I tried that and found that it cannot handle large file at present.
But you can write a tool according to it.
eg: first sorting your data file according to it's hash key; second, write to a SSTable directly

On Fri, Apr 16, 2010 at 4:47 AM, Lee Parker <lee@socialagency.com> wrote:
Has anyone used json2sstable to migrate a large amount of data into cassandra?  What was your methodology?  I assume that this will be much faster than stepping through my data and doing writes via PHP/Thrift.

Lee Parker