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https://issues.apache.org/jira/browse/CASSANDRA-14499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508496#comment-16508496
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Jeff Jirsa commented on CASSANDRA-14499:
----------------------------------------
{quote}
You need to recognize as an operator that your nodes are full and add more
nodes to your cluster, or add more disk space to your cluster.
{quote}
Even the best operators can't always add disk/instances fast enough to avoid
running a cluster 100% out of space in some cases, and if/when that happens,
you end up in a situation where you have no good options, perhaps a few "ok"
options (block client connections and expand, maybe), but plenty of bad options
(removing commitlogs, etc).
This isn't entirely new ground here, there's precedent elsewhere. Hadoop has
{{dfs.datanode.du.reserved}} per disk, for example.
> node-level disk quota
> ---------------------
>
> Key: CASSANDRA-14499
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14499
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Jordan West
> Assignee: Jordan West
> Priority: Major
>
> Operators should be able to specify, via YAML, the amount of usable disk
> space on a node as a percentage of the total available or as an absolute
> value. If both are specified, the absolute value should take precedence. This
> allows operators to reserve space available to the database for background
> tasks -- primarily compaction. When a node reaches its quota, gossip should
> be disabled to prevent it taking further writes (which would increase the
> amount of data stored), being involved in reads (which are likely to be more
> inconsistent over time), or participating in repair (which may increase the
> amount of space used on the machine). The node re-enables gossip when the
> amount of data it stores is below the quota.
> The proposed option differs from {{min_free_space_per_drive_in_mb}}, which
> reserves some amount of space on each drive that is not usable by the
> database.
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