Questions：How to improve write speed to cassandra

[waittingsummer]

I have massive data writing requirements, but also a certain need to read
Now kairsodb + cassandra

RF=3 RL=QUORUM WL=QUORUM
The problem is that data often piles up in the queue directory

[brianhks]

So if the queue is growing that means sending data to cassandra is not keeping up. One thing to check is if your cache is working correctly. Check this metric and group by table: kairosdb.datastore.cassandra.write_batch_size.sum
This depends greatly on your data you are sending in. If the metric names and tags are a fixed or limited set then the cache if big enough should prevent writing to any other table but data_points. The metric will reveal what is going on.

[MujeerAhmed]

@waittingsummer you can increase the IOPS of your mounted volumes. I remember facing this same issue as well, and consider migrating to ScyllaDB. Kairos works just as good with Scylla as it does with Cassandra.