LCOV - code coverage report
Current view: top level - pageserver/src/tenant/storage_layer - batch_split_writer.rs (source / functions) Coverage Total Hit
Test: b9d67f908f91f00e353a27440ba89f642a869959.info Lines: 96.1 % 597 574
Test Date: 2024-11-19 21:44:13 Functions: 92.9 % 70 65

            Line data    Source code
       1              : use std::{future::Future, ops::Range, sync::Arc};
       2              : 
       3              : use bytes::Bytes;
       4              : use pageserver_api::key::{Key, KEY_SIZE};
       5              : use utils::{id::TimelineId, lsn::Lsn, shard::TenantShardId};
       6              : 
       7              : use crate::tenant::storage_layer::Layer;
       8              : use crate::{config::PageServerConf, context::RequestContext, tenant::Timeline};
       9              : use pageserver_api::value::Value;
      10              : 
      11              : use super::layer::S3_UPLOAD_LIMIT;
      12              : use super::{
      13              :     DeltaLayerWriter, ImageLayerWriter, PersistentLayerDesc, PersistentLayerKey, ResidentLayer,
      14              : };
      15              : 
      16              : pub(crate) enum BatchWriterResult {
      17              :     Produced(ResidentLayer),
      18              :     Discarded(PersistentLayerKey),
      19              : }
      20              : 
      21              : #[cfg(test)]
      22              : impl BatchWriterResult {
      23           24 :     fn into_resident_layer(self) -> ResidentLayer {
      24           24 :         match self {
      25           24 :             BatchWriterResult::Produced(layer) => layer,
      26            0 :             BatchWriterResult::Discarded(_) => panic!("unexpected discarded layer"),
      27              :         }
      28           24 :     }
      29              : 
      30           16 :     fn into_discarded_layer(self) -> PersistentLayerKey {
      31           16 :         match self {
      32            0 :             BatchWriterResult::Produced(_) => panic!("unexpected produced layer"),
      33           16 :             BatchWriterResult::Discarded(layer) => layer,
      34           16 :         }
      35           16 :     }
      36              : }
      37              : 
      38              : enum LayerWriterWrapper {
      39              :     Image(ImageLayerWriter),
      40              :     Delta(DeltaLayerWriter),
      41              : }
      42              : 
      43              : /// An layer writer that takes unfinished layers and finish them atomically.
      44              : #[must_use]
      45              : pub struct BatchLayerWriter {
      46              :     generated_layer_writers: Vec<(LayerWriterWrapper, PersistentLayerKey)>,
      47              :     conf: &'static PageServerConf,
      48              : }
      49              : 
      50              : impl BatchLayerWriter {
      51           96 :     pub async fn new(conf: &'static PageServerConf) -> anyhow::Result<Self> {
      52           96 :         Ok(Self {
      53           96 :             generated_layer_writers: Vec::new(),
      54           96 :             conf,
      55           96 :         })
      56           96 :     }
      57              : 
      58           56 :     pub fn add_unfinished_image_writer(
      59           56 :         &mut self,
      60           56 :         writer: ImageLayerWriter,
      61           56 :         key_range: Range<Key>,
      62           56 :         lsn: Lsn,
      63           56 :     ) {
      64           56 :         self.generated_layer_writers.push((
      65           56 :             LayerWriterWrapper::Image(writer),
      66           56 :             PersistentLayerKey {
      67           56 :                 key_range,
      68           56 :                 lsn_range: PersistentLayerDesc::image_layer_lsn_range(lsn),
      69           56 :                 is_delta: false,
      70           56 :             },
      71           56 :         ));
      72           56 :     }
      73              : 
      74           48 :     pub fn add_unfinished_delta_writer(
      75           48 :         &mut self,
      76           48 :         writer: DeltaLayerWriter,
      77           48 :         key_range: Range<Key>,
      78           48 :         lsn_range: Range<Lsn>,
      79           48 :     ) {
      80           48 :         self.generated_layer_writers.push((
      81           48 :             LayerWriterWrapper::Delta(writer),
      82           48 :             PersistentLayerKey {
      83           48 :                 key_range,
      84           48 :                 lsn_range,
      85           48 :                 is_delta: true,
      86           48 :             },
      87           48 :         ));
      88           48 :     }
      89              : 
      90           88 :     pub(crate) async fn finish_with_discard_fn<D, F>(
      91           88 :         self,
      92           88 :         tline: &Arc<Timeline>,
      93           88 :         ctx: &RequestContext,
      94           88 :         discard_fn: D,
      95           88 :     ) -> anyhow::Result<Vec<BatchWriterResult>>
      96           88 :     where
      97           88 :         D: Fn(&PersistentLayerKey) -> F,
      98           88 :         F: Future<Output = bool>,
      99           88 :     {
     100           88 :         let Self {
     101           88 :             generated_layer_writers,
     102           88 :             ..
     103           88 :         } = self;
     104           88 :         let clean_up_layers = |generated_layers: Vec<BatchWriterResult>| {
     105            0 :             for produced_layer in generated_layers {
     106            0 :                 if let BatchWriterResult::Produced(resident_layer) = produced_layer {
     107            0 :                     let layer: Layer = resident_layer.into();
     108            0 :                     layer.delete_on_drop();
     109            0 :                 }
     110              :             }
     111            0 :         };
     112              :         // BEGIN: catch every error and do the recovery in the below section
     113           88 :         let mut generated_layers: Vec<BatchWriterResult> = Vec::new();
     114          192 :         for (inner, layer_key) in generated_layer_writers {
     115          104 :             if discard_fn(&layer_key).await {
     116           36 :                 generated_layers.push(BatchWriterResult::Discarded(layer_key));
     117           36 :             } else {
     118           68 :                 let res = match inner {
     119           28 :                     LayerWriterWrapper::Delta(writer) => {
     120           73 :                         writer.finish(layer_key.key_range.end, ctx).await
     121              :                     }
     122           40 :                     LayerWriterWrapper::Image(writer) => {
     123           40 :                         writer
     124           40 :                             .finish_with_end_key(layer_key.key_range.end, ctx)
     125           80 :                             .await
     126              :                     }
     127              :                 };
     128           68 :                 let layer = match res {
     129           68 :                     Ok((desc, path)) => {
     130           68 :                         match Layer::finish_creating(self.conf, tline, desc, &path) {
     131           68 :                             Ok(layer) => layer,
     132            0 :                             Err(e) => {
     133            0 :                                 tokio::fs::remove_file(&path).await.ok();
     134            0 :                                 clean_up_layers(generated_layers);
     135            0 :                                 return Err(e);
     136              :                             }
     137              :                         }
     138              :                     }
     139            0 :                     Err(e) => {
     140            0 :                         // Image/DeltaLayerWriter::finish will clean up the temporary layer if anything goes wrong,
     141            0 :                         // so we don't need to remove the layer we just failed to create by ourselves.
     142            0 :                         clean_up_layers(generated_layers);
     143            0 :                         return Err(e);
     144              :                     }
     145              :                 };
     146           68 :                 generated_layers.push(BatchWriterResult::Produced(layer));
     147              :             }
     148              :         }
     149              :         // END: catch every error and do the recovery in the above section
     150           88 :         Ok(generated_layers)
     151           88 :     }
     152              : }
     153              : 
     154              : /// An image writer that takes images and produces multiple image layers.
     155              : #[must_use]
     156              : pub struct SplitImageLayerWriter {
     157              :     inner: ImageLayerWriter,
     158              :     target_layer_size: u64,
     159              :     lsn: Lsn,
     160              :     conf: &'static PageServerConf,
     161              :     timeline_id: TimelineId,
     162              :     tenant_shard_id: TenantShardId,
     163              :     batches: BatchLayerWriter,
     164              :     start_key: Key,
     165              : }
     166              : 
     167              : impl SplitImageLayerWriter {
     168           46 :     pub async fn new(
     169           46 :         conf: &'static PageServerConf,
     170           46 :         timeline_id: TimelineId,
     171           46 :         tenant_shard_id: TenantShardId,
     172           46 :         start_key: Key,
     173           46 :         lsn: Lsn,
     174           46 :         target_layer_size: u64,
     175           46 :         ctx: &RequestContext,
     176           46 :     ) -> anyhow::Result<Self> {
     177           46 :         Ok(Self {
     178           46 :             target_layer_size,
     179           46 :             inner: ImageLayerWriter::new(
     180           46 :                 conf,
     181           46 :                 timeline_id,
     182           46 :                 tenant_shard_id,
     183           46 :                 &(start_key..Key::MAX),
     184           46 :                 lsn,
     185           46 :                 ctx,
     186           46 :             )
     187           23 :             .await?,
     188           46 :             conf,
     189           46 :             timeline_id,
     190           46 :             tenant_shard_id,
     191           46 :             batches: BatchLayerWriter::new(conf).await?,
     192           46 :             lsn,
     193           46 :             start_key,
     194              :         })
     195           46 :     }
     196              : 
     197         8522 :     pub async fn put_image(
     198         8522 :         &mut self,
     199         8522 :         key: Key,
     200         8522 :         img: Bytes,
     201         8522 :         ctx: &RequestContext,
     202         8522 :     ) -> anyhow::Result<()> {
     203         8522 :         // The current estimation is an upper bound of the space that the key/image could take
     204         8522 :         // because we did not consider compression in this estimation. The resulting image layer
     205         8522 :         // could be smaller than the target size.
     206         8522 :         let addition_size_estimation = KEY_SIZE as u64 + img.len() as u64;
     207         8522 :         if self.inner.num_keys() >= 1
     208         8476 :             && self.inner.estimated_size() + addition_size_estimation >= self.target_layer_size
     209              :         {
     210           14 :             let next_image_writer = ImageLayerWriter::new(
     211           14 :                 self.conf,
     212           14 :                 self.timeline_id,
     213           14 :                 self.tenant_shard_id,
     214           14 :                 &(key..Key::MAX),
     215           14 :                 self.lsn,
     216           14 :                 ctx,
     217           14 :             )
     218            7 :             .await?;
     219           14 :             let prev_image_writer = std::mem::replace(&mut self.inner, next_image_writer);
     220           14 :             self.batches.add_unfinished_image_writer(
     221           14 :                 prev_image_writer,
     222           14 :                 self.start_key..key,
     223           14 :                 self.lsn,
     224           14 :             );
     225           14 :             self.start_key = key;
     226         8508 :         }
     227         8647 :         self.inner.put_image(key, img, ctx).await
     228         8522 :     }
     229              : 
     230           42 :     pub(crate) async fn finish_with_discard_fn<D, F>(
     231           42 :         self,
     232           42 :         tline: &Arc<Timeline>,
     233           42 :         ctx: &RequestContext,
     234           42 :         end_key: Key,
     235           42 :         discard_fn: D,
     236           42 :     ) -> anyhow::Result<Vec<BatchWriterResult>>
     237           42 :     where
     238           42 :         D: Fn(&PersistentLayerKey) -> F,
     239           42 :         F: Future<Output = bool>,
     240           42 :     {
     241           42 :         let Self {
     242           42 :             mut batches, inner, ..
     243           42 :         } = self;
     244           42 :         if inner.num_keys() != 0 {
     245           42 :             batches.add_unfinished_image_writer(inner, self.start_key..end_key, self.lsn);
     246           42 :         }
     247           80 :         batches.finish_with_discard_fn(tline, ctx, discard_fn).await
     248           42 :     }
     249              : 
     250              :     #[cfg(test)]
     251            4 :     pub(crate) async fn finish(
     252            4 :         self,
     253            4 :         tline: &Arc<Timeline>,
     254            4 :         ctx: &RequestContext,
     255            4 :         end_key: Key,
     256            4 :     ) -> anyhow::Result<Vec<BatchWriterResult>> {
     257            6 :         self.finish_with_discard_fn(tline, ctx, end_key, |_| async { false })
     258           12 :             .await
     259            4 :     }
     260              : }
     261              : 
     262              : /// A delta writer that takes key-lsn-values and produces multiple delta layers.
     263              : ///
     264              : /// Note that if updates of a single key exceed the target size limit, all of the updates will be batched
     265              : /// into a single file. This behavior might change in the future. For reference, the legacy compaction algorithm
     266              : /// will split them into multiple files based on size.
     267              : #[must_use]
     268              : pub struct SplitDeltaLayerWriter {
     269              :     inner: Option<(Key, DeltaLayerWriter)>,
     270              :     target_layer_size: u64,
     271              :     conf: &'static PageServerConf,
     272              :     timeline_id: TimelineId,
     273              :     tenant_shard_id: TenantShardId,
     274              :     lsn_range: Range<Lsn>,
     275              :     last_key_written: Key,
     276              :     batches: BatchLayerWriter,
     277              : }
     278              : 
     279              : impl SplitDeltaLayerWriter {
     280           50 :     pub async fn new(
     281           50 :         conf: &'static PageServerConf,
     282           50 :         timeline_id: TimelineId,
     283           50 :         tenant_shard_id: TenantShardId,
     284           50 :         lsn_range: Range<Lsn>,
     285           50 :         target_layer_size: u64,
     286           50 :     ) -> anyhow::Result<Self> {
     287           50 :         Ok(Self {
     288           50 :             target_layer_size,
     289           50 :             inner: None,
     290           50 :             conf,
     291           50 :             timeline_id,
     292           50 :             tenant_shard_id,
     293           50 :             lsn_range,
     294           50 :             last_key_written: Key::MIN,
     295           50 :             batches: BatchLayerWriter::new(conf).await?,
     296              :         })
     297           50 :     }
     298              : 
     299        12144 :     pub async fn put_value(
     300        12144 :         &mut self,
     301        12144 :         key: Key,
     302        12144 :         lsn: Lsn,
     303        12144 :         val: Value,
     304        12144 :         ctx: &RequestContext,
     305        12144 :     ) -> anyhow::Result<()> {
     306        12144 :         // The current estimation is key size plus LSN size plus value size estimation. This is not an accurate
     307        12144 :         // number, and therefore the final layer size could be a little bit larger or smaller than the target.
     308        12144 :         //
     309        12144 :         // Also, keep all updates of a single key in a single file. TODO: split them using the legacy compaction
     310        12144 :         // strategy. https://github.com/neondatabase/neon/issues/8837
     311        12144 : 
     312        12144 :         if self.inner.is_none() {
     313           38 :             self.inner = Some((
     314           38 :                 key,
     315           38 :                 DeltaLayerWriter::new(
     316           38 :                     self.conf,
     317           38 :                     self.timeline_id,
     318           38 :                     self.tenant_shard_id,
     319           38 :                     key,
     320           38 :                     self.lsn_range.clone(),
     321           38 :                     ctx,
     322           38 :                 )
     323           19 :                 .await?,
     324              :             ));
     325        12106 :         }
     326        12144 :         let (_, inner) = self.inner.as_mut().unwrap();
     327        12144 : 
     328        12144 :         let addition_size_estimation = KEY_SIZE as u64 + 8 /* LSN u64 size */ + 80 /* value size estimation */;
     329        12144 :         if inner.num_keys() >= 1
     330        12106 :             && inner.estimated_size() + addition_size_estimation >= self.target_layer_size
     331              :         {
     332         2996 :             if key != self.last_key_written {
     333           14 :                 let next_delta_writer = DeltaLayerWriter::new(
     334           14 :                     self.conf,
     335           14 :                     self.timeline_id,
     336           14 :                     self.tenant_shard_id,
     337           14 :                     key,
     338           14 :                     self.lsn_range.clone(),
     339           14 :                     ctx,
     340           14 :                 )
     341            7 :                 .await?;
     342           14 :                 let (start_key, prev_delta_writer) =
     343           14 :                     std::mem::replace(&mut self.inner, Some((key, next_delta_writer))).unwrap();
     344           14 :                 self.batches.add_unfinished_delta_writer(
     345           14 :                     prev_delta_writer,
     346           14 :                     start_key..key,
     347           14 :                     self.lsn_range.clone(),
     348           14 :                 );
     349         2982 :             } else if inner.estimated_size() >= S3_UPLOAD_LIMIT {
     350              :                 // We have to produce a very large file b/c a key is updated too often.
     351            0 :                 anyhow::bail!(
     352            0 :                     "a single key is updated too often: key={}, estimated_size={}, and the layer file cannot be produced",
     353            0 :                     key,
     354            0 :                     inner.estimated_size()
     355            0 :                 );
     356         2982 :             }
     357         9148 :         }
     358        12144 :         self.last_key_written = key;
     359        12144 :         let (_, inner) = self.inner.as_mut().unwrap();
     360        12144 :         inner.put_value(key, lsn, val, ctx).await
     361        12144 :     }
     362              : 
     363           46 :     pub(crate) async fn finish_with_discard_fn<D, F>(
     364           46 :         self,
     365           46 :         tline: &Arc<Timeline>,
     366           46 :         ctx: &RequestContext,
     367           46 :         discard_fn: D,
     368           46 :     ) -> anyhow::Result<Vec<BatchWriterResult>>
     369           46 :     where
     370           46 :         D: Fn(&PersistentLayerKey) -> F,
     371           46 :         F: Future<Output = bool>,
     372           46 :     {
     373           46 :         let Self {
     374           46 :             mut batches, inner, ..
     375           46 :         } = self;
     376           46 :         if let Some((start_key, writer)) = inner {
     377           34 :             if writer.num_keys() != 0 {
     378           34 :                 let end_key = self.last_key_written.next();
     379           34 :                 batches.add_unfinished_delta_writer(
     380           34 :                     writer,
     381           34 :                     start_key..end_key,
     382           34 :                     self.lsn_range.clone(),
     383           34 :                 );
     384           34 :             }
     385           12 :         }
     386           73 :         batches.finish_with_discard_fn(tline, ctx, discard_fn).await
     387           46 :     }
     388              : 
     389              :     #[cfg(test)]
     390            6 :     pub(crate) async fn finish(
     391            6 :         self,
     392            6 :         tline: &Arc<Timeline>,
     393            6 :         ctx: &RequestContext,
     394            6 :     ) -> anyhow::Result<Vec<BatchWriterResult>> {
     395            8 :         self.finish_with_discard_fn(tline, ctx, |_| async { false })
     396           23 :             .await
     397            6 :     }
     398              : }
     399              : 
     400              : #[cfg(test)]
     401              : mod tests {
     402              :     use itertools::Itertools;
     403              :     use rand::{RngCore, SeedableRng};
     404              : 
     405              :     use crate::{
     406              :         tenant::{
     407              :             harness::{TenantHarness, TIMELINE_ID},
     408              :             storage_layer::AsLayerDesc,
     409              :         },
     410              :         DEFAULT_PG_VERSION,
     411              :     };
     412              : 
     413              :     use super::*;
     414              : 
     415        20052 :     fn get_key(id: u32) -> Key {
     416        20052 :         let mut key = Key::from_hex("000000000033333333444444445500000000").unwrap();
     417        20052 :         key.field6 = id;
     418        20052 :         key
     419        20052 :     }
     420              : 
     421            8 :     fn get_img(id: u32) -> Bytes {
     422            8 :         format!("{id:064}").into()
     423            8 :     }
     424              : 
     425        20004 :     fn get_large_img() -> Bytes {
     426        20004 :         let mut rng = rand::rngs::SmallRng::seed_from_u64(42);
     427        20004 :         let mut data = vec![0; 8192];
     428        20004 :         rng.fill_bytes(&mut data);
     429        20004 :         data.into()
     430        20004 :     }
     431              : 
     432              :     #[tokio::test]
     433            2 :     async fn write_one_image() {
     434            2 :         let harness = TenantHarness::create("split_writer_write_one_image")
     435            2 :             .await
     436            2 :             .unwrap();
     437           20 :         let (tenant, ctx) = harness.load().await;
     438            2 : 
     439            2 :         let tline = tenant
     440            2 :             .create_test_timeline(TIMELINE_ID, Lsn(0x10), DEFAULT_PG_VERSION, &ctx)
     441            6 :             .await
     442            2 :             .unwrap();
     443            2 : 
     444            2 :         let mut image_writer = SplitImageLayerWriter::new(
     445            2 :             tenant.conf,
     446            2 :             tline.timeline_id,
     447            2 :             tenant.tenant_shard_id,
     448            2 :             get_key(0),
     449            2 :             Lsn(0x18),
     450            2 :             4 * 1024 * 1024,
     451            2 :             &ctx,
     452            2 :         )
     453            2 :         .await
     454            2 :         .unwrap();
     455            2 : 
     456            2 :         let mut delta_writer = SplitDeltaLayerWriter::new(
     457            2 :             tenant.conf,
     458            2 :             tline.timeline_id,
     459            2 :             tenant.tenant_shard_id,
     460            2 :             Lsn(0x18)..Lsn(0x20),
     461            2 :             4 * 1024 * 1024,
     462            2 :         )
     463            2 :         .await
     464            2 :         .unwrap();
     465            2 : 
     466            2 :         image_writer
     467            2 :             .put_image(get_key(0), get_img(0), &ctx)
     468            2 :             .await
     469            2 :             .unwrap();
     470            2 :         let layers = image_writer
     471            2 :             .finish(&tline, &ctx, get_key(10))
     472            4 :             .await
     473            2 :             .unwrap();
     474            2 :         assert_eq!(layers.len(), 1);
     475            2 : 
     476            2 :         delta_writer
     477            2 :             .put_value(get_key(0), Lsn(0x18), Value::Image(get_img(0)), &ctx)
     478            2 :             .await
     479            2 :             .unwrap();
     480            5 :         let layers = delta_writer.finish(&tline, &ctx).await.unwrap();
     481            2 :         assert_eq!(layers.len(), 1);
     482            2 :         assert_eq!(
     483            2 :             layers
     484            2 :                 .into_iter()
     485            2 :                 .next()
     486            2 :                 .unwrap()
     487            2 :                 .into_resident_layer()
     488            2 :                 .layer_desc()
     489            2 :                 .key(),
     490            2 :             PersistentLayerKey {
     491            2 :                 key_range: get_key(0)..get_key(1),
     492            2 :                 lsn_range: Lsn(0x18)..Lsn(0x20),
     493            2 :                 is_delta: true
     494            2 :             }
     495            2 :         );
     496            2 :     }
     497              : 
     498              :     #[tokio::test]
     499            2 :     async fn write_split() {
     500            2 :         // Test the split writer with retaining all the layers we have produced (discard=false)
     501         4384 :         write_split_helper("split_writer_write_split", false).await;
     502            2 :     }
     503              : 
     504              :     #[tokio::test]
     505            2 :     async fn write_split_discard() {
     506            2 :         // Test the split writer with discarding all the layers we have produced (discard=true)
     507         4348 :         write_split_helper("split_writer_write_split_discard", true).await;
     508            2 :     }
     509              : 
     510              :     /// Test the image+delta writer by writing a large number of images and deltas. If discard is
     511              :     /// set to true, all layers will be discarded.
     512            4 :     async fn write_split_helper(harness_name: &'static str, discard: bool) {
     513            4 :         let harness = TenantHarness::create(harness_name).await.unwrap();
     514           40 :         let (tenant, ctx) = harness.load().await;
     515              : 
     516            4 :         let tline = tenant
     517            4 :             .create_test_timeline(TIMELINE_ID, Lsn(0x10), DEFAULT_PG_VERSION, &ctx)
     518           12 :             .await
     519            4 :             .unwrap();
     520              : 
     521            4 :         let mut image_writer = SplitImageLayerWriter::new(
     522            4 :             tenant.conf,
     523            4 :             tline.timeline_id,
     524            4 :             tenant.tenant_shard_id,
     525            4 :             get_key(0),
     526            4 :             Lsn(0x18),
     527            4 :             4 * 1024 * 1024,
     528            4 :             &ctx,
     529            4 :         )
     530            2 :         .await
     531            4 :         .unwrap();
     532            4 :         let mut delta_writer = SplitDeltaLayerWriter::new(
     533            4 :             tenant.conf,
     534            4 :             tline.timeline_id,
     535            4 :             tenant.tenant_shard_id,
     536            4 :             Lsn(0x18)..Lsn(0x20),
     537            4 :             4 * 1024 * 1024,
     538            4 :         )
     539            0 :         .await
     540            4 :         .unwrap();
     541              :         const N: usize = 2000;
     542         8004 :         for i in 0..N {
     543         8000 :             let i = i as u32;
     544         8000 :             image_writer
     545         8000 :                 .put_image(get_key(i), get_large_img(), &ctx)
     546         8130 :                 .await
     547         8000 :                 .unwrap();
     548         8000 :             delta_writer
     549         8000 :                 .put_value(get_key(i), Lsn(0x20), Value::Image(get_large_img()), &ctx)
     550          512 :                 .await
     551         8000 :                 .unwrap();
     552              :         }
     553            4 :         let image_layers = image_writer
     554           16 :             .finish_with_discard_fn(&tline, &ctx, get_key(N as u32), |_| async { discard })
     555           16 :             .await
     556            4 :             .unwrap();
     557            4 :         let delta_layers = delta_writer
     558           16 :             .finish_with_discard_fn(&tline, &ctx, |_| async { discard })
     559           20 :             .await
     560            4 :             .unwrap();
     561            4 :         let image_layers = image_layers
     562            4 :             .into_iter()
     563           16 :             .map(|x| {
     564           16 :                 if discard {
     565            8 :                     x.into_discarded_layer()
     566              :                 } else {
     567            8 :                     x.into_resident_layer().layer_desc().key()
     568              :                 }
     569           16 :             })
     570            4 :             .collect_vec();
     571            4 :         let delta_layers = delta_layers
     572            4 :             .into_iter()
     573           16 :             .map(|x| {
     574           16 :                 if discard {
     575            8 :                     x.into_discarded_layer()
     576              :                 } else {
     577            8 :                     x.into_resident_layer().layer_desc().key()
     578              :                 }
     579           16 :             })
     580            4 :             .collect_vec();
     581            4 :         assert_eq!(image_layers.len(), N / 512 + 1);
     582            4 :         assert_eq!(delta_layers.len(), N / 512 + 1);
     583            4 :         assert_eq!(delta_layers.first().unwrap().key_range.start, get_key(0));
     584            4 :         assert_eq!(
     585            4 :             delta_layers.last().unwrap().key_range.end,
     586            4 :             get_key(N as u32)
     587            4 :         );
     588           16 :         for idx in 0..image_layers.len() {
     589           16 :             assert_ne!(image_layers[idx].key_range.start, Key::MIN);
     590           16 :             assert_ne!(image_layers[idx].key_range.end, Key::MAX);
     591           16 :             assert_ne!(delta_layers[idx].key_range.start, Key::MIN);
     592           16 :             assert_ne!(delta_layers[idx].key_range.end, Key::MAX);
     593           16 :             if idx > 0 {
     594           12 :                 assert_eq!(
     595           12 :                     image_layers[idx - 1].key_range.end,
     596           12 :                     image_layers[idx].key_range.start
     597           12 :                 );
     598           12 :                 assert_eq!(
     599           12 :                     delta_layers[idx - 1].key_range.end,
     600           12 :                     delta_layers[idx].key_range.start
     601           12 :                 );
     602            4 :             }
     603              :         }
     604            4 :     }
     605              : 
     606              :     #[tokio::test]
     607            2 :     async fn write_large_img() {
     608            2 :         let harness = TenantHarness::create("split_writer_write_large_img")
     609            2 :             .await
     610            2 :             .unwrap();
     611           20 :         let (tenant, ctx) = harness.load().await;
     612            2 : 
     613            2 :         let tline = tenant
     614            2 :             .create_test_timeline(TIMELINE_ID, Lsn(0x10), DEFAULT_PG_VERSION, &ctx)
     615            6 :             .await
     616            2 :             .unwrap();
     617            2 : 
     618            2 :         let mut image_writer = SplitImageLayerWriter::new(
     619            2 :             tenant.conf,
     620            2 :             tline.timeline_id,
     621            2 :             tenant.tenant_shard_id,
     622            2 :             get_key(0),
     623            2 :             Lsn(0x18),
     624            2 :             4 * 1024,
     625            2 :             &ctx,
     626            2 :         )
     627            2 :         .await
     628            2 :         .unwrap();
     629            2 : 
     630            2 :         let mut delta_writer = SplitDeltaLayerWriter::new(
     631            2 :             tenant.conf,
     632            2 :             tline.timeline_id,
     633            2 :             tenant.tenant_shard_id,
     634            2 :             Lsn(0x18)..Lsn(0x20),
     635            2 :             4 * 1024,
     636            2 :         )
     637            2 :         .await
     638            2 :         .unwrap();
     639            2 : 
     640            2 :         image_writer
     641            2 :             .put_image(get_key(0), get_img(0), &ctx)
     642            2 :             .await
     643            2 :             .unwrap();
     644            2 :         image_writer
     645            2 :             .put_image(get_key(1), get_large_img(), &ctx)
     646            3 :             .await
     647            2 :             .unwrap();
     648            2 :         let layers = image_writer
     649            2 :             .finish(&tline, &ctx, get_key(10))
     650            8 :             .await
     651            2 :             .unwrap();
     652            2 :         assert_eq!(layers.len(), 2);
     653            2 : 
     654            2 :         delta_writer
     655            2 :             .put_value(get_key(0), Lsn(0x18), Value::Image(get_img(0)), &ctx)
     656            2 :             .await
     657            2 :             .unwrap();
     658            2 :         delta_writer
     659            2 :             .put_value(get_key(1), Lsn(0x1A), Value::Image(get_large_img()), &ctx)
     660            2 :             .await
     661            2 :             .unwrap();
     662           10 :         let layers = delta_writer.finish(&tline, &ctx).await.unwrap();
     663            2 :         assert_eq!(layers.len(), 2);
     664            2 :         let mut layers_iter = layers.into_iter();
     665            2 :         assert_eq!(
     666            2 :             layers_iter
     667            2 :                 .next()
     668            2 :                 .unwrap()
     669            2 :                 .into_resident_layer()
     670            2 :                 .layer_desc()
     671            2 :                 .key(),
     672            2 :             PersistentLayerKey {
     673            2 :                 key_range: get_key(0)..get_key(1),
     674            2 :                 lsn_range: Lsn(0x18)..Lsn(0x20),
     675            2 :                 is_delta: true
     676            2 :             }
     677            2 :         );
     678            2 :         assert_eq!(
     679            2 :             layers_iter
     680            2 :                 .next()
     681            2 :                 .unwrap()
     682            2 :                 .into_resident_layer()
     683            2 :                 .layer_desc()
     684            2 :                 .key(),
     685            2 :             PersistentLayerKey {
     686            2 :                 key_range: get_key(1)..get_key(2),
     687            2 :                 lsn_range: Lsn(0x18)..Lsn(0x20),
     688            2 :                 is_delta: true
     689            2 :             }
     690            2 :         );
     691            2 :     }
     692              : 
     693              :     #[tokio::test]
     694            2 :     async fn write_split_single_key() {
     695            2 :         let harness = TenantHarness::create("split_writer_write_split_single_key")
     696            2 :             .await
     697            2 :             .unwrap();
     698           20 :         let (tenant, ctx) = harness.load().await;
     699            2 : 
     700            2 :         let tline = tenant
     701            2 :             .create_test_timeline(TIMELINE_ID, Lsn(0x10), DEFAULT_PG_VERSION, &ctx)
     702            6 :             .await
     703            2 :             .unwrap();
     704            2 : 
     705            2 :         const N: usize = 2000;
     706            2 :         let mut delta_writer = SplitDeltaLayerWriter::new(
     707            2 :             tenant.conf,
     708            2 :             tline.timeline_id,
     709            2 :             tenant.tenant_shard_id,
     710            2 :             Lsn(0x10)..Lsn(N as u64 * 16 + 0x10),
     711            2 :             4 * 1024 * 1024,
     712            2 :         )
     713            2 :         .await
     714            2 :         .unwrap();
     715            2 : 
     716         4002 :         for i in 0..N {
     717         4000 :             let i = i as u32;
     718         4000 :             delta_writer
     719         4000 :                 .put_value(
     720         4000 :                     get_key(0),
     721         4000 :                     Lsn(i as u64 * 16 + 0x10),
     722         4000 :                     Value::Image(get_large_img()),
     723         4000 :                     &ctx,
     724         4000 :                 )
     725          254 :                 .await
     726         4000 :                 .unwrap();
     727            2 :         }
     728            8 :         let delta_layers = delta_writer.finish(&tline, &ctx).await.unwrap();
     729            2 :         assert_eq!(delta_layers.len(), 1);
     730            2 :         let delta_layer = delta_layers
     731            2 :             .into_iter()
     732            2 :             .next()
     733            2 :             .unwrap()
     734            2 :             .into_resident_layer();
     735            2 :         assert_eq!(
     736            2 :             delta_layer.layer_desc().key(),
     737            2 :             PersistentLayerKey {
     738            2 :                 key_range: get_key(0)..get_key(1),
     739            2 :                 lsn_range: Lsn(0x10)..Lsn(N as u64 * 16 + 0x10),
     740            2 :                 is_delta: true
     741            2 :             }
     742            2 :         );
     743            2 :     }
     744              : }
        

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