This has been brought up in a few tickets, so pushing to the dev list.
CASSANDRA-15234 - Standardise config and JVM parameters
CASSANDRA-16896 - hard/soft limits for queries
CASSANDRA-17147 - Guardrails prototype
In short, do we as a project wish to move "new features" into nested
YAML when the feature has "enough" to justify the nesting? I would
really like to focus this discussion on new features rather than
retroactively grouping (leaving that to CASSANDRA-15234), as there is
already a place to talk about that.
To get things started, let's start with the track-warning feature
(hard/soft limits for queries), currently the configs look as follows
(assuming 15234)
track_warnings:
enabled: true
coordinator_read_size:
warn_threshold: 10kb
abort_threshold: 1mb
local_read_size:
warn_threshold: 10kb
abort_threshold: 1mb
row_index_size:
warn_threshold: 100mb
abort_threshold: 1gb
or should this be "flat"
track_warnings_enabled: true
track_warnings_coordinator_read_size_warn_threshold: 10kb
track_warnings_coordinator_read_size_abort_threshold: 1mb
track_warnings_local_read_size_warn_threshold: 10kb
track_warnings_local_read_size_abort_threshold: 1mb
track_warnings_row_index_size_warn_threshold: 100mb
track_warnings_row_index_size_abort_threshold: 1gb
For me I prefer nested for a few reasons
* easier to enforce consistency as the configs can use shared types;
in the track warnings patch I had mismatches cross configs (warn vs
warns, fail vs abort, etc.) before going nested, now everything reuses
the same types
* even though it is longer, things can be more clear how they are related
* parsing layer can add support for mixed or purely flat depending on
user preference (example:
track_warnings.row_index_size.abort_threshold, using the '.' notation
to represent nested structures)
Thoughts?
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