// Write apply the given batch to the DB. The batch will be applied
// sequentially.
//
// It is safe to modify the contents of the arguments after Write returns.
func (d *DB) Write(b *Batch, wo *opt.WriteOptions) (err error) {
err = d.ok()
if err != nil || b == nil || b.len() == 0 {
return
}
b.init(wo.GetSync())
// The write happen synchronously.
select {
case _, _ = <-d.closeCh:
return ErrClosed
case d.writeCh <- b:
return <-d.writeAckCh
case d.writeLockCh <- struct{}{}:
}
merged := 0
defer func() {
<-d.writeLockCh
for i := 0; i < merged; i++ {
d.writeAckCh <- err
}
}()
mem, err := d.flush()
if err != nil {
return
}
// Calculate maximum size of the batch.
m := 1 << 20
if x := b.size(); x <= 128<<10 {
m = x + (128 << 10)
}
// Merge with other batch.
drain:
for b.size() <= m && !b.sync {
select {
case nb := <-d.writeCh:
b.append(nb)
merged++
default:
break drain
}
}
// Set batch first seq number relative from last seq.
b.seq = d.seq + 1
// Write journal concurrently if it is large enough.
if b.size() >= (128 << 10) {
// Push the write batch to the journal writer
select {
case _, _ = <-d.closeCh:
err = ErrClosed
return
case d.journalCh <- b:
// Write into memdb
b.memReplay(mem)
}
// Wait for journal writer
select {
case _, _ = <-d.closeCh:
err = ErrClosed
return
case err = <-d.journalAckCh:
if err != nil {
// Revert memdb if error detected
b.revertMemReplay(mem)
return
}
}
} else {
err = d.doWriteJournal(b)
if err != nil {
return
}
b.memReplay(mem)
}
// Set last seq number.
d.addSeq(uint64(b.len()))
return
}
// Write apply the given batch to the DB. The batch will be applied
// sequentially.
//
// It is safe to modify the contents of the arguments after Write returns.
func (db *DB) Write(b *Batch, wo *opt.WriteOptions) (err error) {
err = db.ok()
if err != nil || b == nil || b.len() == 0 {
return
}
b.init(wo.GetSync())
// The write happen synchronously.
retry:
select {
case db.writeC <- b:
if <-db.writeMergedC {
return <-db.writeAckC
}
goto retry
case db.writeLockC <- struct{}{}:
case _, _ = <-db.closeC:
return ErrClosed
}
merged := 0
defer func() {
<-db.writeLockC
for i := 0; i < merged; i++ {
db.writeAckC <- err
}
}()
mem, memFree, err := db.flush(b.size())
if err != nil {
return
}
// Calculate maximum size of the batch.
m := 1 << 20
if x := b.size(); x <= 128<<10 {
m = x + (128 << 10)
}
m = minInt(m, memFree)
// Merge with other batch.
drain:
for b.size() < m && !b.sync {
select {
case nb := <-db.writeC:
if b.size()+nb.size() <= m {
b.append(nb)
db.writeMergedC <- true
merged++
} else {
db.writeMergedC <- false
break drain
}
default:
break drain
}
}
// Set batch first seq number relative from last seq.
b.seq = db.seq + 1
// Write journal concurrently if it is large enough.
if b.size() >= (128 << 10) {
// Push the write batch to the journal writer
select {
case _, _ = <-db.closeC:
err = ErrClosed
return
case db.journalC <- b:
// Write into memdb
b.memReplay(mem)
}
// Wait for journal writer
select {
case _, _ = <-db.closeC:
err = ErrClosed
return
case err = <-db.journalAckC:
if err != nil {
// Revert memdb if error detected
b.revertMemReplay(mem)
return
}
}
} else {
err = db.writeJournal(b)
if err != nil {
return
}
b.memReplay(mem)
}
// Set last seq number.
db.addSeq(uint64(b.len()))
if b.size() >= memFree {
db.rotateMem(0)
}
return
}