redict/src/commands/config-rewrite.json
Oran Agra 41e6e05dee
Allow most CONFIG SET during loading, block some commands in async-loading (#9878)
## background
Till now CONFIG SET was blocked during loading.
(In the not so distant past, GET was disallowed too)

We recently (not released yet) added an async-loading mode, see #9323,
and during that time it'll serve CONFIG SET and any other command.
And now we realized (#9770) that some configs, and commands are dangerous
during async-loading.

## changes
* Allow most CONFIG SET during loading (both on async-loading and normal loading)
* Allow CONFIG REWRITE and CONFIG RESETSTAT during loading
* Block a few config during loading (`appendonly`, `repl-diskless-load`, and `dir`)
* Block a few commands during loading (list below)

## the blocked commands:
* SAVE - obviously we don't wanna start a foregreound save during loading 8-)
* BGSAVE - we don't mind to schedule one, but we don't wanna fork now
* BGREWRITEAOF - we don't mind to schedule one, but we don't wanna fork now
* MODULE - we obviously don't wanna unload a module during replication / rdb loading
  (MODULE HELP and MODULE LIST are not blocked)
* SYNC / PSYNC - we're in the middle of RDB loading from master, must not allow sync
  requests now.
* REPLICAOF / SLAVEOF - we're in the middle of replicating, maybe it makes sense to let
  the user abort it, but he couldn't do that so far, i don't wanna take any risk of bugs due to odd state.
* CLUSTER - only allow [HELP, SLOTS, NODES, INFO, MYID, LINKS, KEYSLOT, COUNTKEYSINSLOT,
  GETKEYSINSLOT, RESET, REPLICAS, COUNT_FAILURE_REPORTS], for others, preserve the status quo

## other fixes
* processEventsWhileBlocked had an issue when being nested, this could happen with a busy script
  during async loading (new), but also in a busy script during AOF loading (old). this lead to a crash in
  the scenario described in #6988
2021-12-22 14:11:16 +02:00

18 lines
416 B
JSON

{
"REWRITE": {
"summary": "Rewrite the configuration file with the in memory configuration",
"complexity": "O(1)",
"group": "server",
"since": "2.8.0",
"arity": 2,
"container": "CONFIG",
"function": "configRewriteCommand",
"command_flags": [
"ADMIN",
"NOSCRIPT",
"LOADING",
"STALE"
]
}
}