Question

我有一个使用回送和postgressql的nodejs项目。

我有一个类似的功能handleTrade，只需以30秒的超时时间开始交易，按id查询交易并进行一些更新：

async function handleTrade(id) {
  const { Trade } = app.models;
  const transaction = await Trade.beginTransaction({
    timeout: 30000 // 30 seconds
  });

  try {
    console.log(`${id} - 1`);
    const trade = await Trade.findById(id, { transaction });
    console.log(`${id} - 2`);

    if (trade) {
      // Do some updates with the trade
    }
    transaction.commit();
  } catch (e) {
    console.log(`${id} - 3`, e);
    transaction.rollback();
  }
}

我有一个10个ID的列表，我想异步处理所有ID，并在完成所有操作后打印Done。

async function test(ids) {
  const promises = ids.map(id => handleTrade(id));
  await Promise.all(promises);
  console.log('Done');
  process.exit(0);
}

test([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);

这是日志：

2 - Step 1
3 - Step 1
1 - Step 1
4 - Step 1
6 - Step 1
5 - Step 1
10 - Step 1
9 - Step 1
8 - Step 1
7 - Step 1

-- The process stuck here for 30 seconds (which is the timeout value of the transaction)

2 - Step 2
Unhandled rejection Error: The transaction is not active: 914ca760-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

9 - Step 2
1 - Step 2
3 - Step 2
6 - Step 2
4 - Step 2
5 - Step 2
10 - Step 2
8 - Step 2
Unhandled rejection Error: The transaction is not active: 914e5510-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Unhandled rejection Error: The transaction is not active: 914cce71-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Unhandled rejection Error: The transaction is not active: 914cce70-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Unhandled rejection Error: The transaction is not active: 914cf581-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Unhandled rejection Error: The transaction is not active: 914cf580-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Unhandled rejection Error: The transaction is not active: 914cf582-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Unhandled rejection Error: The transaction is not active: 914cf583-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Unhandled rejection Error: The transaction is not active: 914e5511-b804-11e8-bb6c-094b32725638
    at process.nextTick (/Users/admin/Work/NIX/nix-project/engine/node_modules/loopback-datasource-juggler/lib/transaction.js:202:12)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

7 - Step 2
Done

在第1步之后，进程卡住了30秒，然后在事务超时时，它返回错误The transaction is not active

只有当我有10个id时，才会发生这种情况，如果我只使用9个，它将平稳运行

test([1, 2, 3, 4, 5, 6, 7, 8, 9]);

// Logs
2 - Step 1
4 - Step 1
5 - Step 1
9 - Step 1
7 - Step 1
8 - Step 1
6 - Step 1
1 - Step 1
3 - Step 1
2 - Step 2
4 - Step 2
9 - Step 2
8 - Step 2
1 - Step 2
5 - Step 2
7 - Step 2
6 - Step 2
3 - Step 2
Done

如果您有任何想法，请帮助我。谢谢

Answer 1

尝试编辑您的数据源文件。

示例：我的dataresources.json

旧：

MyImage-641.png

新：

{   
  "db": {
    "url": "${DATABASE_URL}",
    "name": "db",
    "connector": "postgresql"
  }
}

说明：您的问题主要是因为您的连接池用完了，这会增加它的数量。（100只是示例数字，您可以将0更改为您的postgresql配置中定义的最大数字）

当同时开始10个事务时，回送：“未处理的拒绝错误：事务未激活”

1 个答案: