[ https://issues.apache.org/jira/browse/CASSANDRA-1906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993670#comment-12993670 ]
Jon Hermes edited comment on CASSANDRA-1906 at 2/11/11 8:08 PM: ---------------------------------------------------------------- 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 max_hint_window ephemerally = Good, changing the partitioner or token ephemerally = Bad/impossible). 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. was (Author: jhermes): 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. -- This message is automatically generated by JIRA. - For more information on JIRA, see: http://www.atlassian.com/software/jira