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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package db
import (
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
"github.com/weaviate/weaviate/usecases/sharding"
)
func (i *Index) checkSingleShardMigration(shardState *sharding.State) error {
res, err := os.ReadDir(i.Config.RootPath)
if err != nil {
return err
}
for _, entry := range res {
if !strings.HasPrefix(entry.Name(), i.ID()+"_single") {
// either not part of this index, or not a "_single" shard
continue
}
// whatever is left now, needs to be migrated
shards := shardState.AllPhysicalShards()
if len(shards) != 1 {
return errors.Errorf("cannot migrate '_single' shard into config with %d "+
"desired shards", len(shards))
}
shardName := shards[0]
newName := i.ID() + "_" + shardName + strings.TrimPrefix(entry.Name(), i.ID()+"_single")
oldPath := filepath.Join(i.Config.RootPath, entry.Name())
newPath := filepath.Join(i.Config.RootPath, newName)
if err := os.Rename(oldPath, newPath); err != nil {
return errors.Wrapf(err, "migrate shard %q to %q", oldPath, newPath)
}
i.logger.WithField("action", "index_startup_migrate_shards_successful").
WithField("old_shard", oldPath).
WithField("new_shard", newPath).
Infof("successfully migrated shard file %q (created in an earlier version) to %q",
oldPath, newPath)
}
return nil
}
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