Hello Abdul,
Adding to what Bowen already shared for snapshots.
Assuming that you're not just amplifying disk space by updating\deleting
existing data many times, these are the following things that you should
consider:
* Manual snapshots
* Check (nodetool listsnapshots) and remove (nodetool clearsnapshot)
unwanted snapshots
* Automatic snapshots
* You can have unwanted snapshots if auto snapshot is enabled and you're
frequently dropping, trucating or scrubbing tables. Check if that is the case
* Incremental backups
* Check if you have enabled incremental backups. Those files do not get
deleted on their own and need to be cleaned out regularly
* Not running cleanup after adding new nodes to the cluster
* Check if you have recently added nodes to the cluster and missed
running cleanups after that
* Compaction failing due to low disk space
* Cassandra will not be able to compact data (and free up space) if it
does not have the required disk space to rewrite files. Check system.log for
compaction error
Thanks,
Dipan Shah
________________________________
From: Bowen Song <bo...@bso.ng>
Sent: Friday, September 17, 2021 4:53 PM
To: user@cassandra.apache.org <user@cassandra.apache.org>
Subject: Re: High disk usage casaandra 3.11.7
Assuming your total disk space is a lot bigger than 50GB in size
(accounting for disk space amplification, commit log, logs, OS data,
etc.), I would suspect the disk space is being used by something else.
Have you checked that the disk space is actually being used by the
cassandra data directory? If so, have a look at 'nodetool listsnapshots'
command output as well.
On 17/09/2021 05:48, Abdul Patel wrote:
> Hello
>
> We have cassandra with leveledcompaction strategy, recently found
> filesystem almost 90% full but the data was only 10m records.
> Manual compaction will work? As not sure its recommended and space is
> also constraint ..tried removing and adding one node and now data is
> at 20GB which looks appropropiate.
> So is only solution to reclaim space is remove/add node?
