Cassandra: Nodetool showing "?" in Owns

Question

I wonder why nodetools don't know the percentage of the ring handeld by my node...

I created this keyspace with

CREATE KEYSPACE mykeyspace WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '3'} AND durable_writes = true;

Someone has a clue?

Overprint

How many nodes do you have in your cluster? Is it just the one? – Figwort

Answer 1

okay got it. I have to specify a keyspace!

nodetool status mykeyspace

does the trick

Overprint

Yup...should've just said that :P – Detent

Answer 2

Do you get this at the bottom?

Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless

Do you have an opscenter / other keyspaces with different replication settings? In which case, ownership is "meaningless", and what you get is a ?

Detent

jep you are right...that's what it says! What is it trying to tell me? – Overprint

Remember cassandra data is distributed across the nodes in the cluster. If all keyspaces have the same replication settings, then you can say node X own 25% of the data (or 30% or 10%...). However, if the replication settings across the keyspaces are different, there's no longer an "equal" distribution of data. A node may have data from one keyspace, or another with different replication parameters. As such, a figure like 25% doesn't mean anything - it might be coz replication's not working, or coz the node is "serving" little from a keyspace. Hence the message and the "?". – Detent

Answer 3

These steps helped me. Kill the demon and restart Casansdra.

nodetool status ERROR>>

Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless

Kill cansandra demon. nodetool stopdemon systemctl status cassandra systemctl start cassandra nodetool status Good [root@ip-10-0-1-10 centos]# cqlsh localhost

Hiers