StormCrawler的原型拓扑不提取外部链接

Question

根据我的理解，这个基本示例应该能够爬行和获取页面。

我在http://stormcrawler.net/getting-started/上学习了这个例子，但是爬虫似乎只获取了几个页面，然后就什么也不做了。

我想爬行http://books.toscrape.com/并运行爬行，但是在日志中看到只有第一个页面被抓取，还有一些被发现，但没有被抓取：

8010 [Thread-34-parse-executor[5 5]] INFO  c.d.s.b.JSoupParserBolt - Parsing : starting http://books.toscrape.com/
8214 [Thread-34-parse-executor[5 5]] INFO  c.d.s.b.JSoupParserBolt - Parsed http://books.toscrape.com/ in 182 msec
content 1435 chars
url     http://books.toscrape.com/
domain  toscrape.com
description
title   All products | Books to Scrape - Sandbox
http://books.toscrape.com/catalogue/category/books/new-adult_20/index.html      DISCOVERED      Thu Apr 05 13:46:01 CEST 2018
        url.path: http://books.toscrape.com/
        depth: 1

http://books.toscrape.com/catalogue/the-dirty-little-secrets-of-getting-your-dream-job_994/index.html   DISCOVERED      Thu Apr 05 13:46:01 CEST 2018
        url.path: http://books.toscrape.com/
        depth: 1

http://books.toscrape.com/catalogue/category/books/thriller_37/index.html       DISCOVERED      Thu Apr 05 13:46:01 CEST 2018
        url.path: http://books.toscrape.com/
        depth: 1

http://books.toscrape.com/catalogue/category/books/academic_40/index.html       DISCOVERED      Thu Apr 05 13:46:01 CEST 2018
        url.path: http://books.toscrape.com/
        depth: 1

http://books.toscrape.com/catalogue/category/books/classics_6/index.html        DISCOVERED      Thu Apr 05 13:46:01 CEST 2018
        url.path: http://books.toscrape.com/
        depth: 1

http://books.toscrape.com/catalogue/category/books/paranormal_24/index.html     DISCOVERED      Thu Apr 05 13:46:01 CEST 2018
        url.path: http://books.toscrape.com/
        depth: 1



....




17131 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      6:partitioner URLPartitioner           {}
17164 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      8:spout       queue_size               0
17403 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      5:parse       JSoupParserBolt          {tuple_success=1, outlink_kept=73}
17693 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      3:fetcher     num_queues               0
17693 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      3:fetcher     fetcher_average_perdoc   {time_in_queues=265.0, bytes_fetched=51294.0, fetch_time=52.0}
17693 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      3:fetcher     fetcher_counter          {robots.fetched=1, bytes_fetched=51294, fetched=1}
17693 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      3:fetcher     activethreads            0
17693 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      3:fetcher     fetcher_average_persec   {bytes_fetched_perSec=5295.137813564571, fetched_perSec=0.10323113451016827}
17693 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928770        172.18.25.22:1024      3:fetcher     in_queues                0
27127 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      6:partitioner URLPartitioner           {}
27168 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      8:spout       queue_size               0
27405 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      5:parse       JSoupParserBolt          {tuple_success=0, outlink_kept=0}
27695 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      3:fetcher     num_queues               0
27695 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      3:fetcher     fetcher_average_perdoc   {}
27695 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      3:fetcher     fetcher_counter          {robots.fetched=0, bytes_fetched=0, fetched=0}
27695 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      3:fetcher     activethreads            0
27696 [Thread-39] INFO  o.a.s.m.LoggingMetricsConsumer - 1522928780        172.18.25.22:1024      3:fetcher     fetcher_average_persec   {bytes_fetched_perSec=0.0, fetched_perSec=0.0}

没有修改配置文件。包括爬虫。另外，标志parser.emitOutlinks应该是真的，因为这是爬行器-default.yaml的默认设置。

在另一个项目中，我还学习了youtube关于elasticsearch的教程。在这里，我也遇到了一个问题，就是根本没有任何页面被获取和索引。

爬虫没有抓取任何页面的错误在哪里？

Answer 1

由工件生成的拓扑仅仅是一个示例，并使用StdOutStatusUpdater，它只是将发现的URL转储到控制台。如果您是在本地模式下运行或使用单个工作人员，则可以使用MemoryStatusUpdater，因为它将向MemorySpout添加已发现的URL，然后依次对这些URL进行处理。

请注意，当您终止拓扑或拓扑崩溃时，这不会保留有关URL的信息。同样，这只是用于调试，并作为使用StormCrawler的初始步骤。

如果希望持久化URL，可以使用任何持久性后端(SOLR/ Elasticsearch，SQL)。可以把你和ES的问题描述成一个单独的问题。