Hadoop/Cassandra for data transformation (rather than analysis)?

2013-08-10 Thread Jan Algermissen
Hi, I have a specific use case to address with Cassandra and I can't get my head around whether using Hadoop on top creates any significant benefit or not. Situation: I have product data and each product 'contains' a number of articles (100 / product), representing individual colors/sizes

Custom data type class in pycassa

2013-08-10 Thread Vladimir Prudnikov
Hi all, I use pycassa and I want to store lists and tuples in cassandra by serializing them using MessagePack. Seems like custom data type is what I need. Here is data type I created: ## class MyListType(CassandraType): @staticmethod def pack(value):

Handling quorum writies fails

2013-08-10 Thread Mikhail Tsaplin
Hi. According to Datastax documentation about atomicity in Cassandra: QUORUM write succeeded only on one node will not be rolled back (Check Atomicity chapter there: http://www.datastax.com/documentation/cassandra/1.2/webhelp/index.html#cassandra/dml/dml_about_transactions_c.html). So when I am