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frostfs-node/docs/sighup.md
Evgenii Stratonikov a189eca5d5 [#1908] docs: Describe SIGHUP behaviour 
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
2022-10-24 13:28:26 +03:00

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SIGHUP behaviour

Logger

Logger level can be reloaded with a SIGHUP.

Storage engine

Shards can be added, removed or reloaded with SIGHUP. Each shard from the configuration is matched with existing shards by comparing paths from shard.blobstor section. After this we have 3 sets:

  1. Shards that are missing from the configuration (or have mode: disabled) but are currently open. These are closed.
  2. Shards that are added. These are opened and initialized.
  3. Shards that remain in the configuration. For these shards we apply reload to a metabase only. If resync_metabase is true, the metabase is also resynchronized.

Metabase

Changed section Actions
path If path is different, metabase is closed and opened with a new path. All other configuration will also be updated.