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From aaron morton <aa...@thelastpickle.com>
Subject Re: Storing Counters in Hive
Date Tue, 20 Mar 2012 17:21:58 GMT
What version are you using ?

IIRC not all versions of the Hive driver support counters. 

Cheers

-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 20/03/2012, at 1:09 PM, Sunit Randhawa wrote:

> I am trying to store Counters CF from cassandra to Hive. Below is the CREATE TABLE syntax
in Hive:
> 
> DROP TABLE IF EXISTS Counters;
> create external table Counters(row_key string, column_name string, value string)
> STORED BY 'org.apache.hadoop.hive.cassandra.CassandraStorageHandler'
> WITH SERDEPROPERTIES ("cassandra.columns.mapping" = ":key,:column,:value",
>   "cassandra.ks.name" = "BAMSchema",
>   "cassandra.ks.repfactor" = "1",
>   "cassandra.ks.strategy" = "org.apache.cassandra.locator.SimpleStrategy",
>   "cassandra.cf.name" = "Counters" ,
>   "cassandra.host" = "127.0.0.1" ,
>   "cassandra.port" = "9160",
>   "cassandra.partitioner" = "org.apache.cassandra.dht.RandomPartitioner")
> TBLPROPERTIES (
>   "cassandra.input.split.size" = "64000",
>   "cassandra.range.size" = "1000",
>   "cassandra.slice.predicate.size" = "1000"); 
> 
> and Counter CF is defined as :
> 
> create column family Counters
>         with comparator = UTF8Type
>         and default_validation_class=CounterColumnType 
>       and replicate_on_write=true;
> 
> 
> I am not able to import the Counter value in Hive. I am getting other row_key and column_name
properly.
> 
> 
> Below is the output from Hive:
> 
> hive> select * from Counters;
> OK
> 213_debit_1326690000    1-sess_count    d
> 213_debit_1326690000    1-total_db_time    
> 213_debit_1326690000    1-total_exec_time    
> 213_debit_1326690000    1-txn_count    
> 213_debit_1326690000    2-sess_count    
> 213_debit_1326690000    2-total_db_time    
> 213_debit_1326690000    2-total_exec_time    
> 213_debit_1326690000    2-txn_count    
> Time taken: 0.263 seconds
> 
> 
> Below is output from Cassandra:
> 
> [default@BAMSchema] list Counters;
> Using default limit of 100
> -------------------
> RowKey: 213_debit_1326690000
> => (counter=1-sess_count, value=100)
> => (counter=1-total_db_time, value=20)
> => (counter=1-total_exec_time, value=30)
> => (counter=1-txn_count, value=1)
> => (counter=2-sess_count, value=30)
> => (counter=2-total_db_time, value=30)
> => (counter=2-total_exec_time, value=30)
> => (counter=2-txn_count, value=1)
> 
> 
> As you can see that "d" junk letter is getting added in Hive when import happens from
Cassandra to Hive. Wondering what am I missing.
> 
> Thanks for your help!
> 


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