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List:       cassandra-user
Subject:    Cassandra on ZFS: disable compression?
From:       Lapo Luchini <lapo () lapo ! it>
Date:       2021-01-25 15:06:12
Message-ID: rummp5$14e9$1 () ciao ! gmane ! io
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Hi,
     I'm using a fairly standard install of Cassandra 3.11 on FreeBSD 
12, by default filesystem is compressed using LZ4 and Cassandra tables 
are compressed using LZ4 as well.

I was wondering if anybody had data about this already (or else, I will 
probably do some tests myself, eventually): would it be a nice idea to 
disable Cassandra compression and rely only on ZFS one?

In principle I can see some pros:
1. it's done in kernel, might be slightly faster
2. can (probably) compress more data, as I see a 1.02 compression factor
    on filesystem even if I have compressed data in tables already
3. in upcoming ZFS version I will be able to use Zstd compression
    (probably before Cassandra 4.0 is gold)
4. (can inspect  compression directly at filesystem level)

But on the other hand application-level compression could have its 
advantages.

cheers,

-- 
Lapo Luchini
lapo@lapo.it


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