How do I backup my Cassandra database?
Cassandra backs up data by taking a snapshot of all on-disk data files (SSTable files) stored in the data directory.
- About snapshots.
- Taking a snapshot.
- Deleting snapshot files.
- Enabling incremental backups.
- Restoring from a snapshot.
- Restoring a snapshot into a new cluster.
- Recovering from a single disk failure using JBOD.
Is Datastax and Cassandra same?
It is a NoSQL database written in Java that provides unique utilities that can’t be matched by the other NoSQL databases. On the other hand, DataStax is basically a database platform that is based on Apache Cassandra. It has been designed to meet the availability and performance demands of mobile, web, and IoT apps.
What is Cassandra backup?
Backups in Apache Cassandra database are backup copies of the database data that is stored as SSTable files. Backups are used for several purposes including the following: To store a data copy for durability. To be able to restore a table if table data is lost due to node/partition/network failure.
How do I incremental backup in Cassandra?
By default, incremental backup is disabled in Cassandra. This can be enabled by changing the value of “incremental_backups” to “true” in the cassandra. yaml file. Once enabled, Cassandra creates a hard link to each memtable flushed to SSTable to a backup’s directory under the keyspace data directory.
What does Nodetool Clearsnapshot do?
Removes one or more snapshots. Removes one or all snapshots. Warning: This command deletes the backup (snapshot) copy of your node.
How do I restore Cassandra?
Restoring from local nodes
- Make sure the table schema exists.
- If necessary, truncate the table.
- Locate the most recent snapshot folder.
- Copy the most recent snapshot SSTable directory to the data_directory/ keyspace / table_name – UUID directory.
- Run nodetool refresh and restart your nodes.
Is Cassandra DataStax free?
The DataStax ‘Ops Center’ product is available in a free version, which can run against any Cassandra with the associated ‘DataStax Agent’ used to collect data from each node.
Is Cassandra free for commercial use?
Cassandra is a free and open-source, distributed, wide-column store, NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.
What is Cassandra architecture?
Cassandra was designed to handle big data workloads across multiple nodes without a single point of failure. It has a peer-to-peer distributed system across its nodes, and data is distributed among all the nodes in a cluster.
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 do I create a Cassandra snapshot?
Snapshots are taken per node using the nodetool snapshot command. To take a global snapshot, run the nodetool snapshot command using a parallel ssh utility, such as pssh. A snapshot first flushes all in-memory writes to disk, then makes a hard link of the SSTable files for each keyspace.
What is Nodetool cleanup?
cleanup [ ] – triggers the immediate removal of data from node(s) that “lose” part of their token range due to a range movement operation (node addition or node replacement).
How does Cassandra back up data?
Cassandra backs up data by taking a snapshot of all on-disk data files (SSTable files) stored in the data directory. A brief description of how Cassandra backs up data.
How do I restore from a snapshot in Cassandra?
When incremental backups are enabled, Cassandra hard-links each memtable flushed t oan SSTable to a backups directory under the keyspace data directory. Methods for restoring from a snapshot. Steps for restoring a snapshot by recovering the cluster into another newly created cluster. Recovering from a single disk failure in a disk array using JBOD.
How does compaction work in Cassandra?
The compaction process merges keys, combines columns, evicts tombstones, consolidates SSTables, and creates a new index in the merged SSTable. Compression maximizes the storage capacity of Cassandra nodes by reducing the volume of data on disk and disk I/O, particularly for read-dominated workloads. Enabling write survey mode.