What is Nodetool cleanup?

What is Nodetool cleanup?

Cleans up keyspaces and partition keys no longer belonging to a node.

When should I run Nodetool cleanup?

You should run nodetool cleanup whenever you scale-out (expand) your cluster, and new nodes are added to the same DC. The scale out process causes the token ring to get re-distributed. As a result, some of the nodes will have replicas for tokens that they are no longer responsible for (taking up disk space).

What does Nodetool drain do?

On the Node which is going to be replaced, Run nodetool flush or nodetool drain. The difference between them is nodetool drain flushes memtables to SSTables on disk and then it stops listening for connections from the client and other nodes. The command nodetool drain is used when you want to upgrade the node.

What is Nodetool repair?

Repair – a process that runs in the background and synchronizes the data between nodes. When running nodetool repair on a single node, it acts as the repair master. Only the data contained in the master node and its replications will be repaired.

What is Nodetool repair in Cassandra?

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.

How do I check my Cassandra compaction status?

If you grep the cassandra log file for lines containing Compacting you will find the sstables that are part of a compaction. If you sum these sizes and multiply by the inverse of your compression ratio for the column family you will get pretty close to the total.

What is Nodetool in Cassandra?

The nodetool utility is a command line interface for Cassandra. You can use it to help manage a cluster. In binary installations, nodetool is located in the /bin directory. The nodetool utility provides commands for viewing detailed metrics for tables, server metrics, and compaction statistics.

How long does Nodetool drain take?

nodetool drain taking around 2 to 3 hours.

How do I check Nodetool status?

nodetool status

  1. Status – U (up) or D (down) Indicates whether the node is functioning or not.
  2. State – N (normal), L (leaving), J (joining), M (moving), or S (stopped) The state of the node in relation to the cluster.
  3. Address. The node’s URL.
  4. Load – updates every 90 seconds.
  5. Tokens.
  6. Owns.
  7. Host ID.
  8. Rack.

How do I check Nodetool repair status?

Generally speaking, you can monitor a nodetool repair operation with two nodetool commands:

  1. compactionstats.
  2. netstats.

How do I run Nodetool repair?

It is run by the operator via nodetool.

  1. Incremental repair is the default and is run with the following command: nodetool repair.
  2. A full repair can be run with the following command: nodetool repair –full.
  3. Additionally, repair can be run on a single keyspace:
  4. Or even on specific tables:

How do I change my compaction strategy in Cassandra?

Update a table to set the compaction strategy using the ALTER TABLE statement. Change the compaction strategy property to SizeTieredCompactionStrategy and specify the minimum number of SSTables to trigger a compaction using the CQL min_threshold attribute.