[jira] Commented: (CASSANDRA-1906) Sanitize configuration code

["Jon Hermes (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-1906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993670#comment-12993670 ] 

Jon Hermes commented on CASSANDRA-1906:
---------------------------------------

CFS has started to accumulate Default<T>s for settings that can be changed at runtime for per-node settings (min/max compaction threshold, and mem size/ops/time (soon row/key cache save period CASSANDRA-2100)). If we want to keep these ephemeral (non-migration) changes, then Tables (KSs) and StorageService (Global per-node settings) should follow in suit, and there should be one for every config option that doesn't impact the cluster (i.e. changing the saved_caches dir/ = Good, changing the partitioner or token ephemerally = bad).

This reduces it to three paths:
- Read from cassandra.yaml for SS settings at boot time,
- Read from the schema and accept migrations to the schema for permanent KS/CF settings,
- Change any per-node value at runtime in SS/Table/CFS,
... and the first and third may well be combined for a scant two _code_ paths (compare to current 4+ code paths) separated by the permanent/non-permanent taxonomy.

> Sanitize configuration code
> ---------------------------
>
>                 Key: CASSANDRA-1906
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1906
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jon Hermes
>            Assignee: Jon Hermes
>            Priority: Minor
>             Fix For: 0.8
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Multipart:
> - Drop deprecated YAML config. Only config allowed is via thrift/JMX. Make this gratuitously easy to do with sane defaults and accepting changesets as opposed to full definitions.
> - Combine common code between KS/CF/ColumnDefs and between thrift/avro defs.
> - Provide an obvious and clean interface for changing settings locally versus globally (JMX vs. thrift). Dox here.

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