4944490ffb
`Degraded` mode can be set by the administrator if needed. Modifying operations in this mode can lead node into an inconsistent state because metabase checks such as lock checking are not performed. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
package mode
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// Mode represents enumeration of Shard work modes.
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type Mode uint32
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const (
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// ReadWrite is a Mode value for shard that is available
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// for read and write operations. Default shard mode.
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ReadWrite Mode = 0
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// DegradedReadOnly is a Mode value for shard that is set automatically
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// after a certain number of errors is encountered. It is the same as
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// `mode.ReadOnly` but also enables fallback algorithms for getting object
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// in case metabase is corrupted.
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DegradedReadOnly = Degraded | ReadOnly
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)
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const (
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// ReadOnly is a Mode value for shard that does not
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// accept write operation but is readable.
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ReadOnly Mode = 1 << iota
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// Degraded is a Mode value for shard when the metabase is unavailable.
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// It is hard to perform some modifying operations in this mode, thus it can only be set by an administrator.
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Degraded
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)
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func (m Mode) String() string {
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switch m {
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default:
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return "UNDEFINED"
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case ReadWrite:
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return "READ_WRITE"
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case ReadOnly:
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return "READ_ONLY"
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case Degraded:
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return "DEGRADED"
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case DegradedReadOnly:
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return "DEGRADED_READ_ONLY"
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}
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}
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// NoMetabase returns true iff m is operating without the metabase.
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func (m Mode) NoMetabase() bool {
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return m&Degraded != 0
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}
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// ReadOnly returns true iff m prohibits modifying operations with shard.
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func (m Mode) ReadOnly() bool {
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return m&ReadOnly != 0
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}
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