forked from TrueCloudLab/frostfs-node
e9461686b8
If operation with WC are _fast enough_ (e.g. `Init` failed and `Close` is called immediately) there is a race and a deadlock that do not allow finish (and start, in fact) an initialization routine because of taken `modeMtx` and also do not allow finish `Close` call because of awaiting initialization finish. So do stop initialization _before_ any mutex is taken. Signed-off-by: Pavel Karpy <p.karpy@yadro.com>
94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
package writecache
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import (
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"context"
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"fmt"
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"time"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/pkg/tracing"
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"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
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"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/trace"
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)
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// ErrReadOnly is returned when Put/Write is performed in a read-only mode.
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var ErrReadOnly = logicerr.New("write-cache is in read-only mode")
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// ErrNotInitialized is returned when write-cache is initializing.
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var ErrNotInitialized = logicerr.New("write-cache is not initialized yet")
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// SetMode sets write-cache mode of operation.
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// When shard is put in read-only mode all objects in memory are flushed to disk
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// and all background jobs are suspended.
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func (c *cache) SetMode(m mode.Mode) error {
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ctx, span := tracing.StartSpanFromContext(context.TODO(), "writecache.SetMode",
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trace.WithAttributes(
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attribute.String("mode", m.String()),
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))
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defer span.End()
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return c.setMode(ctx, m)
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}
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// setMode applies new mode. Must be called with cache.modeMtx lock taken.
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func (c *cache) setMode(ctx context.Context, m mode.Mode) error {
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var err error
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turnOffMeta := m.NoMetabase()
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if !c.initialized.Load() {
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close(c.stopInitCh)
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c.initWG.Wait()
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c.stopInitCh = make(chan struct{})
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defer func() {
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if err == nil && !turnOffMeta {
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c.initFlushMarks(ctx)
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}
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}()
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}
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c.modeMtx.Lock()
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defer c.modeMtx.Unlock()
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if turnOffMeta && !c.mode.NoMetabase() {
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err = c.flush(ctx, true)
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if err != nil {
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return err
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}
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}
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if c.db != nil {
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if err = c.db.Close(); err != nil {
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return fmt.Errorf("can't close write-cache database: %w", err)
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}
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}
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// Suspend producers to ensure there are channel send operations in fly.
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// flushCh is populated by `flush` with `modeMtx` taken, thus waiting until it is empty
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// guarantees that there are no in-fly operations.
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for len(c.flushCh) != 0 {
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c.log.Info(logs.WritecacheWaitingForChannelsToFlush)
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time.Sleep(time.Second)
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}
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if turnOffMeta {
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c.mode = m
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return nil
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}
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if err = c.openStore(m.ReadOnly()); err != nil {
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return err
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}
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c.mode = m
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return nil
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}
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// readOnly returns true if current mode is read-only.
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// `c.modeMtx` must be taken.
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func (c *cache) readOnly() bool {
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return c.mode.ReadOnly()
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}
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