[WIP] Update deps

vendor/github.com/cockroachdb/pebble/sstable/options.go

@@ -5,6 +5,7 @@
 package sstable
 
 import (
+	"github.com/cockroachdb/fifo"
 	"github.com/cockroachdb/pebble/internal/base"
 	"github.com/cockroachdb/pebble/internal/cache"
 )
@@ -111,6 +112,11 @@ type ReaderOptions struct {
 	// The default cache size is a zero-size cache.
 	Cache *cache.Cache
 
+	// LoadBlockSema, if set, is used to limit the number of blocks that can be
+	// loaded (i.e. read from the filesystem) in parallel. Each load acquires one
+	// unit from the semaphore for the duration of the read.
+	LoadBlockSema *fifo.Semaphore
+
 	// User properties specified in this map will not be added to sst.Properties.UserProperties.
 	DeniedUserProperties map[string]struct{}
 

vendor/github.com/cockroachdb/pebble/sstable/reader.go

@@ -539,6 +539,15 @@ func (r *Reader) readBlock(
 	}
 
 	// Cache miss.
+
+	if sema := r.opts.LoadBlockSema; sema != nil {
+		if err := sema.Acquire(ctx, 1); err != nil {
+			// An error here can only come from the context.
+			return bufferHandle{}, err
+		}
+		defer sema.Release(1)
+	}
+
 	var compressed cacheValueOrBuf
 	if bufferPool != nil {
 		compressed = cacheValueOrBuf{
@@ -571,6 +580,7 @@ func (r *Reader) readBlock(
 			int(bh.Length+blockTrailerLen), readDuration.String())
 	}
 	if stats != nil {
+		stats.BlockBytes += bh.Length
 		stats.BlockReadDuration += readDuration
 	}
 	if err != nil {
@@ -628,9 +638,6 @@ func (r *Reader) readBlock(
 		decompressed = transformed
 	}
 
-	if stats != nil {
-		stats.BlockBytes += bh.Length
-	}
 	if decompressed.buf.Valid() {
 		return bufferHandle{b: decompressed.buf}, nil
 	}

vendor/github.com/cockroachdb/pebble/sstable/reader_iter_two_lvl.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 
 	"github.com/cockroachdb/pebble/internal/base"
+	"github.com/cockroachdb/pebble/objstorage/objstorageprovider"
 	"github.com/cockroachdb/pebble/objstorage/objstorageprovider/objiotracing"
 )
 
@@ -177,7 +178,7 @@ func (i *twoLevelIterator) init(
 		_ = i.topLevelIndex.Close()
 		return err
 	}
-	i.dataRH = r.readable.NewReadHandle(ctx)
+	i.dataRH = objstorageprovider.UsePreallocatedReadHandle(ctx, r.readable, &i.dataRHPrealloc)
 	if r.tableFormat >= TableFormatPebblev3 {
 		if r.Properties.NumValueBlocks > 0 {
 			i.vbReader = &valueBlockReader{