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From "Jon Haddad (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-8868) JBOD Aware Size Tiered Compaction Strategy
Date Thu, 26 Feb 2015 17:41:04 GMT
Jon Haddad created CASSANDRA-8868:

             Summary: JBOD Aware Size Tiered Compaction Strategy
                 Key: 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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