ddaed283e9
1. Remove in-memory cache. It doesn't persist objects and if we want more speed, `NoSync` option can be used for the bolt DB. 2. Put to the metabase in a synchronous fashion. This considerably simplifies overall logic and plays nicely with the metabase bolt DB batch settings. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package writecache
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard/mode"
|
|
)
|
|
|
|
// ErrReadOnly is returned when Put/Write is performed in a read-only mode.
|
|
var ErrReadOnly = errors.New("write-cache is in read-only mode")
|
|
|
|
// SetMode sets write-cache mode of operation.
|
|
// When shard is put in read-only mode all objects in memory are flushed to disk
|
|
// and all background jobs are suspended.
|
|
func (c *cache) SetMode(m mode.Mode) error {
|
|
c.modeMtx.Lock()
|
|
defer c.modeMtx.Unlock()
|
|
|
|
if m.ReadOnly() == c.readOnly() {
|
|
c.mode = m
|
|
return nil
|
|
}
|
|
|
|
if c.db != nil {
|
|
if err := c.db.Close(); err != nil {
|
|
return fmt.Errorf("can't close write-cache database: %w", err)
|
|
}
|
|
c.db = nil
|
|
}
|
|
|
|
// Suspend producers to ensure there are channel send operations in fly.
|
|
// flushCh is populated by `flush` with `modeMtx` taken, thus waiting until it is empty
|
|
// guarantees that there are no in-fly operations.
|
|
for len(c.flushCh) != 0 {
|
|
c.log.Info("waiting for channels to flush")
|
|
time.Sleep(time.Second)
|
|
}
|
|
|
|
if err := c.openStore(m.ReadOnly()); err != nil {
|
|
return err
|
|
}
|
|
|
|
c.mode = m
|
|
return nil
|
|
}
|
|
|
|
// readOnly returns true if current mode is read-only.
|
|
// `c.modeMtx` must be taken.
|
|
func (c *cache) readOnly() bool {
|
|
return c.mode.ReadOnly()
|
|
}
|