如果我的记录少于4000，以下代码可以正常工作。
async.eachSeries(results, function (item, innerCallback) {
if (item[lang]) {
document = item[lang];
document._id = item._id;
documents.push(document);
innerCallback();
}else{
innerCallback();
}
}, function (err) {
if (err) {
console.log('Error in processing')
return callback(err);
} else {
return callback(null, documents);
}
});
如果我有超过4000条记录，则会出现以下错误。
"domain": {
"domain": null,
"_events": {},
"_maxListeners": 10,
"members": [{
"_readableState": {
"highWaterMark": 16384,
"buffer": [],
"length": 0,
"pipes": null,
"pipesCount": 0,
"flowing": false,
"ended": true,
"endEmitted": true,
"reading": false,
"calledRead": true,
"sync": false,
"needReadable": true,
"emittedReadable": false,
"readableListening": false,
"objectMode": false,
"defaultEncoding": "utf8",
"ranOut": false,
"awaitDrain": 0,
"readingMore": false,
"oldMode": true,
"decoder": null,
"encoding": null
},
"readable": false,
"domain": "[Circular]",
"_events": {},
"_maxListeners": 1000,
"socket": {
"_connecting": false,
"_handle": {
"fd": null,
"writeQueueSize": 0,
"owner": "[Circular]",
"reading": true
},
"_readableState": {
"highWaterMark": 16384,
"buffer": [],
"length": 0,
"pipes": null,
"pipesCount": 0,
"flowing": false,
"ended": false,
"endEmitted": false,
"reading": true,
"calledRead": true,
"sync": false,
"needReadable": true,
"emittedReadable": false,
"readableListening": false,
"objectMode": false,
"defaultEncoding": "utf8",
"ranOut": false,
"awaitDrain": 0,
"readingMore": false,
"oldMode": false,
"decoder": null,
"encoding": null
},
"readable": true,
"domain": null,
"_events": {
"drain": [null, null],
"close": [null, null]
},
"_maxListeners": 10,
"_writableState": {
"highWaterMark": 16384,
"objectMode": false,
"needDrain": false,
"ending": false,
"ended": false,
"finished": false,
"decodeStrings": false,
"defaultEncoding": "utf8",
"length": 0,
"writing": false,
"sync": true,
"bufferProcessing": false,
"writecb": null,
"writelen": 0,
"buffer": [],
"errorEmitted": false
},
"writable": true,
"allowHalfOpen": true,
"destroyed": false,
"bytesRead": 423,
"_bytesDispatched": 0,
"_pendingData": null,
"_pendingEncoding": "",
"server": {
"domain": null,
"_events": {
"connection": [null, null],
"clientError": [null, null],
"listening": [null]
},
"_maxListeners": 10,
"_connections": 2,
"connections": 2,
"_handle": {
"fd": null,
"writeQueueSize": 0,
"owner": "[Circular]"
},
"_usingSlaves": false,
"_slaves": [],
"allowHalfOpen": true,
"httpAllowHalfOpen": false,
"timeout": 120000,
"_connectionKey": "4:0.0.0.0:8500"
},
"_idleTimeout": 120000,
"_idleNext": {
"_idleNext": {
"_connecting": false,
"_handle": {
"fd": null,
"writeQueueSize": 0,
"owner": "[Circular]",
"reading": true
},
"_readableState": {
"highWaterMark": 16384,
"buffer": [],
"length": 0,
"pipes": null,
"pipesCount": 0,
"flowing": false,
"ended": false,
"endEmitted": false,
"reading": true,
"calledRead": true,
"sync": false,
"needReadable": true,
"emittedReadable": false,
"readableListening": false,
"objectMode": false,
"defaultEncoding": "utf8",
"ranOut": false,
"awaitDrain": 0,
"readingMore": false,
"oldMode": false,
"decoder": null,
"encoding": null
},
"readable": true,
"domain": null,
"_events": {
"drain": [null, null]
},
"_maxListeners": 10,
"_writableState": {
"highWaterMark": 16384,
"objectMode": false,
"needDrain": false,
"ending": false,
"ended": false,
"finished": false,
"decodeStrings": false,
"defaultEncoding": "utf8",
"length": 0,
"writing": false,
"sync": true,
"bufferProcessing": false,
"writecb": null,
"writelen": 0,
"buffer": [],
"errorEmitted": false
},
"writable": true,
"allowHalfOpen": true,
"destroyed": false,
"bytesRead": 0,
"_bytesDispatched": 0,
"_pendingData": null,
"_pendingEncoding": "",
"server": "[Circular]",
"_idleTimeout": 120000,
"_idleNext": "[Circular]",
"_idlePrev": "[Circular]",
"_idleStart": 1419317275504,
"parser": {
"_headers": [],
"_url": "",
"socket": "[Circular]",
"incoming": null,
"maxHeaderPairs": 2000
},
"_paused": false
},
"_idlePrev": "[Circular]"
},
"_idlePrev": "[Circular]",
"_idleStart": 1419317275251,
"parser": {
"_headers": [],
"_url": "",
"socket": "[Circular]",
"incoming": "[Circular]",
"maxHeaderPairs": 2000
},
"_paused": false,
"_httpMessage": {
"domain": "[Circular]",
"_events": {},
"_maxListeners": 10,
"output": [],
"outputEncodings": [],
"writable": true,
"_last": false,
"chunkedEncoding": false,
"shouldKeepAlive": true,
"useChunkedEncodingByDefault": true,
"sendDate": true,
"_headerSent": false,
"_header": "",
"_hasBody": true,
"_trailer": "",
"finished": false,
"_hangupClose": false,
"socket": "[Circular]",
"connection": "[Circular]",
"log": {
"domain": null,
"_events": {},
"_maxListeners": 10,
"_level": 30,
"streams": [{
"level": 30,
"path": "E:\\vidyartha-com\\trunk\\node\\businessapp\\businessapp.log",
"type": "rotating-file",
"period": "1d",
"count": 7,
"raw": false,
"stream": {
"path": "E:\\vidyartha-com\\trunk\\node\\businessapp\\businessapp.log",
"stream": {
"_writableState": {
"highWaterMark": 16384,
"objectMode": false,
"needDrain": false,
"ending": false,
"ended": false,
"finished": false,
"decodeStrings": true,
"defaultEncoding": "utf8",
"length": 0,
"writing": false,
"sync": false,
"bufferProcessing": false,
"writecb": null,
"writelen": 0,
"buffer": [],
"errorEmitted": false
},
"writable": true,
"domain": null,
"_events": {},
"_maxListeners": 10,
"path": "E:\\vidyartha-com\\trunk\\node\\businessapp\\businessapp.log",
"fd": 3,
"flags": "a",
"mode": 438,
"bytesWritten": 11626
},
"count": 7,
"periodNum": 1,
"periodScope": "d",
"rotQueue": [],
"rotating": false,
"rotAt": 1419379200000,
"timeout": {
"_idleTimeout": 61943637,
"_idlePrev": {
"_idleTimeout": 61943637,
"_idlePrev": {
"_idleNext": "[Circular]",
"_idlePrev": "[Circular]",
"msecs": 61943637
},
"_idleNext": "[Circular]",
"_idleStart": 1419317256363,
"_repeat": false
},
"_idleNext": "[Circular]",
"_idleStart": 1419317256363,
"_repeat": false
}
},
"closeOnExit": true
}, {
"level": 50,
"path": "E:\\vidyartha-com\\trunk\\node\\businessapp\\businessapp_error.log",
"type": "rotating-file",
"period": "1d",
"count": 7,
"raw": false,
"stream": {
"path": "E:\\vidyartha-com\\trunk\\node\\businessapp\\businessapp_error.log",
"stream": {
"_writableState": {
"highWaterMark": 16384,
"objectMode": false,
"needDrain": false,
"ending": false,
"ended": false,
"finished": false,
"decodeStrings": true,
"defaultEncoding": "utf8",
"length": 0,
"writing": false,
"sync": true,
"bufferProcessing": false,
"writecb": null,
"writelen": 0,
"buffer": [],
"errorEmitted": false
},
"writable": true,
"domain": null,
"_events": {},
"_maxListeners": 10,
"path": "E:\\vidyartha-com\\trunk\\node\\businessapp\\businessapp_error.log",
"fd": 4,
"flags": "a",
"mode": 438,
"bytesWritten": 0
},
"count": 7,
"periodNum": 1,
"periodScope": "d",
"rotQueue": [],
"rotating": false,
"rotAt": 1419379200000,
"timeout": "[Circular]"
},
"closeOnExit": true
}],
"serializers": {},
"src": false,
"fields": {
"name": "businessapp",
"hostname": "rakesh",
"pid": 7176
},
"haveNonRawStreams": true
},
"_time": 1419317275253,
"acceptable": ["application/json", "text/plain", "application/octet-stream", "application/javascript"],
"formatters": {},
"req": "[Circular]",
"serverName": "businessapp",
"methods": ["GET"],
"_headers": {
"content-encoding": "gzip"
},
"_headerNames": {
"content-encoding": "Content-Encoding"
},
"locale": "en",
"_charSet": "utf-8",
"contentType": "json"
},
"_peername": {
"address": "127.0.0.1",
"family": "IPv4",
"port": 62452
}
},
"connection": "[Circular]",
"httpVersion": "1.1",
"complete": true,
"headers": {
"host": "localhost:8500",
"connection": "keep-alive",
"user-agent": "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36",
"content-type": "text/plain; charset=utf-8",
"accept": "*/*",
"accept-encoding": "gzip, deflate, sdch",
"accept-language": "en-GB,en-US;q=0.8,en;q=0.6",
"cookie": "ATOKEN=fe8c94a1-de6d-440c-82d7-871ef71e391b"
},
"trailers": {},
"_pendings": [],
"_pendingIndex": 0,
"url": "/business/services/updateAptitudeResults?lang=en",
"method": "GET",
"statusCode": null,
"client": "[Circular]",
"_consuming": true,
"_dumped": false,
"httpVersionMajor": 1,
"httpVersionMinor": 1,
"upgrade": false,
"log": "[Circular]",
"_time": 1419317275253,
"timers": [{
"name": "parseAccept",
"time": [0, 2185089]
}, {
"name": "parseAuthorization",
"time": [0, 269017]
}, {
"name": "parseDate",
"time": [0, 204734]
}, {
"name": "parseQueryString",
"time": [0, 2522171]
}, {
"name": "readBody",
"time": [0, 2562685]
}, {
"name": "parseJson",
"time": [0, 220940]
}, {
"name": "gzip",
"time": [0, 4035797]
}, {
"name": "i18nInit",
"time": [0, 1456906]
}, {
"name": "rateLimit",
"time": [0, 557481]
}, {
"name": "handler-9",
"time": [0, 308992]
}],
"_version": "*",
"_url": {
"protocol": null,
"slashes": null,
"auth": null,
"host": null,
"port": null,
"hostname": null,
"hash": null,
"search": "?lang=en",
"query": "lang=en",
"pathname": "/business/services/updateAptitudeResults",
"path": "/business/services/updateAptitudeResults?lang=en",
"href": "/business/services/updateAptitudeResults?lang=en"
},
"_path": "/business/services/updateAptitudeResults",
"params": {
"lang": "en",
"rbody": ""
},
"context": "[Circular]",
"route": {
"path": "/business/services/updateAptitudeResults",
"method": "GET",
"versions": [],
"name": "getbusinessservicesupdateaptituderesults"
},
"_negotiator": {
"request": {
"headers": {
"accept": "*/*",
"accept-encoding": "gzip, deflate, sdch"
}
}
},
"authorization": {},
"username": "anonymous",
"_query": {
"lang": "en"
},
"query": "[Circular]",
"_clen": false,
"_contentType": "text/plain",
"body": "",
"languages": ["en", "en", "en"],
"regions": ["gb", "us"],
"language": "en",
"region": "gb",
"locale": "en",
"unauthorized": true
}, "[Circular]"]
},
"domainThrown": true
答案 0 :(得分：0)
eachLimit可以解决问题：
eachLimit（arr，limit，iterator，callback）
与每个相同，只有不超过限制迭代器 随时同时运行。
答案 1 :(得分：0)
尝试使用：
mapSeries(arr, iterator, callback);它可以解决您的问题。
另见：https://github.com/caolan/async#mapseriesarr-iterator-callback