Firstly, thanks for clarifying all my doubts raised so far.
Today while using, cassandra-stress tool to write several thousand records to node, the process aborted in- between and got error message that java run time environment got crashed.
And also, I am getting this error very frequently. Can you please give me permanent fix to this issue and my write query is half-way stopped, So, how to rolll back my commit-log to initial stage, so that I can run cassandra-stress again. Thanks in advance.