From 895ca932caee427a731ee02e898daf9f2a89d348 Mon Sep 17 00:00:00 2001
From: lucasliang <nkcs_lykx@hotmail.com>
Date: Thu, 11 Jan 2024 16:34:46 +0800
Subject: [PATCH] rewrite: optimize the interval of `sync` when rewriting
 memtables. (#347)) (#349)

* [cherry-pick] rewrite: optimize the interval of `sync` when rewriting memtables. (#347)

In a cloud environment, refraining from unscheduling sync operations
when rewriting memtables might result in an accumulation of unsynced bytes
in the buffer. This accumulation has the potential to impede the foreground
write progress during sync.

This pull request introduces periodic sync operations when the amount of
stashed unsynced bytes exceeds a predefined threshold. This optimization
aims to address the issue and enhance performance.

Signed-off-by: lucasliang <nkcs_lykx@hotmail.com>
---
 .github/workflows/rust.yml |    8 +-
 .gitignore                 |    2 +-
 Cargo.lock                 | 2292 ++++++++++++++++++++++++++++++++++++
 Cargo.toml                 |   72 +-
 Makefile                   |    4 +-
 ctl/Cargo.toml             |    6 +-
 src/purge.rs               |   16 +-
 stress/Cargo.toml          |   10 +-
 8 files changed, 2359 insertions(+), 51 deletions(-)
 create mode 100644 Cargo.lock

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index ea8a33e1..6f770471 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -27,13 +27,15 @@ jobs:
           sharedKey: ${{ matrix.os }}
       - name: Cache dependencies
         if: ${{ matrix.os == 'ubuntu-latest' }}
-        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
+        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install --locked grcov --version 0.8.9; fi
       - name: Format
         run: |
           make format
           git diff --exit-code
       - name: Clippy
         run: make clippy
+        env:
+          EXTRA_CARGO_ARGS: '--fix'
       - name: Run tests
         run: make test
         env:
@@ -60,7 +62,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.61.0
+          toolchain: 1.63.0
           override: true
           components: rustfmt, clippy, rust-src
       - uses: Swatinem/rust-cache@v1
@@ -94,7 +96,7 @@ jobs:
         with:
           sharedKey: ubuntu-latest
       - name: Install grcov
-        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install --locked grcov; fi
+        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install --locked grcov --version 0.8.9; fi
       - name: Run tests
         run: |
           make test
diff --git a/.gitignore b/.gitignore
index 6ff1c833..3c10b711 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 ## File system
 .DS_Store
-Cargo.lock
+##Cargo.lock
 
 ## Build
 /target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 00000000..b727d237
--- /dev/null
+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
index c496617c..b5a08773 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,59 +33,57 @@ required-features = ["failpoints"]
 
 [dependencies]
 byteorder = "1.2"
-crc32fast = "1.2"
-crossbeam = "0.8"
+crc32fast = "1.2.0"
+crossbeam = "0.8.1"
 fail = "0.5"
 fs2 = "0.4"
-hashbrown = "0.13"
-hex = "0.4"
+hashbrown = "0.12.3"
+hex = "0.4.2"
 if_chain = "1.0"
 lazy_static = "1.3"
-libc = "0.2"
-log = { version = "0.4", features = ["max_level_trace", "release_max_level_debug"] }
+libc = "0.2.139"
+log = { version = "0.4.14", features = [
+  "max_level_trace",
+  "release_max_level_debug",
+] }
 lz4-sys = "1.9"
-memmap2 = { version = "0.5", optional = true }
-nix = "0.26"
-num-derive = "0.3"
-num-traits = "0.2"
-parking_lot = "0.12"
-prometheus = { version = "0.13" }
-prometheus-static-metric = "0.5"
+memmap2 = { version = "0.5.3", optional = true }
+nix = "0.26.2"
+num-derive = "0.3.0"
+num-traits = "0.2.14"
+parking_lot = "0.12.0"
+prometheus = { version = "0.13.0" }
+prometheus-static-metric = "0.5.1"
 protobuf = "2"
-rayon = "1.5"
-rhai = { version = "1.7", features = ["sync"], optional = true }
+rayon = "1.5.0"
+rhai = { version = "1.7.0", features = ["sync"], optional = true }
 scopeguard = "1.1"
-serde = { version = "1.0", features = ["derive"] }
-serde_repr = "0.1"
+serde = { version = "1.0.106", features = ["derive"] }
+serde_repr = "0.1.9"
 strum = { version = "0.24.0", features = ["derive"] }
-thiserror = "1.0"
+thiserror = "1.0.30"
 
 [dev-dependencies]
-criterion = "0.4"
+criterion = "0.3.5"
 ctor = "0.1"
-env_logger = "0.10"
-kvproto = { git = "https://github.com/pingcap/kvproto.git", default-features = false, features = ["protobuf-codec"] }
-raft = { git = "https://github.com/tikv/raft-rs", branch = "master", default-features = false, features = ["protobuf-codec"] }
+env_logger = "0.10.0"
+kvproto = { git = "https://github.com/pingcap/kvproto.git", branch = "release-6.5", default-features = false, features = [
+  "protobuf-codec",
+] }
+raft = { git = "https://github.com/tikv/raft-rs", rev = "f60fb9e143e5b93f7db8917ea376cda04effcbb4", default-features = false, features = [
+  "protobuf-codec",
+] }
 rand = "0.8"
 rand_distr = "0.4"
 tempfile = "3.1"
-toml = "0.7"
+toml = "0.5"
 
 [features]
 internals = []
-nightly = [
-  "prometheus/nightly",
-]
-failpoints = [
-  "fail/failpoints",
-]
-scripting = [
-  "rhai",
-]
-swap = [
-  "nightly",
-  "memmap2",
-]
+nightly = ["prometheus/nightly"]
+failpoints = ["fail/failpoints"]
+scripting = ["rhai"]
+swap = ["nightly", "memmap2"]
 
 # Shortcuts
 all_except_failpoints = ["internals", "scripting", "nightly", "swap"]
@@ -93,7 +91,7 @@ all_stable = ["internals", "scripting", "failpoints"]
 all_stable_except_failpoints = ["internals", "scripting"]
 
 [patch.crates-io]
-raft-proto = { git = "https://github.com/tikv/raft-rs", branch = "master" }
+raft-proto = { git = "https://github.com/tikv/raft-rs", rev = "f60fb9e143e5b93f7db8917ea376cda04effcbb4" }
 protobuf = { git = "https://github.com/pingcap/rust-protobuf", branch = "v2.8" }
 protobuf-codegen = { git = "https://github.com/pingcap/rust-protobuf", branch = "v2.8" }
 
diff --git a/Makefile b/Makefile
index 4eaba281..d759c514 100644
--- a/Makefile
+++ b/Makefile
@@ -43,9 +43,9 @@ format:
 ## Run clippy.
 clippy:
 ifdef WITH_NIGHTLY_FEATURES
-	cargo ${TOOLCHAIN_ARGS} clippy --all --all-features --all-targets -- -D clippy::all
+	cargo ${TOOLCHAIN_ARGS} clippy --all --all-features --all-targets ${EXTRA_CARGO_ARGS} -- -D clippy::all
 else
-	cargo ${TOOLCHAIN_ARGS} clippy --all --features all_stable --all-targets -- -D clippy::all
+	cargo ${TOOLCHAIN_ARGS} clippy --all --features all_stable --all-targets ${EXTRA_CARGO_ARGS} -- -D clippy::all
 endif
 
 ## Run tests.
diff --git a/ctl/Cargo.toml b/ctl/Cargo.toml
index c10b092e..f8b29b56 100644
--- a/ctl/Cargo.toml
+++ b/ctl/Cargo.toml
@@ -9,6 +9,6 @@ repository = "https://github.com/tikv/raft-engine"
 license = "Apache-2.0"
 
 [dependencies]
-clap = { version = "3.1", features = ["derive", "cargo"] }
-env_logger = "0.10"
-raft-engine = { path = "..", version = "0.3.0", features = ["scripting", "internals"] }
+clap = { version = "3.1.6", features = ["derive", "cargo"] }
+env_logger = "0.10.0"
+raft-engine = { path = "..", features = ["scripting", "internals"] }
diff --git a/src/purge.rs b/src/purge.rs
index 94c57064..aa799361 100644
--- a/src/purge.rs
+++ b/src/purge.rs
@@ -35,6 +35,10 @@ fn max_batch_bytes() -> usize {
     128 * 1024
 }
 
+fn max_forcely_sync_bytes() -> usize {
+    max_batch_bytes() * 4
+}
+
 pub struct PurgeManager<P>
 where
     P: PipeLog,
@@ -338,6 +342,7 @@ where
             let mut current_entry_indexes = Vec::new();
             let mut current_entries = Vec::new();
             let mut current_size = 0;
+            let mut unsynced_size = 0;
             // Split the entries into smaller chunks, so that we don't OOM, and the
             // compression overhead is not too high.
             let mut entry_indexes = entry_indexes.into_iter().peekable();
@@ -346,6 +351,7 @@ where
                 current_size += entry.len();
                 current_entries.push(entry);
                 current_entry_indexes.push(ei);
+                unsynced_size += current_size;
                 // If this is the last entry, we handle them outside the loop.
                 if entry_indexes.peek().is_some()
                     && current_size + previous_size > max_batch_bytes()
@@ -380,7 +386,15 @@ where
                     )?;
                     current_size = 0;
                     previous_size = 0;
-                    self.rewrite_impl(&mut log_batch, rewrite, false)?;
+                    let sync = if unsynced_size >= max_forcely_sync_bytes() {
+                        // Avoiding too many unsynced size can make the later `fdatasync` in
+                        // the append progress blocked for too long.
+                        unsynced_size = 0;
+                        true
+                    } else {
+                        false
+                    };
+                    self.rewrite_impl(&mut log_batch, rewrite, sync)?;
                 }
             }
             log_batch.add_raw_entries(region_id, current_entry_indexes, current_entries)?;
diff --git a/stress/Cargo.toml b/stress/Cargo.toml
index e89c92a5..b3e2e9dc 100644
--- a/stress/Cargo.toml
+++ b/stress/Cargo.toml
@@ -5,12 +5,14 @@ authors = ["The TiKV Authors"]
 edition = "2018"
 
 [dependencies]
-clap = { version = "3.1", features = ["derive", "cargo"] }
+clap = { version = "3.1.6", features = ["derive", "cargo"] }
 const_format = "0.2.13"
 hdrhistogram = "7.4"
-num-traits = "0.2"
-parking_lot_core = "0.9"
-raft = { git = "https://github.com/tikv/raft-rs", branch = "master", default-features = false, features = ["protobuf-codec"] }
+num-traits = "0.2.14"
+parking_lot_core = "0.9.1"
+raft = { git = "https://github.com/tikv/raft-rs", rev = "f60fb9e143e5b93f7db8917ea376cda04effcbb4", default-features = false, features = [
+    "protobuf-codec",
+] }
 raft-engine = { path = "..", features = ["internals"] }
 rand = "0.8"
 rand_distr = "0.4"