Jon Haddad created CASSANDRA-8868:
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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.
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