Please don’t cross-post multiple lists.
Datastax list removed
Abishek, do you have auth enabled? Does the system auth keyspace have rf=3?
--
Jeff Jirsa
> On Feb 27, 2018, at 2:59 AM, Nicolas Guyomar <nicolas.guyo...@gmail.com>
> wrote:
>
> Hi,
>
> Adding the java-driver ML for further question, because this does look like a
> bug
>
> Are you able to reproduce it a clean environnement using the same C* version
> and driver version ?
>
>
>> On 27 February 2018 at 10:05, Abhishek Kumar Maheshwari
>> <abhishek.maheshw...@timesinternet.in> wrote:
>> Hi Alex,
>>
>> i have only One DC (with name DC1) and have only one keyspace. So i dont
>> think so both of the scenario is possible. (yes in my case QUORUM is
>> equivalent of ALL)
>>
>> cqlsh> SELECT * FROM system_schema.keyspaces where keyspace_name='adlog' ;
>>
>> keyspace_name | durable_writes | replication
>> ---------------+----------------+-------------------------------------------------------------------------------
>> adlog | True | {'DC1': '2', 'class':
>> 'org.apache.cassandra.locator.NetworkTopologyStrategy'}
>>
>>
>>> On Tue, Feb 27, 2018 at 2:27 PM, Oleksandr Shulgin
>>> <oleksandr.shul...@zalando.de> wrote:
>>>> On Tue, Feb 27, 2018 at 9:45 AM, Abhishek Kumar Maheshwari
>>>> <abhishek.maheshw...@timesinternet.in> wrote:
>>>>
>>>> i have a KeySpace in Cassandra (cassandra version 3.0.9- total 12 Servers
>>>> )With below definition:
>>>>
>>>> {'DC1': '2', 'class':
>>>> 'org.apache.cassandra.locator.NetworkTopologyStrategy'}
>>>>
>>>> Some time i am getting below exception
>>>>
>>>
>>> [snip]
>>>> Caused by: com.datastax.driver.core.exceptions.WriteTimeoutException:
>>>> Cassandra timeout during write query at consistency QUORUM (3 replica were
>>>> required but only 2 acknowledged the write)
>>>> at
>>>> com.datastax.driver.core.exceptions.WriteTimeoutException.copy(WriteTimeoutException.java:100)
>>>> at
>>>> com.datastax.driver.core.Responses$Error.asException(Responses.java:134)
>>>> at
>>>> com.datastax.driver.core.RequestHandler$SpeculativeExecution.onSet(RequestHandler.java:525)
>>>> at
>>>> com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:1077)
>>>>
>>>> why its waiting for acknowledged from 3rd server as replication factor is
>>>> 2?
>>>
>>> I see two possibilities:
>>>
>>> 1) The data in this keyspace is replicated to another DC, so there is also
>>> 'DC2': '2', for example, but you didn't show it. In this case QUORUM
>>> requires more than 2 nodes.
>>> 2) The write was targeting a table in a different keyspace than you think.
>>>
>>> In any case QUORUM (or LOCAL_QUORUM) with RF=2 is equivalent of ALL. Not
>>> sure why would you use it in the first place.
>>>
>>> For consistency levels involving quorum you want to go with RF=3 in a
>>> single DC. For multi DC you should think if you want QUORUM or EACH_QUORUM
>>> for your writes and figure out the RFs from that.
>>>
>>> Cheers,
>>> --
>>> Alex
>>>
>>
>>
>>
>> --
>> Thanks & Regards,
>> Abhishek Kumar Maheshwari
>> +91- 9999805591 (Mobile)
>>
>> Times Internet Ltd. | A Times of India Group Company
>>
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>
