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
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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
