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apache / couchdb-ioq / refs/heads/cache-io-priority-encoding
commitf1b30789afc87f173e0935e14390d979706a3f7f[log] [tgz]
authorRussell Branca <chewbranca@apache.org>Fri Jun 06 13:37:36 2025 -0700
committerRussell Branca <chewbranca@apache.org>Fri Jun 06 13:37:36 2025 -0700
tree847e5f792f1059f96b2ffcf591946a790c8ecb5c
parentf051c7f0195ea4d124a80df117bdf702a937db98 [diff]
Fixup pdict usage
1 file changed
tree: 847e5f792f1059f96b2ffcf591946a790c8ecb5c
  1. include/
  2. priv/
  3. src/
  4. test/
  5. .gitignore
  6. IOQ2.md
  7. operator_guide.md
  8. README.md
  9. rebar.config
  10. rebar.config.script
README.md

IOQ classes

The following are the list of IOQ classes:

  • interactive
  • db_update
  • view_update
  • db_compact
  • view_compact
  • internal_repl
  • low

Bypassing IOQ

One can configure an ioq bypass, which removes an IO class from prioritization, as below:

config:set("ioq.bypass", "view_update", "true")

Note that setting an IOQ bypass can effectively trump all other classes, especially in the case of an interactive bypass v. compaction. This can lead to high disk usage.

Setting priorities

The priority for a class can also be set ala:

config:set("ioq", "compaction", "0.3")

Or globally, using snippet/rpc:

s:set_config("ioq", "compaction", "0.314", global)
rpc:multicall(config, set, ["ioq", "compaction", "0.217"])

As the interactive class is ‘everything else’ its priority cannot be directly set.