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From Everton Lima <peitin.inu...@gmail.com>
Subject Re: SchemaDisagreementException
Date Mon, 19 Nov 2012 12:53:50 GMT
I was using cassandra direct because it has more performace than using CQL.
Therefore, I am using cassandra because of replication factor and
consistence of data. I am using it as a lib of my app. I only make sample
querys, just use a key to point to a data.

2012/11/16 Everton Lima <peitin.inutil@gmail.com>

> I do that because I need to create a dynamic column families.
> I create 2 keyspaces in  the start of application, using embedded
> cassandra instance too, but it's never throw exception. And than, insert
> dynamic column families in this 2 keyspaces.
>
> I put a "Thread.sleep(3000);" in the middle of the creation column family
> code.
>
>             int watiTime = 3000;
>             logger.info("Waiting "+(watiTime/1000)+"s for synchronizing
> ...");
>             Thread.sleep(watiTime);
>             CassandraHelper.createColumnFamily(CassandraHelper.KEYSPACE,
> layer);
>             logger.info("Waiting "+(watiTime/1000)+"s for synchronizing
> ...");
>             Thread.sleep(watiTime);
>
> I do that, because in the code of CassandraStress, after create a column
> family, it do that too. It is wrong or good solution?
> Any other idea?
>
>
>
> 2012/11/14 aaron morton <aaron@thelastpickle.com>
>
>> Out of interest why are you creating column families by making direct
>> calls on an embedded cassandra instance ? I would guess you life would be
>> easier if you defined a schema in CQL or CLI.
>>
>>
>> I already read in the documentation that this error occurs when more than
>> one thread/processor access the same place in the Cassandra, but I think
>> this is not occuring.
>>
>> How may nodes do you have ?
>>
> I am using 3 nodes.
>
>> What version are you running ?
>>
> The version is 1.1.6
>
>> It sounds like you have run simultaneous schema updates and the global
>> schema has diverged.
>>
>> If you can create your schema in CLI or CQL I would recommend doing that.
>> If you are trying to do something more complicated you'll need to provide
>> more information.
>>
>> Cheers
>>
>>
>>   -----------------
>> Aaron Morton
>> Freelance Cassandra Developer
>> New Zealand
>>
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 15/11/2012, at 3:13 AM, Everton Lima <peitin.inutil@gmail.com> wrote:
>>
>> Some times, when I try to insert a data in Cassandra with Method:
>>
>> static void createColumnFamily(String keySpace, String columnFamily){
>>  synchronized (mutex){
>>   Iface cs = new CassandraServer();
>>   CfDef cfDef = new CfDef(keySpace, columnFamily);
>>
>>   cfDef = cfDef.setComparator_type(comparator.toString());
>>   cfDef = cfDef.setKey_validation_class(UTF8Type.class.getName());
>>   cfDef = cfDef.setCaching("all");
>>
>>   cs.set_keyspace(keySpace);
>>   cs.system_add_column_family(cfDef);
>>  }
>> }
>>
>> I run this method in only on process of the distributor system. But in
>> this process, I run the method two times consecutive in the same thread,
>> but with keyspace diferent.
>> I already read in the documentation that this error occurs when more than
>> one thread/processor access the same place in the Cassandra, but I think
>> this is not occuring.
>> Some one cold help me to understand this problem?
>>
>> Thanks.
>>
>> --
>>
>> Everton Lima Aleixo
>> Bacharel em Ciencia da Computação
>> Universidade Federal de Goiás
>>
>>
>>
>
>
> --
>
> Everton Lima Aleixo
> Bacharel em Ciencia da Computação
> Universidade Federal de Goiás
>



-- 

Everton Lima Aleixo
Bacharel em Ciencia da Computação
Universidade Federal de Goiás

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