是否有可能在mongo中获得地图缩小进度通知?

问题描述

在蒙哥，Map Reduce很慢.那是给定的.因此，我想知道是否有可能收到地图缩小进度通知.

Map Reduce is slow in Mongo. That is a given. So, I am wondering if it is possible to receive map reduce progress notifications.

谢谢.

推荐答案

我不知道任何内置功能.但是，您可以在单独的脚本中偶尔运行一次db.currentOp()，读取map-reduce进度并通知相关方.

I don't know about any built-in features. You could, however, in a separate script run db.currentOp() every once in a while, read map-reduce progress and notify concerned parties.

这是我所看到的示例:

> db.currentOp()
{
    "inprog" : [
        {
            "opid" : 249198781,
            "active" : true,
            "lockType" : "read",
            "waitingForLock" : false,
            "secs_running" : 14,
            "op" : "query",
            "ns" : "mydb.mycoll",
            "query" : {
                "mapreduce" : "mycoll",
                "map" : function cf__9__f_() {
    emit(this.aid, 1);
},
                "reduce" : function cf__10__f_(k, vals) {
    var result = 0;
    vals.forEach(function (v) {result += v;});
    return result;
},
                "out" : {
                    "inline" : 1
                }
            },
            "client" : "127.0.0.1:44254",
            "desc" : "conn",
            "threadId" : "0x7e98f24e4700",
            "connectionId" : 1958947,
            "msg" : "m/r: (1/3) emit phase 644165/7670157 8%",
            "progress" : {
                "done" : 644165,
                "total" : 7670157
            },
            "numYields" : 644
        }
    ]
}

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