Mongodb错误失败24：打开的文件太多：使用pymongo

Question

我的代码造成了相当大的流量，其中包含大量查找、更新、map reduce 和 createIndex 操作，所以我不确定哪一个可能是罪魁祸首，但我收到以下错误：

_create_global_word_frequency_collection
    full_response=True)
  File "/Users/arj/anaconda/lib/python2.7/site-packages/pymongo/collection.py", line 1857, in map_reduce
    sock_info, cmd, slave_ok, ReadPreference.PRIMARY)
  File "/Users/arj/anaconda/lib/python2.7/site-packages/pymongo/collection.py", line 205, in _command
    read_concern=read_concern)
  File "/Users/arj/anaconda/lib/python2.7/site-packages/pymongo/pool.py", line 211, in command
    read_concern)
  File "/Users/arj/anaconda/lib/python2.7/site-packages/pymongo/network.py", line 100, in command
    helpers._check_command_response(response_doc, msg, allowable_errors)
  File "/Users/arj/anaconda/lib/python2.7/site-packages/pymongo/helpers.py", line 196, in _check_command_response
    raise OperationFailure(msg % errmsg, code, response)
pymongo.errors.OperationFailure: command SON([('mapreduce', u'verbatimterms'), ('map', Code('\n                    function(){\n                        this.terms.forEach(function(item){\n                        emit(item, 1)\n                    })\n                }\n                ', {})), ('reduce', Code('\n                    function(key, counts){\n                        return Array.sum(counts)\n                    }\n                ', {})), ('out', SON([('replace', 'reconversations_topic_3'), ('db', 'wcterms')])), ('query', {'topic': 'reconversations_topic_3'})]) on namespace indexes.$cmd failed: 24: Too many open files

出现这种错误的原因可能是什么？

Answer 1

根据文档，您将增加ulimit。您可以通过在系统提示符下运行以下命令来做到这一点。我使用了推荐的值，但如果需要，您可以增加它。

ulimit -n 64000

运行此命令后，需要重启 MongoDB 服务。