MongoDb-即使使用TTL索引，过期文档也不会删除

解决方案在下面的答案的上下文中，我需要删除别名

{时间戳：{createdAt:'created_at'}）

并且只需要

{timestamps:true}）

在GentooLinux上的MongoDB 2.6.8中，我的文档永远不会在过期后被删除

这是猫鼬的问题，而不是猫鼬的问题。Mongoose正在做它应该做的一切，因为TTL索引存在于我的集合中并且看起来是正确的

如有任何建议，将不胜感激

2015-11-30T12:07:24.056-0600 [TTLMonitor] Running query: query: { expireAfterSeconds: { $exists: true } } sort: {} projection: {} skip: 0 limit: 0
2015-11-30T12:07:24.056-0600 [TTLMonitor] query admin.system.indexes query: { expireAfterSeconds: { $exists: true } } planSummary: EOF ntoreturn:0 ntoskip:0 nscanned:0 nscannedObjects:0 keyUpdates:0 numYields:0 locks(micros) r:419 nreturned:0 reslen:20 0ms
2015-11-30T12:07:24.056-0600 [TTLMonitor] Running query: query: { expireAfterSeconds: { $exists: true } } sort: {} projection: {} skip: 0 limit: 0
2015-11-30T12:07:24.056-0600 [TTLMonitor] Only one plan is available; it will be run but will not be cached. query: { expireAfterSeconds: { $exists: true } } sort: {} projection: {} skip: 0 limit: 0, planSummary: COLLSCAN
2015-11-30T12:07:24.057-0600 [TTLMonitor] query database.system.indexes query: { expireAfterSeconds: { $exists: true } } planSummary: COLLSCAN ntoreturn:0 ntoskip:0 nscanned:12 nscannedObjects:12 keyUpdates:0 numYields:0 locks(micros) r:398 nreturned:4 reslen:508 0ms
2015-11-30T12:07:24.057-0600 [TTLMonitor] TTL: { createdAt: 1 }    { createdAt: { $lt: new Date(1448734044057) } }
2015-11-30T12:07:24.057-0600 [TTLMonitor] Relevant index 0 is kp: { createdAt: 1 } io: { v: 1, key: { createdAt: 1 }, name: "createdAt_1", ns: "database.cpus", expireAfterSeconds: 172800, background: true }
2015-11-30T12:07:24.057-0600 [TTLMonitor] Only one plan is available; it will be run but will not be cached. query: { createdAt: { $lt: new Date(1448734044057) } } sort: {} projection: {} skip: 0 limit: 0, planSummary: IXSCAN { createdAt: 1 }
2015-11-30T12:07:24.058-0600 [TTLMonitor]   TTL deleted: 0

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Gentoo中的MongoDb编译标志：

 - - debug       : Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful
                   backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
 - - kerberos    : Add kerberos support
 - - mms-agent   : Install the MongoDB Monitoring Service agent
 + + ssl         : Add support for Secure Socket Layer connections
 - - static-libs : Build static versions of dynamic libraries as well

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您的TTL索引位于

createdAt

上，而

find

结果显示您正在将时间戳保存到

createdAt
上，我想在编译过程中，JSON中的
createdAt
将在mongodb中的
处创建。不是这样吗？不应该是这样吗？我不认为地图是自动绘制的，看看这篇文章
> db.cpus.find()[0]
{
    "_id" : ObjectId("564561d7e97d7aa00c1b6079"),
    "updatedAt" : ISODate("2015-11-13T04:06:47Z"),
    "created_at" : ISODate("2015-11-13T04:06:47Z"),
    "timestamp" : ISODate("2015-11-13T04:06:49.423Z"),
    "avaiable" : true,
    "status" : "success",
    "metrics" : {
        "1m" : {
            "data" : 0,
            "type" : "n",
            "unit" : "unknown"
        },
        "5m" : {
            "data" : 0.01,
            "type" : "n",
            "unit" : "unknown"
        },
        "15m" : {
            "data" : 0.05,
            "type" : "n",
            "unit" : "unknown"
        }
    },
    "__v" : 0
}
> 

one@demos ~/github/cloudimageshare-monitoring/app/data $ cat models/cpu.js 
var mongoose = require('mongoose');
var CpuSchema = require("../schemas/cpu");

var Cpu = mongoose.model('Cpu', CpuSchema);
module.exports = Cpu;

one@demos ~/github/cloudimageshare-monitoring/app/data $ cat schemas/cpu.js 
var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var CpuSchema = new Schema({
    createdAt: { type: Date, expires: '2d' },
    timestamp : { type : Date, index: true },
    avaiable : Boolean,
    status : String,
    metrics :  { 
        '15m' : {
            data : Number,
            type : { type: String},
            unit : String
        } ,
        '5m' : {
            data : Number,
            type : { type: String},
            unit : String
        },
        '1m' : {
            data : Number,
            type : { type: String},
            unit : String
        }
    }

}, { timestamps: { createdAt: 'created_at' } });

module.exports = CpuSchema;

function saveCpu(cpuResult) {
    var cpu = new Cpu ({
        timestamp : cpuResult.timestamp,
        avaiable : cpuResult.available,
        status : cpuResult.status,
        metrics :  {
            "15m" : {
                      data : cpuResult.metrics["15m"].data,
                      type: cpuResult.metrics["15m"].type,
                      unit: cpuResult.metrics["15m"].unit
                    },
            "5m" : {
                        data : cpuResult.metrics["5m"].data,
                        type: cpuResult.metrics["5m"].type,
                        unit: cpuResult.metrics["5m"].unit
                    },
            "1m" : {
                        data : cpuResult.metrics["1m"].data,
                        type: cpuResult.metrics["1m"].type,
                        unit: cpuResult.metrics["1m"].unit
                    }
        }
    });
    cpu.save(function (err, product, numberAffected) { 
        db_finish(err, product, numberAffected, 
                  cpuResult, "cpuResult") });
}

 - - debug       : Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful
                   backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
 - - kerberos    : Add kerberos support
 - - mms-agent   : Install the MongoDB Monitoring Service agent
 + + ssl         : Add support for Secure Socket Layer connections
 - - static-libs : Build static versions of dynamic libraries as well