forked from TrueCloudLab/frostfs-node
[#1806] engine: Allow to flush write-cache
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
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commit
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2 changed files with 69 additions and 0 deletions
33
pkg/local_object_storage/engine/writecache.go
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33
pkg/local_object_storage/engine/writecache.go
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package engine
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import (
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
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)
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// FlushWriteCachePrm groups the parameters of FlushWriteCache operation.
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type FlushWriteCachePrm struct {
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shardID *shard.ID
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}
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// SetShardID is an option to set shard ID.
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//
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// Option is required.
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func (p *FlushWriteCachePrm) SetShardID(id *shard.ID) {
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p.shardID = id
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}
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// FlushWriteCacheRes groups the resulting values of FlushWriteCache operation.
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type FlushWriteCacheRes struct{}
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// FlushWriteCache flushes write-cache on a single shard.
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func (e *StorageEngine) FlushWriteCache(p FlushWriteCachePrm) (FlushWriteCacheRes, error) {
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e.mtx.RLock()
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sh, ok := e.shards[p.shardID.String()]
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e.mtx.RUnlock()
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if !ok {
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return FlushWriteCacheRes{}, errShardNotFound
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}
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return FlushWriteCacheRes{}, sh.FlushWriteCache()
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}
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36
pkg/local_object_storage/shard/writecache.go
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36
pkg/local_object_storage/shard/writecache.go
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package shard
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import (
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"errors"
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard/mode"
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)
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// errWriteCacheDisabled is returned when an operation on write-cache is performed,
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// but write-cache is disabled.
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var errWriteCacheDisabled = errors.New("write-cache is disabled")
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// FlushWriteCache moves writecache in read-only mode and flushes all data from it.
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// After the operation writecache will remain read-only mode.
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func (s *Shard) FlushWriteCache() error {
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if !s.hasWriteCache() {
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return errWriteCacheDisabled
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}
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s.m.RLock()
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defer s.m.RUnlock()
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// To write data to the blobstor we need to write to the blobstor and the metabase.
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if s.info.Mode.ReadOnly() {
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return ErrReadOnlyMode
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}
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if s.info.Mode.NoMetabase() {
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return ErrDegradedMode
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}
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if err := s.writeCache.SetMode(mode.ReadOnly); err != nil {
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return err
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}
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return s.writeCache.Flush()
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}
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