Contents
What does Nodetool repair does?
Repairs one or more tables. The repair command repairs one or more nodes in a cluster, and provides options for restricting repair to a set of nodes, see Repairing nodes. Performing an anti-entropy node repair on a regular basis is important, especially in an environment that deletes data frequently.
What are Cassandra hints?
Hints. Hinting is a data repair technique applied during write operations. Cassandra partitions data across the cluster using consistent hashing, and then replicates keys to multiple nodes along the hash ring.
What does compaction mean in Cassandra?
Cassandra Compaction is a process of reconciling various copies of data spread across distinct SSTables. Cassandra performs compaction of SSTables as a background activity. Cassandra has to maintain fewer SSTables and fewer copies of each data row due to compactions improving its read performance.
What is Cassandra compaction?
Which is optional in Nodetool repair-DataStax?
All nodetool repair arguments are optional. To restrict the repair to the local datacenter, use the -dc option followed by the name of the datacenter. Issue the command from a node in the datacenter you want to repair. Issuing the command from a datacenter other than the named one returns an error.
Is there a command to repair a node?
The repair command repairs one or more nodes in a cluster, and provides options for restricting repair to a set of nodes, see Repairing nodes . Performing an anti-entropy node repair on a regular basis is important, especially in an environment that deletes data frequently.
When to run an incremental repair in Nodetool?
Runs an incremental repair, which persists already repaired data and calculates only the Merkle trees for SSTables that have not been repaired. Requires repairs to be run frequently (daily). Before running an incremental repair for the first time, perform migration steps migration steps first.
How to restrict nodetool repair to local datacenter?
Separates an option from an argument that could be mistaken for a option. All nodetool repair arguments are optional. To restrict the repair to the local datacenter, use the -dc option followed by the name of the datacenter. Issue the command from a node in the datacenter you want to repair.