> btw, What about issues reported in the links I mentioned? are they actual
> bugs or just used in an unexpected way?
>
>
>
> On Wed, Jun 26, 2013 at 7:29 AM, Jordan Zimmerman <
> jordan@jordanzimmerman.com <javascript:_e({}, 'cvml',
> 'jordan@jordanzimmerman.com');>> wrote:
>
>> Curator is being used at major companies (i.e. Netflix, eBay, etc.). Bugs
>> are quickly fixed when reported. In particular, LeaderLatch is widely used.
>>
>> -JZ
>>
>>
>> On Jun 25, 2013, at 11:03 AM, chao chu <chuchao333@gmail.com<javascript:_e({},
'cvml', 'chuchao333@gmail.com');>>
>> wrote:
>>
>> Hi,
>>
>> I have been trying to use the LeaderLatch to implement Leader Election in
>> my project and had written some scripts to simulate the situations when the
>> zk ensemble become unstable due to network problems. It worked well and as
>> expected so far.
>>
>> However, by digging into both zookeeper-users and curator-users mailing
>> lists, there are indeed some bugs/edge cases reported, like
>> LeaderLatch bug causing extra znodes appearing in Zookeeper<https://groups.google.com/forum/?fromgroups#!searchin/curator-users/LeaderLatch/curator-users/to8ViZp6p-E/xYbKbzqkZQYJ>
>>  and multiple participants thought they are leader<https://listserv.netflix.com/pipermail/curator-users/2012-October/000201.html>
which
>> worried me about the reliability of this.
>>
>> So, my question is that: are there any real world projects are using this
>> recipe which have proved the quality of it, or are there any other known
>> edge cases or open issues?
>>
>>
>> Thanks & Regards,
>>
>> --
>> ChuChao
>>
>>
>>
>
>
> --
> ChuChao
>

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