[jira] Closed: (NUTCH-721) Fetcher2 Slow

["Doğacan Güney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doğacan Güney closed NUTCH-721.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 1.1
         Assignee: Doğacan Güney

Code committed as of rev. 807485.

I am closing this issue. Of course, there may be other reasons why Fetcher2 is slow, so feel free to create new issues if so.

> Fetcher2 Slow
> -------------
>
>                 Key: NUTCH-721
>                 URL: https://issues.apache.org/jira/browse/NUTCH-721
>             Project: Nutch
>          Issue Type: Bug
>          Components: fetcher
>    Affects Versions: 1.0.0
>         Environment: Fedora Core r6, Kernel 2.6.22-14,  jdk1.6.0_12
>            Reporter: Roger Dunk
>            Assignee: Doğacan Güney
>             Fix For: 1.1
>
>         Attachments: crawl_generate.tar.gz, NUTCH-721.patch, nutch-site.xml
>
>
> Fetcher2 fetches far more slowly than Fetcher1.
> Config options:
> fetcher.threads.fetch = 80
> fetcher.threads.per.host = 80
> fetcher.server.delay = 0
> generate.max.per.host = 1
> With a queue size of ~40,000, the result is:
> activeThreads=80, spinWaiting=79, fetchQueues.totalSize=0
> with maybe a download of 1 page per second.
> Runing with -noParse makes little difference.
> CPU load average is around 0.2. With Fetcher1 CPU load is around 2.0 - 3.0
> Hosts already cached by local caching NS appear to download quickly upon a re-fetch, so possible issue relating to NS lookups, however all things being equal Fetcher1 runs fast without pre-caching hosts.

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