两个Scrapy爬虫的例子，一个有内存泄漏，我找不到

Question

这让我抓狂。它驱使我巩固和简化了很多代码，但我就是无法解决问题。这是我写的两个蜘蛛的例子。最上面的一个有内存泄漏，导致内存缓慢扩展直至满。

它们几乎相同，它们使用相同的项目和蜘蛛之外的所有其他东西，所以我认为我的其余代码没有任何问题。我还在这里和那里隔离了一些代码，尝试在最后删除变量。我查看了 scrapy 文档，但仍然感到困惑。任何人有什么魔法可以工作吗？

import scrapy
from wordscrape.items import WordScrapeItem
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
import json


class EnglishWikiSpider(CrawlSpider):

    name='englishwiki'
    allowed_domains = ['en.wikipedia.org']
    start_urls = [
    'http://en.wikipedia.org/wiki/'
    ]

    rules = (
        Rule(SgmlLinkExtractor(allow=('/wiki/', )), callback='parse_it', follow=True),
        )

    def parse_it(self, response):

        the_item = WordScrapeItem()
        # This takes all the text that is in that div and extracts it, only the text, not html tags (see: //text())
        # if it meets the conditions of my regex
        english_text = response.xpath('//*[@id="mw-content-text"]//text()').re(ur'[a-zA-Z\'-]+')

        english_dict = {}
        for i in english_text:
            if len(i) > 1:
                word = i.lower()
                if word in english_dict:
                    english_dict[word] += 1
                else:
                    english_dict[word] = 1

        # Dump into json string and put it in the word item, it will be ['word': {<<jsondict>>}, 'site' : url, ...]
        jsondump = json.dumps(english_dict)
        the_item['word'] = jsondump
        the_item['site'] = response.url
        return the_item

第二个稳定的蜘蛛：

import scrapy
from wordscrape.items import WordScrapeItem
import re
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
import json


class NaverNewsSpider(CrawlSpider):

    name='navernews'
    allowed_domains = ['news.naver.com']
    start_urls = [
    'http://news.naver.com',
    'http://news.naver.com/main/read.nhn?oid=001&sid1=102&aid=0007354749&mid=shm&cid=428288&mode=LSD&nh=20150114125510',
    ]

    rules = (
        Rule(SgmlLinkExtractor(allow=('main/read\.nhn', )), callback='parse_it', follow=True),
        )

    def parse_it(self, response):

        the_item = WordScrapeItem()

        # gets all the text from the listed div and then applies the regex to find all word objects in hanul range
        hangul_syllables = response.xpath('//*[@id="articleBodyContents"]//text()').re(ur'[\uac00-\ud7af]+')

        # Go through all hangul syllables found and adds to value or adds key
        hangul_dict = {}
        for i in hangul_syllables:

            if i in hangul_dict:
                hangul_dict[i] += 1
            else:
                hangul_dict[i] = 1

        jsondump = json.dumps(hangul_dict)
        the_item['word'] = jsondump
        the_item['site'] = response.url
        return the_item

Answer 1

我认为 Jepio 的评论是正确的。我认为 spidder 发现了太多要跟踪的链接，因此不得不将它们全部存储在临时期限内。

编辑：所以，问题是它将所有这些链接存储在内存中而不是磁盘上，它最终会填满我所有的内存。解决方案是运行使用作业目录进行 scrapy，这会强制将它们存储在有大量 space 的磁盘上。

$ scrapy crawl spider -s JOBDIR=somedirname

两个Scrapy爬虫的例子，一个有内存泄漏，我找不到

Example of two Scrapy spiders, one has a memory leak and I can't find it

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