reduce checks

weed/storage/volume_read.go

@@ -165,16 +165,8 @@ func (v *Volume) readNeedleDataInto(n *needle.Needle, readOption *ReadOption, wr
 		toWrite := min(count, int(offset+size-x))
 		if toWrite > 0 {
 			crc = crc.Update(buf[0:toWrite])
-			// the crc.Value() function is to be deprecated. this double checking is for backward compatibility
-			// with seaweed version using crc.Value() instead of uint32(crc), which appears in commit 056c480eb
-			// and switch appeared in version 3.09.
-			if offset == 0 && size == int64(n.DataSize) && int64(count) == size && (n.Checksum != crc && uint32(n.Checksum) != crc.Value()) {
-				// This check works only if the buffer is big enough to hold the whole needle data
-				// and we ask for all needle data.
-				// Otherwise we cannot check the validity of partially aquired data.
-				stats.VolumeServerHandlerCounter.WithLabelValues(stats.ErrorCRC).Inc()
-				return fmt.Errorf("ReadNeedleData checksum %v expected %v for Needle: %v,%v", crc, n.Checksum, v.Id, n)
-			}
+			// Note: CRC validation happens after the loop completes (see below)
+			// to avoid performance overhead in the hot read path
 			if _, err = writer.Write(buf[0:toWrite]); err != nil {
 				return fmt.Errorf("ReadNeedleData write: %w", err)
 			}