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doc: update the warning about shared dictionary training

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This commit updates the inadequate warning on the Advanced Internode (RPC) Compression page.

The warning is replaced with a note about how training data is encrypted.

Fixes https://github.com/scylladb/scylladb/issues/29109

Closes scylladb/scylladb#29111

(cherry picked from commit 88b98fac3a)

Closes scylladb/scylladb#29119

Closes scylladb/scylladb#29139

Closes scylladb/scylladb#29199
This commit is contained in:
Anna Stuchlik
2026-03-18 17:44:18 +01:00
committed by Avi Kivity
parent 95e8c6fd56
commit fa59daad49
1 changed files with 4 additions and 5 deletions
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9
docs/operating-scylla/procedures/config-change/advanced-internode-compression.rst
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@@ -57,12 +57,11 @@ To enable shared dictionaries:
internode_compression_enable_advanced: true
rpc_dict_training_when: when_leader
.. warning:: Enabling shared dictionary training might leak unencrypted data to disk.
.. note::
Trained dictionaries contain randomly chosen samples of data transferred between
nodes. The data samples are persisted in the Raft log, which is not encrypted.
As a result, some data from otherwise encrypted tables might be stored on disk
unencrypted.
Some dictionary training data may be encrypted using storage-level encryption
(if enabled) instead of database-level encryption, meaning protection is
applied at the storage layer rather than within the database itself.
Reference