I have started understanding and working with cassandra recently.
I have created two Column Families. For CF1, a write is an insert into a unique row with all column values. Eg: Sequence of insert operations could be like this :
Key Col1 Col2 Col3
k1 c11 c12 c13
k2 c21 c22 c23
For CF2. a write is an insert into a time stamped column of a row. Eg: Sequence of insert operations could be like this :
Key timeCol1 timeCol2
k1 ct11
k1 ct11 ct12
k2 ct21
k2 ct21 ct22
I am using YCSB and using thrift based client.batch_mutate() call. For CF1, i send all column vals for a row through the call. For CF2, i send the new column vals for a row.
Now say opscenter reports the "write requests" as say 1000 operations/sec when a record count is say 10000 records.
What does an operation mean from opscenter perspective? Does it mean unique row inserts across all column families ? Does it mean count of each mutations for a row ? How does opscenter identify a unique operation ? From application perspective an operation means differently for both column families.
Can some one guide me ?
Thanks, Arun