缓冲NodeJS中流中的数据以执行大容量插入
如何在NodeJS中有效地缓冲从流到批量插入的事件,而不是从流接收的每个记录的唯一插入。下面是我想到的伪代码:
// Open MongoDB connection
mystream.on('data', (record) => {
// bufferize data into an array
// if the buffer is full (1000 records)
// bulk insert into MongoDB and empty buffer
})
mystream.on('end', () => {
// close connection
})
这看起来现实吗? 有没有可能进行优化?现有的库为此提供了便利?
解决方案
我最终得到了一个无依赖关系的解决方案。
const { MongoClient } = require("mongodb")
const url = process.env.MONGO_URI || "mongodb://localhost:27019";
const connection = MongoClient.connect(url, { useNewUrlParser: true, useUnifiedTopology: true })
Promise.resolve(connection)
.then((db) => {
const dbName = "databaseName";
const collection = 'collection';
const dbo = db.db(dbName);
let buffer = []
stream.on("data", (row: any) => {
buffer.push(row)
if (buffer.length > 10000) {
dbo.collection(collection).insertMany(buffer, {ordered: false});
buffer = []
}
});
stream.on("end", () => {
// insert last chunk
dbo.collection(collection).insertMany(buffer, {ordered: false})
.then(() => {
console.log("Done!");
db.close();
})
});
sas_stream.on("error", (err) => console.log(err));
})
.catch((err) => {
console.log(err)
})
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