Thanks! will do. Tamar *Tamar Fraenkel * Senior Software Engineer, TOK Media
[image: Inline image 1]
ta...@tok-media.com
Tel: +972 2 6409736
Mob: +972 54 8356490
Fax: +972 2 5612956
On Thu, Mar 29, 2012 at 12:11 PM, Shimi Kiviti <shim...@gmail.com> wrote:
> You set the consistency with every request.
> Usually a client library will let you set a default one for all write/read
> requests.
> I don't know if Hector lets you set a default consistency level per CF.
> Take a look at the Hector docs or ask it in the Hector mailing list.
>
> Shimi
>
>
> On Thu, Mar 29, 2012 at 11:47 AM, Tamar Fraenkel <ta...@tok-media.com>wrote:
>
>> Can this be set on a CF basis.
>> Only this CF needs higher consistency level.
>> Thanks,
>> Tamar
>>
>> *Tamar Fraenkel *
>> Senior Software Engineer, TOK Media
>>
>> [image: Inline image 1]
>>
>> ta...@tok-media.com
>> Tel: +972 2 6409736
>> Mob: +972 54 8356490
>> Fax: +972 2 5612956
>>
>>
>>
>>
>>
>> On Thu, Mar 29, 2012 at 10:44 AM, Shimi Kiviti <shim...@gmail.com> wrote:
>>
>>> Like everything else in Cassandra, If you need full consistency you need
>>> to make sure that you have the right combination of (write consistency
>>> level) + (read consistency level)
>>>
>>> if
>>> W = write consistency level
>>> R = read consistency level
>>> N = replication factor
>>> then
>>> W + R > N
>>>
>>> Shimi
>>>
>>>
>>> On Thu, Mar 29, 2012 at 10:09 AM, Tamar Fraenkel <ta...@tok-media.com>wrote:
>>>
>>>> Hi!
>>>> Asking again, as I didn't get responses :)
>>>>
>>>> I have a ring with 3 nodes and replication factor of 2.
>>>> I have counter cf with the following definition:
>>>>
>>>> CREATE COLUMN FAMILY tk_counters
>>>> with comparator = 'UTF8Type'
>>>> and default_validation_class = 'CounterColumnType'
>>>> and key_validation_class = 'CompositeType(UTF8Type,UUIDType)'
>>>> and replicate_on_write = true;
>>>>
>>>> In my code (Java, Hector), I increment a counter and then read it.
>>>> Is it possible that the value read will be the value before increment?
>>>> If yes, how can I ensure it does not happen. All my reads and writes
>>>> are done with consistency level one.
>>>> If this is consistency issue, can I do only the actions on tk_counters
>>>> column family with a higher consistency level?
>>>> What does replicate_on_write mean? I thought this should help, but
>>>> maybe even if replicating after write, my read happen before
>>>> replication finished and it returns value from a still not updated
>>>> node.
>>>>
>>>> My increment code is:
>>>> Mutator<Composite> mutator =
>>>> HFactory.createMutator(keyspace,
>>>> CompositeSerializer.get());
>>>> mutator.incrementCounter(key,"tk_counters", columnName, inc);
>>>> mutator.execute();
>>>>
>>>> My read counter code is:
>>>> CounterQuery<Composite,String> query =
>>>> createCounterColumnQuery(keyspace,
>>>> CompositeSerializer.get(), StringSerializer.get());
>>>> query.setColumnFamily("tk_counters");
>>>> query.setKey(key);
>>>> query.setName(columnName);
>>>> QueryResult<HCounterColumn<String>> r = query.execute();
>>>> return r.get().getValue();
>>>>
>>>> Thanks,
>>>> *Tamar Fraenkel *
>>>> Senior Software Engineer, TOK Media
>>>>
>>>> [image: Inline image 1]
>>>>
>>>> ta...@tok-media.com
>>>> Tel: +972 2 6409736
>>>> Mob: +972 54 8356490
>>>> Fax: +972 2 5612956
>>>>
>>>>
>>>>
>>>>
>>>
>>
>
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<<tokLogo.png>>
