Jon Haddad created CASSANDRA-8868: ------------------------------------- Summary: 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 fullest disks are chosen to be the origin. SStables are selected from the origin disks, and compacted onto the receiver. This should both minimize seeks as well as auto balance. 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)