One question regarding point 2: Why should we always use Hector, Thrift is not
that bad?
Von meinem iPhone gesendet
Am 17.06.2011 um 17:12 schrieb Jonathan Ellis <jbel...@gmail.com>:
> 1. the right way to right that is to just say struct.name, struct.value, etc
> 2. why are you writing raw thrift instead of using Hector?
>
> On Fri, Jun 17, 2011 at 5:03 AM, Vivek Mishra
> <vivek.mis...@impetus.co.in> wrote:
>>
>>
>>
>>
>> From: Vivek Mishra
>> Sent: Friday, June 17, 2011 3:25 PM
>> To: user@cassandra.apache.org
>> Subject: getFieldValue()
>>
>>
>>
>> Hi,
>>
>> I was looking into getFieldValue method for SuperColumn and SlicePredicate
>> apis.
>>
>>
>>
>> It looks to me slight confusing as underlying APIs are returning Object and
>> developer can only be aware of type of object either by looking into
>> Cassandra code base or by ClassCastException.
>>
>>
>>
>> For example,
>>
>>
>>
>> I need to retrieve column name and it’s value for a SuperColumnFamily
>> “SuperCli” is:
>>
>>
>>
>>
>>
>> List<KeySlice> keySlices = cassndraClient.get_range_slices(new ColumnParent(
>>
>> "SuperCli"), slicePredicate, keyRange,
>> ConsistencyLevel.ONE);
>>
>> System.out.println(keySlices.size()
>>
>> + " No. of rows exist for the column family:" +
>> "SuperCli");
>>
>> for( KeySlice slice :keySlices)
>>
>> {
>>
>> city = "noida";
>>
>> System.out.println(new String((byte[])
>> (slice.getColumns().get(0).getSuper_column().getFieldValue(org.apache.cassandra.thrift.SuperColumn._Fields.NAME))).toString());
>>
>> }
>>
>>
>>
>>
>>
>> Am I doing something wrong or such typecasting is must? Shouldn’t we hide
>> this complexity and handle it implicitly in CASSANDRA? Or may be introducing
>> a Helper Class can reduce such amount of code ?
>>
>>
>>
>>
>>
>>
>>
>> Is it possible to retrieve a specific SuperColumn by specifying it’s value
>> in SliceRange query?
>>
>>
>>
>> I can’t see any method with such search API and I believe it is a real time
>> scenario.
>>
>>
>>
>> SuperCli is a super column family holding number of dynamic super columns.
>>
>>
>>
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>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com
