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[#1085] writecache: add read-only mode

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In read-only mode modifying operations are immediately returned with
error and all background operations are suspended.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgenii Stratonikov 2022-01-18 15:47:16 +03:00 • committed by LeL
parent 9f963e001b
commit ad01aaf8bf
7 changed files with 139 additions and 28 deletions
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17
pkg/local_object_storage/writecache/flush.go
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@ -63,6 +63,13 @@ func (c *cache) flush() {
m = m[:0]
sz := 0
c.modeMtx.RLock()
if c.mode == ModeReadOnly {
c.modeMtx.RUnlock()
time.Sleep(time.Second)
continue
}
// We put objects in batches of fixed size to not interfere with main put cycle a lot.
_ = c.db.View(func(tx *bbolt.Tx) error {
b := tx.Bucket(defaultBucket)
@ -90,6 +97,7 @@ func (c *cache) flush() {
select {
case c.flushCh <- obj:
case <-c.closeCh:
c.modeMtx.RUnlock()
return
}
}
@ -98,6 +106,7 @@ func (c *cache) flush() {
for i := range m {
c.flushed.Add(m[i].addr, true)
}
c.modeMtx.RUnlock()
c.log.Debug("flushed items from write-cache",
zap.Int("count", len(m)),
@ -116,8 +125,13 @@ func (c *cache) flushBigObjects() {
for {
select {
case <-tick.C:
evictNum := 0
c.modeMtx.RLock()
if c.mode == ModeReadOnly {
c.modeMtx.RUnlock()
break
}
evictNum := 0
_ = c.fsTree.Iterate(func(addr *objectSDK.Address, data []byte) error {
sAddr := addr.String()
@ -150,6 +164,7 @@ func (c *cache) flushBigObjects() {
// evict objects which were successfully written to BlobStor
c.evictObjects(evictNum)
c.modeMtx.RUnlock()
case <-c.closeCh:
}
}