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From Anand Somani <>
Subject Problems Iterating over tokens in > 0.7.5
Date Tue, 05 Jul 2011 15:23:09 GMT

Using thrift and get_range_slices call with tokenrange. Using Random
Partionioner. Have only tried this on > 0.7.5
Used to work in 0.6.4 or earlier version for me , but I notice that it does
not work for me anymore. The need is to iterate over a token range to do
some bookkeeping.
The logic is use

   1. TokenRange from describe_ring
   2. and then for each range
   1. set the start and end token
      2. get a batch of rows using get_range_slices
      3. Then use the last token from the batch to set the start_token and
      repeat (get the next batch). iterate until no more to get (or
last from new
      batch is same as last from previous batch)

Now this works when in a test I insert n records and then for iterating use
a batch size m such that m > n. As soon as I use m < n, I get incorrect
count or an infinite loop where the range seems to repeat.

Anybody seen this issue or am I using it incorrectly for newer versions of
cassandra? I will also look up how this is done in Hector, but in the
meantime if somebody has seen this behavior, please do respond.


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