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[#1143] shard: Introduce explicit Degraded mode

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`Degraded` mode is set automatically after error counter is over the
threshold. `ReadOnly` mode can still be set by an administrator.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgenii Stratonikov 2022-03-17 14:55:25 +03:00 • committed by fyrchik
parent 9eb70c18c3
commit 6472a170eb
21 changed files with 62 additions and 24 deletions
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9
pkg/local_object_storage/writecache/mode.go
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@ -14,6 +14,9 @@ const (
// ModeReadOnly is a mode in which write-cache doesn't flush anything to a metabase.
ModeReadOnly
// ModeDegraded is similar to a shard's degraded mode.
ModeDegraded
)
// ErrReadOnly is returned when Put/Write is performed in a read-only mode.
@ -50,3 +53,9 @@ func (c *cache) SetMode(m Mode) {
time.Sleep(time.Second)
}
}
// readOnly returns true if current mode is read-only.
// `c.modeMtx` must be taken.
func (c *cache) readOnly() bool {
return c.mode != ModeReadWrite
}