forked from Deuxfleurs/garage
[fix-buffering] change request sending strategy and fix priorities
remove LAS, priorize new requests but otherwise just do standard queuing
This commit is contained in:
parent
0d3e285d13
commit
85f580cbde
5 changed files with 80 additions and 45 deletions
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@ -238,10 +238,16 @@ impl BlockManager {
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async fn rpc_get_raw_block_streaming(
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&self,
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hash: &Hash,
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priority: RequestPriority,
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order_tag: Option<OrderTag>,
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) -> Result<DataBlockStream, Error> {
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self.rpc_get_raw_block_internal(hash, order_tag, |stream| async move { Ok(stream) })
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.await
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self.rpc_get_raw_block_internal(
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hash,
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priority,
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order_tag,
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|stream| async move { Ok(stream) },
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)
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.await
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}
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/// Ask nodes that might have a (possibly compressed) block for it
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@ -249,9 +255,10 @@ impl BlockManager {
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pub(crate) async fn rpc_get_raw_block(
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&self,
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hash: &Hash,
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priority: RequestPriority,
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order_tag: Option<OrderTag>,
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) -> Result<DataBlock, Error> {
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self.rpc_get_raw_block_internal(hash, order_tag, |block_stream| async move {
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self.rpc_get_raw_block_internal(hash, priority, order_tag, |block_stream| async move {
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let (header, stream) = block_stream.into_parts();
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read_stream_to_end(stream)
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.await
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@ -264,6 +271,7 @@ impl BlockManager {
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async fn rpc_get_raw_block_internal<F, Fut, T>(
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&self,
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hash: &Hash,
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priority: RequestPriority,
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order_tag: Option<OrderTag>,
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f: F,
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) -> Result<T, Error>
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@ -279,7 +287,7 @@ impl BlockManager {
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let rpc = self.endpoint.call_streaming(
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&node_id,
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BlockRpc::GetBlock(*hash, order_tag),
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PRIO_NORMAL | PRIO_SECONDARY,
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priority,
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);
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tokio::select! {
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res = rpc => {
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@ -331,7 +339,9 @@ impl BlockManager {
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hash: &Hash,
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order_tag: Option<OrderTag>,
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) -> Result<ByteStream, Error> {
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let block_stream = self.rpc_get_raw_block_streaming(hash, order_tag).await?;
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let block_stream = self
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.rpc_get_raw_block_streaming(hash, PRIO_NORMAL | PRIO_SECONDARY, order_tag)
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.await?;
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let (header, stream) = block_stream.into_parts();
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match header {
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DataBlockHeader::Plain => Ok(stream),
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@ -436,7 +436,7 @@ impl BlockResyncManager {
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&manager.endpoint,
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&need_nodes[..],
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put_block_message,
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RequestStrategy::with_priority(PRIO_BACKGROUND)
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RequestStrategy::with_priority(PRIO_BACKGROUND | PRIO_SECONDARY)
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.with_quorum(need_nodes.len()),
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)
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.await
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@ -460,7 +460,9 @@ impl BlockResyncManager {
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hash
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);
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let block_data = manager.rpc_get_raw_block(hash, None).await?;
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let block_data = manager
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.rpc_get_raw_block(hash, PRIO_BACKGROUND | PRIO_SECONDARY, None)
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.await?;
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manager.metrics.resync_recv_counter.add(1);
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@ -28,12 +28,30 @@ use crate::util::*;
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/// The same priority value is given to a request and to its associated response.
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pub type RequestPriority = u8;
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// Usage of priority levels in Garage:
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//
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// PRIO_HIGH
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// for liveness check events such as pings and important
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// reconfiguration events such as layout changes
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//
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// PRIO_NORMAL
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// for standard interactive requests to exchange metadata
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//
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// PRIO_NORMAL | PRIO_SECONDARY
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// for standard interactive requests to exchange block data
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//
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// PRIO_BACKGROUND
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// for background resync requests to exchange metadata
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// PRIO_BACKGROUND | PRIO_SECONDARY
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// for background resync requests to exchange block data
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/// Priority class: high
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pub const PRIO_HIGH: RequestPriority = 0x20;
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/// Priority class: normal
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pub const PRIO_NORMAL: RequestPriority = 0x40;
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/// Priority class: background
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pub const PRIO_BACKGROUND: RequestPriority = 0x80;
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/// Priority: primary among given class
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pub const PRIO_PRIMARY: RequestPriority = 0x00;
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/// Priority: secondary among given class (ex: `PRIO_HIGH | PRIO_SECONDARY`)
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@ -109,7 +109,7 @@ impl SendQueuePriority {
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let i = order_vec.iter().take_while(|o2| **o2 < order).count();
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order_vec.insert(i, order);
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}
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self.items.push_front(item);
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self.items.push_back(item);
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}
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fn remove(&mut self, id: RequestID) {
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if let Some(i) = self.items.iter().position(|x| x.id == id) {
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@ -128,51 +128,56 @@ impl SendQueuePriority {
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self.items.is_empty()
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}
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fn poll_next_ready(&mut self, ctx: &mut Context<'_>) -> Poll<(RequestID, DataFrame)> {
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for (j, item) in self.items.iter_mut().enumerate() {
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if let Some(OrderTag(stream, order)) = item.order_tag {
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if order > *self.order.get(&stream).unwrap().front().unwrap() {
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// in step 1: poll only streams that have sent 0 bytes, we want to send them in priority
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// as they most likely represent small requests to be sent first
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// in step 2: poll all streams
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for step in 0..2 {
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for (j, item) in self.items.iter_mut().enumerate() {
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if let Some(OrderTag(stream, order)) = item.order_tag {
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if order > *self.order.get(&stream).unwrap().front().unwrap() {
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continue;
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}
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}
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if step == 0 && item.sent > 0 {
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continue;
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}
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}
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let mut item_reader = item.data.read_exact_or_eos(MAX_CHUNK_LENGTH as usize);
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if let Poll::Ready(bytes_or_err) = Pin::new(&mut item_reader).poll(ctx) {
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let id = item.id;
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let eos = item.data.eos();
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let mut item_reader = item.data.read_exact_or_eos(MAX_CHUNK_LENGTH as usize);
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if let Poll::Ready(bytes_or_err) = Pin::new(&mut item_reader).poll(ctx) {
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let id = item.id;
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let eos = item.data.eos();
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let packet = bytes_or_err.map_err(|e| match e {
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ReadExactError::Stream(err) => err,
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_ => unreachable!(),
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});
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let packet = bytes_or_err.map_err(|e| match e {
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ReadExactError::Stream(err) => err,
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_ => unreachable!(),
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});
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let is_err = packet.is_err();
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let data_frame = DataFrame::from_packet(packet, !eos);
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item.sent += data_frame.data().len();
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let is_err = packet.is_err();
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let data_frame = DataFrame::from_packet(packet, !eos);
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item.sent += data_frame.data().len();
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if eos || is_err {
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// If item had an order tag, remove it from the corresponding ordering list
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if let Some(OrderTag(stream, order)) = item.order_tag {
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let order_stream = self.order.get_mut(&stream).unwrap();
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assert_eq!(order_stream.pop_front(), Some(order));
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if order_stream.is_empty() {
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self.order.remove(&stream);
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}
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}
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// Remove item from sending queue
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self.items.remove(j);
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} else {
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// Move item later in send queue to implement LAS scheduling
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// (LAS = Least Attained Service)
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for k in j..self.items.len() - 1 {
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if self.items[k].sent >= self.items[k + 1].sent {
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self.items.swap(k, k + 1);
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} else {
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break;
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if eos || is_err {
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// If item had an order tag, remove it from the corresponding ordering list
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if let Some(OrderTag(stream, order)) = item.order_tag {
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let order_stream = self.order.get_mut(&stream).unwrap();
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assert_eq!(order_stream.pop_front(), Some(order));
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if order_stream.is_empty() {
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self.order.remove(&stream);
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}
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}
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// Remove item from sending queue
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self.items.remove(j);
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} else if step == 0 {
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// Step 0 means that this stream had not sent any bytes yet.
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// Now that it has, and it was not an EOS, we know that it is bigger
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// than one chunk so move it at the end of the queue.
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let item = self.items.remove(j).unwrap();
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self.items.push_back(item);
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}
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return Poll::Ready((id, data_frame));
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}
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return Poll::Ready((id, data_frame));
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}
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}
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@ -190,7 +190,7 @@ impl RecvLoop for ServerConn {
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let (prio, resp_enc_result) = match ReqEnc::decode(stream).await {
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Ok(req_enc) => (req_enc.prio, self2.recv_handler_aux(req_enc).await),
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Err(e) => (PRIO_HIGH, Err(e)),
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Err(e) => (PRIO_NORMAL, Err(e)),
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};
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debug!("server: sending response to {}", id);
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