使用以下规则创建了一个表: 因此,数据应在 1 秒后过期(根据文档(
async function createTable() {
console.log("Creating Table");
const options = {
families: [
{
name: 'payloads',
rule: {
age: {
seconds: 1,
nanos: 0,
},
},
},
],
};
try {
await table.create(options);
console.log("Successfully Created Table");
} catch (err) {
console.error(`Error reading rows :`, err);
}
}
然后像这样插入数据:
const rowsToInsert = {
key: "SUMEET",
data: {
payloads: {
'1': {
value: "NOTIFICATIONS_PAYLOAD_1",
timestamp: 1576500927000,
},
'2': {
value: "NOTIFICATIONS_PAYLOAD_2",
timestamp: 1576587327000,
},
'3': {
value: "NOTIFICATIONS_PAYLOAD_3",
timestamp: 1576673727000,
},
'4': {
value: "NOTIFICATIONS_PAYLOAD_4",
timestamp: 1576760127000,
},
},
},
};
await table.insert(rowsToInsert);
所以我添加了四个具有不同时间戳的单元格:
- 首先在写入数据时提前 5 分钟
- 第二名,提前 1 小时
- 第三名,提前1天
- 第四天,提前2天
这里的问题是当M读取数据时,整个列系列数据被删除,但它应该仅根据规则集删除第一个和第二个单元格
有什么遗漏或做错了吗?
问题出在您的时间戳中,您很可能正在设置过去的日期。我建议您使用 javascript 中的日期方法设置日期,而不是像现在这样手动设置它们。
我使用以下代码进行了一些测试:
const Bigtable = require('@google-cloud/bigtable');
const bigtable = Bigtable();
const instance = bigtable.instance([instance]);
const table = instance.table([table]);
const now = new Date();
async function writeSimple() {
var now = new Date(Date.now());
var fiveMinutes = new Date(now.getTime() + 5 * 60000);
var anHour = new Date(now.getTime() + 60 * 60000);
var aDay = new Date(now.getTime() + 24 * 60 * 60000);
var twoDays = new Date(now.getTime() + 48 * 60 * 60000);
const rowsToInsert = {
key: "SUMEET",
data: {
payloads: {
'1': {
value: "NOTIFICATIONS_PAYLOAD_1",
timestamp: now,
},
'2': {
value: "NOTIFICATIONS_PAYLOAD_2",
timestamp: fiveMinutes,
},
'3': {
value: "NOTIFICATIONS_PAYLOAD_3",
timestamp: anHour,
},
'4': {
value: "NOTIFICATIONS_PAYLOAD_4",
timestamp: aDay,
},
'5': {
value: "NOTIFICATIONS_PAYLOAD_5",
timestamp: twoDays,
},
},
},
};
await table.insert(rowsToInsert);
console.log(`Successfully wrote row ${rowsToInsert.key}`);
}
并获得了如下所示的行:
2019/12/17 16:53:33 -creds flag unset, will use gcloud credential
----------------------------------------
SUMEET
payloads:1 @ 2019/12/17-16:30:34.343000
"NOTIFICATIONS_PAYLOAD_1"
payloads:2 @ 2019/12/17-16:35:34.343000
"NOTIFICATIONS_PAYLOAD_2"
payloads:3 @ 2019/12/17-17:30:34.343000
"NOTIFICATIONS_PAYLOAD_3"
payloads:4 @ 2019/12/18-16:30:34.343000
"NOTIFICATIONS_PAYLOAD_4"
payloads:5 @ 2019/12/19-16:30:34.343000
"NOTIFICATIONS_PAYLOAD_5"
垃圾收集器通过后(大约 15 分钟后(,我得到了您想要的结果:
2019/12/17 16:59:47 -creds flag unset, will use gcloud credential
----------------------------------------
SUMEET
payloads:3 @ 2019/12/17-17:30:34.343000
"NOTIFICATIONS_PAYLOAD_3"
payloads:4 @ 2019/12/18-16:30:34.343000
"NOTIFICATIONS_PAYLOAD_4"
payloads:5 @ 2019/12/19-16:30:34.343000
"NOTIFICATIONS_PAYLOAD_5"
我希望你觉得这有用!
您的时间戳以毫秒为单位。 Cloud Bigtable需要微秒(见这里(。 基本上,在所有时间戳的末尾添加"000"。