Why does Cassandra’s compaction use my C partition if the database is located on a different disk?

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We have configured Cassandra to run on a separate D drive but noticed that during compaction, it also uses a lot of space of our C partition, where we have the OS and DataMiner. Because the C partition has less space, we wonder about any action to prevent this situation...

Gelber Mahecha [SLC] [DevOps Enabler] Selected answer as best 13th October 2020

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During compaction, there should not be extra writes to drive C, unless Cassandra needs memory and Windows starts using a page file.

If correctly configured to have Cassandra on an separate drive D, drive C should only be used for:

  • Commit logs (where Cassandra temporarily saves new data)
  • Hint files (used for synchronization with other Cassandra nodes, such as on a Failover system)

Both of these are unrelated to compaction.

Wouter Demuynck [SLC] [DevOps Enabler] Answered question 12th October 2020
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