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https://issues.apache.org/jira/browse/CASSANDRA-16860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507724#comment-17507724
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Jack Casey commented on CASSANDRA-16860:
----------------------------------------
Hi [~smiklosovic]!
Sorry for being a ghost, life has become pretty busy for me over the past few
months and I've had a hard go finding time to work on this 😅
I'll do my best to find some time over the next week or two to jump back on
this, however if there's anyone that'd be interesting in collaborating that'd
be a great help!Â
Thanks for checking in! :)Â
Â
Â
> Add --older-than option to nodetool clearsnapshot
> -------------------------------------------------
>
> Key: CASSANDRA-16860
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16860
> Project: Cassandra
> Issue Type: New Feature
> Components: Local/Snapshots, Tool/nodetool
> Reporter: Jack Casey
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 4.x
>
>
> h1. Summary
> Opening this issue in reference to [this WIP
> PR|https://github.com/apache/cassandra/pull/1148]:
> 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.
> h1. 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.
> h1. 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
> h1. Next Steps
> To be completed:
> - Tests
> - Documentation updates
> I am a new to this repository, and am fuzzy on a few details even after
> reading the contribution guide 😅 Any advice on the following would be greatly
> appreciated!
> - What branch would this type of change be merged into? Currently, I'm
> targeting {{apache:trunk}} by default
> - Is there a test strategy/pattern for this type of change? I was not able
> to find any existing tests for similar {{nodetool}} commands
> Thanks! 😄
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