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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: unbalanced ring
Date Wed, 10 Oct 2012 09:01:34 GMT
Hi,

Same thing here:

2 nodes, RF = 2. RCL = 1, WCL = 1.
Like Tamar I never ran a major compaction and repair once a week each node.

10.59.21.241    eu-west     1b          Up     Normal  133.02 GB
50.00%              0
10.58.83.109    eu-west     1b          Up     Normal  98.12 GB
 50.00%              85070591730234615865843651857942052864

What phenomena could explain the result above ?

By the way, I have copy the data and import it in a one node dev cluster.
There I have run a major compaction and the size of my data has been
significantly reduced (to about 32 GB instead of 133 GB).

How is that possible ?
Do you think that if I run major compaction in both nodes it will balance
the load evenly ?
Should I run major compaction in production ?

2012/10/10 Tamar Fraenkel <tamar@tok-media.com>

> Hi!
> I am re-posting this, now that I have more data and still *unbalanced ring
> *:
>
> 3 nodes,
> RF=3, RCL=WCL=QUORUM
>
>
> Address         DC          Rack        Status State   Load
> Owns    Token
>
> 113427455640312821154458202477256070485
> x.x.x.x    us-east     1c          Up     Normal  24.02 GB        33.33%  0
> y.y.y.y     us-east     1c          Up     Normal  33.45 GB        33.33%
> 56713727820156410577229101238628035242
> z.z.z.z    us-east     1c          Up     Normal  29.85 GB        33.33%
> 113427455640312821154458202477256070485
>
> repair runs weekly.
> I don't run nodetool compact as I read that this may cause the minor
> regular compactions not to run and then I will have to run compact
> manually. Is that right?
>
> Any idea if this means something wrong, and if so, how to solve?
>
>
> Thanks,
> *
> Tamar Fraenkel *
> Senior Software Engineer, TOK Media
>
> [image: Inline image 1]
>
> tamar@tok-media.com
> Tel:   +972 2 6409736
> Mob:  +972 54 8356490
> Fax:   +972 2 5612956
>
>
>
>
>
> On Tue, Mar 27, 2012 at 9:12 AM, Tamar Fraenkel <tamar@tok-media.com>wrote:
>
>> Thanks, I will wait and see as data accumulates.
>> Thanks,
>>
>> *Tamar Fraenkel *
>> Senior Software Engineer, TOK Media
>>
>> [image: Inline image 1]
>>
>> tamar@tok-media.com
>> Tel:   +972 2 6409736
>> Mob:  +972 54 8356490
>> Fax:   +972 2 5612956
>>
>>
>>
>>
>>
>> On Tue, Mar 27, 2012 at 9:00 AM, R. Verlangen <robin@us2.nl> wrote:
>>
>>> Cassandra is built to store tons and tons of data. In my opinion roughly
>>> ~ 6MB per node is not enough data to allow it to become a fully balanced
>>> cluster.
>>>
>>>
>>> 2012/3/27 Tamar Fraenkel <tamar@tok-media.com>
>>>
>>>> This morning I have
>>>>  nodetool ring -h localhost
>>>> Address         DC          Rack        Status State   Load
>>>>  Owns    Token
>>>>
>>>>        113427455640312821154458202477256070485
>>>> 10.34.158.33    us-east     1c          Up     Normal  5.78 MB
>>>> 33.33%  0
>>>> 10.38.175.131   us-east     1c          Up     Normal  7.23 MB
>>>> 33.33%  56713727820156410577229101238628035242
>>>>  10.116.83.10    us-east     1c          Up     Normal  5.02 MB
>>>> 33.33%  113427455640312821154458202477256070485
>>>>
>>>> Version is 1.0.8.
>>>>
>>>>
>>>>  *Tamar Fraenkel *
>>>> Senior Software Engineer, TOK Media
>>>>
>>>> [image: Inline image 1]
>>>>
>>>> tamar@tok-media.com
>>>> Tel:   +972 2 6409736
>>>> Mob:  +972 54 8356490
>>>> Fax:   +972 2 5612956
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Tue, Mar 27, 2012 at 4:05 AM, Maki Watanabe <watanabe.maki@gmail.com
>>>> > wrote:
>>>>
>>>>> What version are you using?
>>>>> Anyway try nodetool repair & compact.
>>>>>
>>>>> maki
>>>>>
>>>>>
>>>>> 2012/3/26 Tamar Fraenkel <tamar@tok-media.com>
>>>>>
>>>>>> Hi!
>>>>>> I created Amazon ring using datastax image and started filling the
db.
>>>>>> The cluster seems un-balanced.
>>>>>>
>>>>>> nodetool ring returns:
>>>>>> Address         DC          Rack        Status State   Load
>>>>>>  Owns    Token
>>>>>>
>>>>>>          113427455640312821154458202477256070485
>>>>>> 10.34.158.33    us-east     1c          Up     Normal  514.29 KB
>>>>>>   33.33%  0
>>>>>> 10.38.175.131   us-east     1c          Up     Normal  1.5 MB
>>>>>>  33.33%  56713727820156410577229101238628035242
>>>>>> 10.116.83.10    us-east     1c          Up     Normal  1.5 MB
>>>>>>  33.33%  113427455640312821154458202477256070485
>>>>>>
>>>>>> [default@tok] describe;
>>>>>> Keyspace: tok:
>>>>>>   Replication Strategy: org.apache.cassandra.locator.SimpleStrategy
>>>>>>   Durable Writes: true
>>>>>>     Options: [replication_factor:2]
>>>>>>
>>>>>> [default@tok] describe cluster;
>>>>>> Cluster Information:
>>>>>>    Snitch: org.apache.cassandra.locator.Ec2Snitch
>>>>>>    Partitioner: org.apache.cassandra.dht.RandomPartitioner
>>>>>>    Schema versions:
>>>>>>         4687d620-7664-11e1-0000-1bcb936807ff: [10.38.175.131,
>>>>>> 10.34.158.33, 10.116.83.10]
>>>>>>
>>>>>>
>>>>>> Any idea what is the cause?
>>>>>> I am running similar code on local ring and it is balanced.
>>>>>>
>>>>>> How can I fix this?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> *Tamar Fraenkel *
>>>>>> Senior Software Engineer, TOK Media
>>>>>>
>>>>>> [image: Inline image 1]
>>>>>>
>>>>>> tamar@tok-media.com
>>>>>> Tel:   +972 2 6409736
>>>>>> Mob:  +972 54 8356490
>>>>>> Fax:   +972 2 5612956
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> With kind regards,
>>>
>>> Robin Verlangen
>>> www.robinverlangen.nl
>>>
>>>
>>
>

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