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Do not use write-cache as a read cache: always remove objects from the WC, not only if an object hasn't been used for some time (LRU cache is dropped). Use object size (in bytes) as a metric of used space, not an approximate (and too inaccurate) maximum stored objects number. Signed-off-by: Pavel Karpy <p.karpy@yadro.com>
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package writecache
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import (
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"fmt"
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"os"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/fstree"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
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"go.etcd.io/bbolt"
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)
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// smallStore represents persistent storage with in-memory LRU cache
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// for flushed items on top of it.
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type smallStore struct {
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db *bbolt.DB
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}
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const dbName = "small.bolt"
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func (c *Cache) openStore(readOnly bool) error {
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err := util.MkdirAllX(c.path, os.ModePerm)
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if err != nil {
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return err
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}
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c.db, err = OpenDB(c.path, readOnly, c.openFile)
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if err != nil {
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return fmt.Errorf("could not open database: %w", err)
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}
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c.db.MaxBatchSize = c.maxBatchSize
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c.db.MaxBatchDelay = c.maxBatchDelay
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if !readOnly {
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err = c.db.Update(func(tx *bbolt.Tx) error {
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_, err := tx.CreateBucketIfNotExists(defaultBucket)
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return err
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})
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if err != nil {
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return fmt.Errorf("could not create default bucket: %w", err)
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}
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}
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c.fsTree = fstree.New(
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fstree.WithPath(c.path),
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fstree.WithPerm(os.ModePerm),
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fstree.WithDepth(1),
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fstree.WithDirNameLen(1),
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fstree.WithNoSync(c.noSync))
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if err = c.fsTree.Open(readOnly); err != nil {
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return fmt.Errorf("could not open FSTree: %w", err)
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}
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return nil
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}
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