I get a lot of exceptions when using Pig scripts over Cassandra. I have to launch them again and again until they work. You can find a sample of the stacks when it works (twice) and when it fails (3 times) at http://pastebin.com/yWsTHbix. I use the following sample script (there are only a few lines) :

data = LOAD 'cql://ks1/lc' USING CqlStorage();
describe data;
dump data;
rows  = FOREACH data GENERATE filtre;
dump rows;
describe rows;

any idea or a way to get ride of them ?