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[#1908] docs: Describe SIGHUP behaviour

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Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
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Evgenii Stratonikov 2022-10-16 14:39:31 +03:00 committed by fyrchik
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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. |