jackcasey-visier opened a new pull request #1148: URL: https://github.com/apache/cassandra/pull/1148
*These changes are a current WIP* # Summary This functionality allows users of Cassandra to remove snapshots ad-hoc, based on a TTL. This is to address the problem of snapshots accumulating. For example, an organization I work for aims to keep snapshots for 30 days, however we don't have any way to easily clean them after those 30 days are up. This is similar to the goals set in: https://issues.apache.org/jira/browse/CASSANDRA-16451 however would be available for Cassandra 3.x. # Functionality This adds a new command to NodeTool, called `expiresnapshot` with the following options: ``` NAME nodetool expiresnapshots - Removes snapshots that are older than a TTL in days SYNOPSIS nodetool [(-h <host> | --host <host>)] [(-p <port> | --port <port>)] [(-pw <password> | --password <password>)] [(-pwf <passwordFilePath> | --password-file <passwordFilePath>)] [(-u <username> | --username <username>)] expiresnapshots [--dry-run] (-t <ttl> | --ttl <ttl>) OPTIONS --dry-run Run without actually clearing snapshots -h <host>, --host <host> Node hostname or ip address -p <port>, --port <port> Remote jmx agent port number -pw <password>, --password <password> Remote jmx agent password -pwf <passwordFilePath>, --password-file <passwordFilePath> Path to the JMX password file -t <ttl>, --ttl <ttl> TTL (in days) to expire snapshots -u <username>, --username <username> Remote jmx agent username ``` The snapshot date is taken by converting the default snapshot name timestamps (epoch time in miliseconds). For this reason, snapshot names that don't contain a timestamp in this format will not be cleared. # Example Use This Cassandra environment has a number of snapshots, a few are recent, and a few outdated: ``` root@cassandra001:/cassandra# nodetool listsnapshots Snapshot Details: Snapshot name Keyspace name Column family name True size Size on disk 1529173922063 users_keyspace users 362.03 KiB 362.89 KiB 1629173909461 users_keyspace users 362.03 KiB 362.89 KiB 1629173922063 users_keyspace users 362.03 KiB 362.89 KiB 1599173922063 users_keyspace users 362.03 KiB 362.89 KiB 1629173916816 users_keyspace users 362.03 KiB 362.89 KiB Total TrueDiskSpaceUsed: 1.77 MiB ``` To validate the removal runs as expected, we can use the `--dry-run` option: ``` root@cassandra001:/cassandra# nodetool expiresnapshots --ttl 30 --dry-run Starting simulated cleanup of snapshots older than 30 days Clearing (dry run): 1529173922063 Clearing (dry run): 1599173922063 Cleared (dry run): 2 snapshots ``` Now that we are confident the correct snapshots will be removed, we can omit the `--dry-run` flag: ``` root@cassandra001:/cassandra# nodetool expiresnapshots --ttl 30 Starting cleanup of snapshots older than 30 days Clearing: 1529173922063 Clearing: 1599173922063 Cleared: 2 snapshots ``` To confirm our changes are successful, we list the snapshots that still remain: ``` root@cassandra001:/cassandra# nodetool listsnapshots Snapshot Details: Snapshot name Keyspace name Column family name True size Size on disk 1629173909461 users_keyspace users 362.03 KiB 362.89 KiB 1629173922063 users_keyspace users 362.03 KiB 362.89 KiB 1629173916816 users_keyspace users 362.03 KiB 362.89 KiB Total TrueDiskSpaceUsed: 1.06 MiB ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
