Do I need to run compaction on each node of the cluster in cassandra 3

1
votes

We are having 4 node cassandra cluster . Do I need to run compact and repair on each node of the cluster ?

Cassandra Version:- Cassandra 3.0.10 No of nodes in a cluster : 4 Replication Factor :- 4 Compaction Strategy:- LeveledCompactionStrategy

Thanks

2
cassandradatastaxcassandra-3.0
Just curious, but why a RF of 4? That means only one node can go down before you start seeing issues querying at QUORUM. - Aaron
We have distribution of 4 nodes in 2 data centers. 2 nodes in 1 datacenter and 2 nodes in another. Also the data size is small so we have RF as 4 - user1097437

2 Answers

3
votes

To answer the question, "Yes" compaction needs to run on all nodes.

The right answer, is that you shouldn't be the one running compaction. Cassandra is almost always capable of figuring out when to run compaction on its own, and you should not need to invoke it manually.

In fact, once you run compaction manually, the odds of compaction happening organically in the future are minuscule, so then you're stuck having to do it manually.

Similar answer on DBA.StackExchange: https://dba.stackexchange.com/questions/71781/cassandra-maintenance/74213#74213

1
votes

Yep, compaction is done automatically, but you should run a regular repair