What is Nodetool compact?
Forces a major compaction on one or more tables. Forces a major compaction on one or more tables.
What are the benefits of using Nodetool?
Simple Things You Can Learn From Cassandra Nodetool (Monitor/Manage) For DC/OS
- CASSANDRA CLUSTER STATUS.
- MONITOR CASSANDRA CLUSTER SINGLE NODE INFO.
- MONITOR CLUSTER STATISTICS OF KEYSPACES AND TABLES.
- MONITOR CLUSTER DISK SPACE RECLAIM.
- MONITOR CLUSTER THREADS AND PENDING PROCESS.
- MONITOR CLUSTER THREADS AND PENDING PROCESS.
What is Nodetool cleanup?
Triggers immediate cleanup of keyspaces that no longer belong to a node. Triggers immediate cleanup of keyspaces that no longer belong to a node. OpsCenter provides a Cleanup option in the Nodes UI for Running cleanup.
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 is Nodetool repair?
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 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. Square brackets indicate optional parameters.
How does Nodetool repair work?
It is run by the operator via nodetool. The repair command only repairs token ranges on the node being repaired, it doesn’t repair the whole cluster. By default, repair will operate on all token ranges replicated by the node you’re running repair on, which will cause duplicate work if you run it on every node.
How do I run Nodetool repair?
It is run by the operator via nodetool.
- Incremental repair is the default and is run with the following command: nodetool repair.
- A full repair can be run with the following command: nodetool repair –full.
- Additionally, repair can be run on a single keyspace:
- Or even on specific tables:
What is compaction 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 does Nodetool rebuild do?
Rebuilds data on a node by streaming from another datacenter. Rebuilds data on a node by streaming from another datacenter. This command operates on a single node where the command is run.
Why compaction is needed in Cassandra?
What is Cassandra compaction?
What is the actual output of compaction history?
The actual output of compaction history is seven columns wide. The first three columns show the id, keyspace name, and table name of the compacted SSTable.
What is separated options in compaction history?
Separates an option from an argument that could be mistaken for a option. The actual output of compaction history is seven columns wide. The first three columns show the id, keyspace name, and table name of the compacted SSTable.
How do I use compaction in DTCs?
For DTCS, using -s has no effect; a single file is still created. Run compaction on an entire keyspace or specified tables; use a space to separate table names. Run compaction on one or more SSTables. Specify the relative paths and file names. If you do not specify a keyspace or table, a major compaction is run on all keyspaces and tables.
How does a major compaction work?
If you do not specify a keyspace or table, a major compaction is run on all keyspaces and tables. If you specify only a keyspace, a major compaction is run on all tables in that keyspace. If you specify one or more tables, a major compaction is run on those tables.