[ https://issues.apache.org/jira/browse/CASSANDRA-8868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14338774#comment-14338774 ]
Jonathan Ellis commented on CASSANDRA-8868: ------------------------------------------- I think this is going to be obsoleted RSN by CASSANDRA-6696. > JBOD Aware Size Tiered Compaction Strategy > ------------------------------------------ > > Key: CASSANDRA-8868 > URL: https://issues.apache.org/jira/browse/CASSANDRA-8868 > Project: Cassandra > Issue Type: New Feature > Components: Core > Reporter: Jon Haddad > Priority: Minor > Attachments: jbod_aware.png > > > I'd like to propose a new compaction strategy targeting JBOD configurations. > I believe this strategy would be most useful to machines with 4+ spinning > disks but would also see some benefit on SSDs. > There are a several goals with this strategy: > 1. Minimize disk seeks during the compaction process > 2. Maximize disk throughput when multiple disks are present > 3. Better data distribution across disks. Data should automatically be > balanced (applies when adding a new, empty disk) > When a compaction is to occur, the algorithm first selects a disk to be the > receiver. This disk should be the one with the most free space. The disks > with the least free space should then be chosen as the origin disks. > SStables are selected from the origin disks, and compacted to the receiver. > This should both minimize seeks as well as auto balance data across disks. > I'm not sure if this would apply to leveled compaction, but it may apply to > date tiered. -- This message was sent by Atlassian JIRA (v6.3.4#6332)