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Posted to user@cassandra.apache.org by Yang <te...@gmail.com> on 2010/10/19 10:09:26 UTC
Cassandra + Zookeeper, what is the current state?
I read from the Facebook cassandra paper that zookeeper "is used
....." for certain things ( membership and Rack-aware placement)
but I pulled 0.7.0-beta2 source and couldn't grep out anything with
"Zk" or "Zoo", nor any files with "Zk/Zoo" in the names
is Zookeeper really used? docs/blog posts from online search kind of
give conflicting answers
Thanks
Yang
Re: Cassandra + Zookeeper, what is the current state?
Posted by Jeremy Hanna <je...@gmail.com>.
That code has never existed in the public. It was taken out before it was open-sourced.
On Oct 19, 2010, at 11:45 AM, Yang wrote:
> Thanks guys.
>
> but I feel it would probably be better to refactor out the hooks and
> make components like zookeeper pluggable , so users could use either
> zookeeper or the current config-file based seeds discovery
>
> Yang
>
> On Tue, Oct 19, 2010 at 9:02 AM, Jeremy Hanna
> <je...@gmail.com> wrote:
>> Further, when they open-sourced cassandra, they removed certain things that are specific to their environment at facebook, including zookeeper integration. In the paper it has some specific purposes, like finding seeds iirc. Apache Cassandra has no dependency on zookeeper. I think that's a good thing as managing cassandra is easier without those kinds of dependencies, e.g. for shops that don't currently use any hadoop components.
>>
>> On Oct 19, 2010, at 3:11 AM, Norman Maurer wrote:
>>
>>> No Zookeeper is not used in cassandra. You can use Zookeeper as some
>>> kind of add-on to do locking etc.
>>>
>>> Bye,
>>> Norman
>>>
>>>
>>> 2010/10/19 Yang <te...@gmail.com>:
>>>> I read from the Facebook cassandra paper that zookeeper "is used
>>>> ....." for certain things ( membership and Rack-aware placement)
>>>>
>>>> but I pulled 0.7.0-beta2 source and couldn't grep out anything with
>>>> "Zk" or "Zoo", nor any files with "Zk/Zoo" in the names
>>>>
>>>>
>>>> is Zookeeper really used? docs/blog posts from online search kind of
>>>> give conflicting answers
>>>>
>>>>
>>>> Thanks
>>>> Yang
>>>>
>>
>>
Re: Cassandra + Zookeeper, what is the current state?
Posted by Yang <te...@gmail.com>.
Thanks guys.
but I feel it would probably be better to refactor out the hooks and
make components like zookeeper pluggable , so users could use either
zookeeper or the current config-file based seeds discovery
Yang
On Tue, Oct 19, 2010 at 9:02 AM, Jeremy Hanna
<je...@gmail.com> wrote:
> Further, when they open-sourced cassandra, they removed certain things that are specific to their environment at facebook, including zookeeper integration. In the paper it has some specific purposes, like finding seeds iirc. Apache Cassandra has no dependency on zookeeper. I think that's a good thing as managing cassandra is easier without those kinds of dependencies, e.g. for shops that don't currently use any hadoop components.
>
> On Oct 19, 2010, at 3:11 AM, Norman Maurer wrote:
>
>> No Zookeeper is not used in cassandra. You can use Zookeeper as some
>> kind of add-on to do locking etc.
>>
>> Bye,
>> Norman
>>
>>
>> 2010/10/19 Yang <te...@gmail.com>:
>>> I read from the Facebook cassandra paper that zookeeper "is used
>>> ....." for certain things ( membership and Rack-aware placement)
>>>
>>> but I pulled 0.7.0-beta2 source and couldn't grep out anything with
>>> "Zk" or "Zoo", nor any files with "Zk/Zoo" in the names
>>>
>>>
>>> is Zookeeper really used? docs/blog posts from online search kind of
>>> give conflicting answers
>>>
>>>
>>> Thanks
>>> Yang
>>>
>
>
Re: Cassandra + Zookeeper, what is the current state?
Posted by Jeremy Hanna <je...@gmail.com>.
Further, when they open-sourced cassandra, they removed certain things that are specific to their environment at facebook, including zookeeper integration. In the paper it has some specific purposes, like finding seeds iirc. Apache Cassandra has no dependency on zookeeper. I think that's a good thing as managing cassandra is easier without those kinds of dependencies, e.g. for shops that don't currently use any hadoop components.
On Oct 19, 2010, at 3:11 AM, Norman Maurer wrote:
> No Zookeeper is not used in cassandra. You can use Zookeeper as some
> kind of add-on to do locking etc.
>
> Bye,
> Norman
>
>
> 2010/10/19 Yang <te...@gmail.com>:
>> I read from the Facebook cassandra paper that zookeeper "is used
>> ....." for certain things ( membership and Rack-aware placement)
>>
>> but I pulled 0.7.0-beta2 source and couldn't grep out anything with
>> "Zk" or "Zoo", nor any files with "Zk/Zoo" in the names
>>
>>
>> is Zookeeper really used? docs/blog posts from online search kind of
>> give conflicting answers
>>
>>
>> Thanks
>> Yang
>>
Re: Cassandra + Zookeeper, what is the current state?
Posted by Norman Maurer <no...@apache.org>.
No Zookeeper is not used in cassandra. You can use Zookeeper as some
kind of add-on to do locking etc.
Bye,
Norman
2010/10/19 Yang <te...@gmail.com>:
> I read from the Facebook cassandra paper that zookeeper "is used
> ....." for certain things ( membership and Rack-aware placement)
>
> but I pulled 0.7.0-beta2 source and couldn't grep out anything with
> "Zk" or "Zoo", nor any files with "Zk/Zoo" in the names
>
>
> is Zookeeper really used? docs/blog posts from online search kind of
> give conflicting answers
>
>
> Thanks
> Yang
>