Is there any row key partition limit in KairosDB

Question

KairosDB built in top of cassandra, but the cassandra have row key partition limit, Is that partition limit is applicable to this also?

Answer 1

Yes, it has the same limitation -- in the Getting Started section you can read what follows:

Using with Cassandra [...]

The default configuration for Cassandra is to use wide rows. Each row is set to contain 3 weeks of data. The reason behind setting it to 3 weeks is if you wrote a metric every millisecond for 3 weeks it would be just over 1 billion columns. Cassandra has a 2 billion column limit.

HTH, Carlo

Answer 2

we already discussedvia the kairosDB discussion group, but you raise an interesting question here.

I am sure that if you come over 2^64 you will have much more problems than the index capability of Cassandra. Imagine you're only using 1 byte per series, that means 1.84e19 bytes... Only Google or facebook know yet how to store 18 exabytes, which is a cosmic size.