store split_fields in split

quickwit/Cargo.toml

@@ -223,6 +223,7 @@ vrl = { version = "0.8.1", default-features = false, features = [
 warp = "0.3"
 whichlang = { git = "https://github.com/quickwit-oss/whichlang", rev = "fe406416" }
 wiremock = "0.5"
+zstd = "0.13.0"
 
 aws-config = "0.55.0"
 aws-credential-types = { version = "0.55.0", features = [

quickwit/quickwit-common/src/shared_consts.rs

@@ -38,3 +38,6 @@ pub const SCROLL_BATCH_LEN: usize = 1_000;
 
 /// Prefix used in chitchat to broadcast the list of primary shards hosted by a leader.
 pub const INGESTER_PRIMARY_SHARDS_PREFIX: &str = "ingester.primary_shards:";
+
+/// File name for the encoded list of fields in the split
+pub const SPLIT_FIELDS_FILE_NAME: &str = "split_fields";

quickwit/quickwit-directories/src/bundle_directory.rs

@@ -164,6 +164,7 @@ mod tests {
     use std::fs::File;
     use std::io::Write;
 
+    use quickwit_common::shared_consts::SPLIT_FIELDS_FILE_NAME;
     use quickwit_storage::{PutPayload, SplitPayloadBuilder};
 
     use super::*;
@@ -182,6 +183,7 @@ mod tests {
 
         let split_streamer = SplitPayloadBuilder::get_split_payload(
             &[test_filepath1.clone(), test_filepath2.clone()],
+            &[],
             &[
                 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
             ],
@@ -213,6 +215,7 @@ mod tests {
 
         let split_streamer = SplitPayloadBuilder::get_split_payload(
             &[test_filepath1.clone(), test_filepath2.clone()],
+            &[],
             &[
                 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
             ],
@@ -251,13 +254,17 @@ mod tests {
 
         let split_streamer = SplitPayloadBuilder::get_split_payload(
             &[test_filepath1.clone(), test_filepath2.clone()],
+            &[5, 5, 5],
             &[1, 2, 3],
         )?;
 
         let data = split_streamer.read_all().await?;
 
         let bundle_dir = BundleDirectory::open_split(FileSlice::from(data.to_vec()))?;
 
+        let field_data = bundle_dir.atomic_read(Path::new(SPLIT_FIELDS_FILE_NAME))?;
+        assert_eq!(&*field_data, &[5, 5, 5]);
+
         let f1_data = bundle_dir.atomic_read(Path::new("f1"))?;
         assert_eq!(&*f1_data, &[123u8, 76u8]);
 

quickwit/quickwit-indexing/Cargo.toml

@@ -50,6 +50,7 @@ tracing = { workspace = true }
 ulid = { workspace = true }
 utoipa = { workspace = true }
 vrl = { workspace = true, optional = true }
+zstd = { workspace = true }
 
 quickwit-actors = { workspace = true }
 quickwit-aws = { workspace = true }

quickwit/quickwit-indexing/src/actors/merge_split_downloader.rs

@@ -160,7 +160,7 @@ mod tests {
         let split_store = {
             let mut storage_builder = RamStorageBuilder::default();
             for split in &splits_to_merge {
-                let buffer = SplitPayloadBuilder::get_split_payload(&[], &[1, 2, 3])?
+                let buffer = SplitPayloadBuilder::get_split_payload(&[], &[], &[1, 2, 3])?
                     .read_all()
                     .await?;
                 storage_builder = storage_builder.put(&split_file(split.split_id()), &buffer);

quickwit/quickwit-indexing/src/actors/packager.rs

@@ -46,7 +46,8 @@ const MAX_VALUES_PER_TAG_FIELD: usize = if cfg!(any(test, feature = "testsuite")
 
 use crate::actors::Uploader;
 use crate::models::{
-    EmptySplit, IndexedSplit, IndexedSplitBatch, PackagedSplit, PackagedSplitBatch,
+    serialize_split_fields, EmptySplit, IndexedSplit, IndexedSplitBatch, PackagedSplit,
+    PackagedSplitBatch,
 };
 
 /// The role of the packager is to get an index writer and
@@ -186,7 +187,6 @@ impl Handler<EmptySplit> for Packager {
     }
 }
 
-/// returns true iff merge is required to reach a state where
 fn list_split_files(
     segment_metas: &[SegmentMeta],
     scratch_directory: &TempDirectory,
@@ -287,6 +287,9 @@ fn create_packaged_split(
         .reader_builder()
         .reload_policy(ReloadPolicy::Manual)
         .try_into()?;
+
+    let fields_metadata = split.index.fields_metadata()?;
+
     let mut tags = BTreeSet::default();
     for named_field in tag_fields {
         let inverted_indexes = index_reader
@@ -312,8 +315,10 @@ fn create_packaged_split(
     let mut hotcache_bytes = Vec::new();
     build_hotcache(split.split_scratch_directory.path(), &mut hotcache_bytes)?;
     ctx.record_progress();
+    let serialized_split_fields = serialize_split_fields(&fields_metadata);
 
     let packaged_split = PackagedSplit {
+        serialized_split_fields,
         split_attrs: split.split_attrs,
         split_scratch_directory: split.split_scratch_directory,
         tags,

quickwit/quickwit-indexing/src/actors/uploader.rs

@@ -318,6 +318,7 @@ impl Handler<PackagedSplitBatch> for Uploader {
 
                     let split_streamer = SplitPayloadBuilder::get_split_payload(
                         &packaged_split.split_files,
+                        &packaged_split.serialized_split_fields,
                         &packaged_split.hotcache_bytes,
                     )?;
                     let split_metadata = create_split_metadata(
@@ -465,6 +466,7 @@ async fn upload_split(
 ) -> anyhow::Result<()> {
     let split_streamer = SplitPayloadBuilder::get_split_payload(
         &packaged_split.split_files,
+        &packaged_split.serialized_split_fields,
         &packaged_split.hotcache_bytes,
     )?;
 
@@ -561,6 +563,7 @@ mod tests {
                         delete_opstamp: 10,
                         num_merge_ops: 0,
                     },
+                    serialized_split_fields: Vec::new(),
                     split_scratch_directory,
                     tags: Default::default(),
                     hotcache_bytes: Vec::new(),
@@ -672,6 +675,7 @@ mod tests {
                 delete_opstamp: 0,
                 num_merge_ops: 0,
             },
+            serialized_split_fields: Vec::new(),
             split_scratch_directory: split_scratch_directory_1,
             tags: Default::default(),
             split_files: Vec::new(),
@@ -695,6 +699,7 @@ mod tests {
                 delete_opstamp: 0,
                 num_merge_ops: 0,
             },
+            serialized_split_fields: Vec::new(),
             split_scratch_directory: split_scratch_directory_2,
             tags: Default::default(),
             split_files: Vec::new(),
@@ -812,6 +817,7 @@ mod tests {
                         delete_opstamp: 10,
                         num_merge_ops: 0,
                     },
+                    serialized_split_fields: Vec::new(),
                     split_scratch_directory,
                     tags: Default::default(),
                     hotcache_bytes: Vec::new(),
@@ -990,6 +996,7 @@ mod tests {
                         delete_opstamp: 10,
                         num_merge_ops: 0,
                     },
+                    serialized_split_fields: Vec::new(),
                     split_scratch_directory,
                     tags: Default::default(),
                     hotcache_bytes: Vec::new(),

quickwit/quickwit-indexing/src/models/mod.rs

@@ -32,6 +32,7 @@ mod publisher_message;
 mod raw_doc_batch;
 mod shard_positions;
 mod split_attrs;
+mod split_fields;
 
 pub use indexed_split::{
     CommitTrigger, EmptySplit, IndexedSplit, IndexedSplitBatch, IndexedSplitBatchBuilder,
@@ -53,6 +54,7 @@ pub use raw_doc_batch::RawDocBatch;
 pub(crate) use shard_positions::LocalShardPositionsUpdate;
 pub use shard_positions::ShardPositionsService;
 pub use split_attrs::{create_split_metadata, SplitAttrs};
+pub use split_fields::{read_split_fields, serialize_split_fields, FieldConfig};
 
 #[derive(Debug)]
 pub struct NewPublishToken(pub PublishToken);

quickwit/quickwit-indexing/src/models/packaged_split.rs

@@ -31,6 +31,7 @@ use crate::merge_policy::MergeOperation;
 use crate::models::{PublishLock, SplitAttrs};
 
 pub struct PackagedSplit {
+    pub serialized_split_fields: Vec<u8>,
     pub split_attrs: SplitAttrs,
     pub split_scratch_directory: TempDirectory,
     pub tags: BTreeSet<String>,