Jordan West created CASSANDRA-14499:
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             Summary: 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


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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