Storage proxy will give you the total writes through the server, for all CFs.
CommitLog thread pool is not what you want. It's not designed to measure the
column or row throughput, it's just how many tasks have run through the thread
pool.
The closest thing to recording the number of columns i
Thanks for the quick replies guys!
Just to explain to you why I wanted to understand these two measures, I do
batch inserts to Cassandra but the batches are not fixed in size i.e. the
number of columns in a batch varies and also the data type of the values
placed in the columns varies (the name of
The OpsCenter graph you're referring to basically does the following:
1. For each node, find out how much the WriteOperations attribute of the
StorageProxy increased during the last minute.
2. Sum these values to get a total for the cluster.
3. Divide by 60 to get an average number of WriteOperati
Its the number of mutations, a mutation is a collection of changes for a single
row across one or more column families.
Take a look at the nodetool cfstats, this is where I assume Ops Centre is
getting it's data from.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaro
Hello everyone,
I was trying to get some cluster wide statistics of the total insertions
performed in my 3 node Cassandra 0.8.6 cluster. So I wrote a nice little
program that gets the CompletedTasks attribute of
org.apache.cassandra.db:type=Commitlog from every node, sums up the values
and records
