forked from TrueCloudLab/frostfs-node
[#1908] docs: Describe SIGHUP behaviour
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
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docs/sighup.md
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# SIGHUP behaviour
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## Logger
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Logger level can be reloaded with a SIGHUP.
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## Storage engine
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Shards can be added, removed or reloaded with SIGHUP.
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Each shard from the configuration is matched with existing shards by
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comparing paths from `shard.blobstor` section. After this we have 3 sets:
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1. Shards that are missing from the configuration (or have `mode: disabled`) but are currently open.
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These are closed.
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2. Shards that are added. These are opened and initialized.
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3. Shards that remain in the configuration.
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For these shards we apply reload to a `metabase` only. If `resync_metabase` is true, the metabase is also resynchronized.
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### Metabase
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| Changed section | Actions |
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|-----------------|----------------------------------------------------------------------------------------------------------------------|
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| `path` | If `path` is different, metabase is closed and opened with a new path. All other configuration will also be updated. |
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