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To avoid the lost update anomaly, the write sets of the concurrent TXNs should not intersect.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright 2024-present The Sekas Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| mod helper; | ||
|
|
||
| use std::time::Duration; | ||
|
|
||
| use helper::client::ClusterClient; | ||
| use helper::context::TestContext; | ||
| use helper::init::setup_panic_hook; | ||
| use helper::runtime::spawn; | ||
| use log::info; | ||
| use sekas_client::{AppError, Database, TableDesc, Txn, WriteBuilder}; | ||
| use sekas_rock::fn_name; | ||
|
|
||
| const DB: &str = "DB"; | ||
| const TABLE_A: &str = "TABLE_A"; | ||
| const TABLE_B: &str = "TABLE_B"; | ||
|
|
||
| #[ctor::ctor] | ||
| fn init() { | ||
| setup_panic_hook(); | ||
| tracing_subscriber::fmt::init(); | ||
| } | ||
|
|
||
| /// build a cluster and create a DB and two table. | ||
| async fn bootstrap_servers_and_tables( | ||
| name: &str, | ||
| ) -> (TestContext, ClusterClient, Database, TableDesc, TableDesc) { | ||
| let mut ctx = TestContext::new(name); | ||
| let nodes = ctx.bootstrap_servers(3).await; | ||
| let c = ClusterClient::new(nodes).await; | ||
| let app = c.app_client().await; | ||
|
|
||
| let db = app.create_database(DB.to_string()).await.unwrap(); | ||
| let table_a = db.create_table(TABLE_A.to_string()).await.unwrap(); | ||
| let table_b = db.create_table(TABLE_B.to_string()).await.unwrap(); | ||
| c.assert_table_ready(table_a.id).await; | ||
| c.assert_table_ready(table_b.id).await; | ||
|
|
||
| // ATTN: here is an assumption, two table would not be optimized in one txn | ||
| // batch write. | ||
|
|
||
| (ctx, c, db, table_a, table_b) | ||
| } | ||
|
|
||
| #[sekas_macro::test] | ||
| async fn test_lost_update_anomaly() { | ||
| // The constraint: | ||
| // r1[x]...w2[x]...w1[x]...c1 | ||
|
|
||
| let (ctx, c, db, table_a, _table_b) = bootstrap_servers_and_tables(fn_name!()).await; | ||
|
|
||
| let table_a = table_a.id; | ||
| let loop_times = 100; | ||
|
|
||
| let db_clone = db.clone(); | ||
| let bumper_a = spawn(async move { | ||
| for i in 0..loop_times { | ||
| loop { | ||
| let mut txn = db_clone.begin_txn(); | ||
| let value = read_i64(&txn, table_a, table_a.to_string().into_bytes()).await; | ||
| let a = value & 0x0000FFFF; | ||
| let b = value & 0xFFFF0000; | ||
| if a != i { | ||
| panic!("a = {}, i = {}, b = {}, the lost update anomaly is exists", a, i, b); | ||
| } | ||
| let value = b | (a + 1); | ||
|
|
||
| let put = WriteBuilder::new(table_a.to_string().into_bytes()) | ||
| .ensure_put(value.to_be_bytes().to_vec()); | ||
| txn.put(table_a, put); | ||
| match txn.commit().await { | ||
| Ok(_) => break, | ||
| Err(AppError::TxnConflict) => { | ||
| info!("bumper a txn is conflict, retry later ..."); | ||
| } | ||
| Err(err) => panic!("commit txn: {err:?}"), | ||
| } | ||
| } | ||
| sekas_runtime::time::sleep(Duration::from_millis(5)).await; | ||
| } | ||
| }); | ||
|
|
||
| let db_clone = db.clone(); | ||
| let bumper_b = spawn(async move { | ||
| for i in 0..loop_times { | ||
| loop { | ||
| let mut txn = db_clone.begin_txn(); | ||
| let value = read_i64(&txn, table_a, table_a.to_string().into_bytes()).await; | ||
| let a = value & 0x0000FFFF; | ||
| let b = (value & 0xFFFF0000) >> 16; | ||
| if b != i { | ||
| panic!("b = {}, i = {}, a = {}, the lost update anomaly is exists", b, i, a); | ||
| } | ||
| let value = a | ((b + 1) << 16); | ||
|
|
||
| let put = WriteBuilder::new(table_a.to_string().into_bytes()) | ||
| .ensure_put(value.to_be_bytes().to_vec()); | ||
| txn.put(table_a, put); | ||
| match txn.commit().await { | ||
| Ok(_) => break, | ||
| Err(AppError::TxnConflict) => { | ||
| info!("bumper b txn is conflict, retry later ..."); | ||
| } | ||
| Err(err) => panic!("commit txn: {err:?}"), | ||
| } | ||
| } | ||
| sekas_runtime::time::sleep(Duration::from_millis(3)).await; | ||
| } | ||
| }); | ||
|
|
||
| bumper_a.await.unwrap(); | ||
| bumper_b.await.unwrap(); | ||
|
|
||
| let txn = db.begin_txn(); | ||
| let value = read_i64(&txn, table_a, table_a.to_string().into_bytes()).await; | ||
| assert_eq!(value, (100 << 16) | 100); | ||
|
|
||
| drop(c); | ||
| drop(ctx); | ||
| } | ||
|
|
||
| async fn read_i64(txn: &Txn, table_id: u64, key: Vec<u8>) -> i64 { | ||
| match txn.get(table_id, key).await.unwrap() { | ||
| Some(bytes) => sekas_rock::num::decode_i64(&bytes).unwrap(), | ||
| None => 0, | ||
| } | ||
| } |