One reason to store content is if you want to show snippets in search
results.
Another reason is if you want to have a "cached" feature where you can
give the user the page as it looked when you crawled it (it may since
have disappeared.
There is a way to tell nutch to look at only the beginning of a file,
it's this section in your config.xml:
<property>
<name>file.content.limit</name>
<value>65536</value>
<description>The length limit for downloaded content, in bytes.
If this value is nonnegative (>=0), content longer than it will be
truncated;
otherwise, no truncation at all.
</description>
</property>
this is from the nutch-default.xml in 0.9, don't know whether it has
changed in 1.0 .
On Mar 3, 2009, at 8:27 PM, [email protected] wrote:
Hi,
I also noticed that we can disable storing content of pages which I
use. I wonder why someone needs to store content? Also, in case of
files, is there a way to tell nutch not to download the whole file
but let say 1000 bytes from the beginning and parse and index
information only in that part of files?
Thanks.
A.
-----Original Message-----
From: yanky young <[email protected]>
To: [email protected]
Sent: Tue, 3 Mar 2009 6:41 pm
Subject: Re: what is needed to index for about 10000 domains
Hi:
Dog cutting has ever write a wiki about hardware requirement of
nutch, you
can check it out
http://wiki.apache.org/nutch/HardwareRequirements
good luck
yanky
2009/3/4 John Martyniak <[email protected]>
Regarding the machine, you could run it on anything, it all
depends what
kind of performance you want. So yes you could run it on the
machine that
you have or something like the linux machine that I have. And the
DSL
connection should be fine, you just need to make sure that it stays
up the
whole time, because if not it will start erring out, and you will
have to
re-fetch that whole segment as there is no way to pick up from
where you
left off.
The only reason that I merged the segments was that I had many of
them, and
I wanted to build a big one before I started creating new ones,
another
advantage of merging is that you can use that to clear out unwanted
urls.
For example I had a bunch of .js files in there, that I didn't want
to have
as part of the index, so I cleared them out.
I used "bin/nutch mergesegs".
Regarding merging the other parts, I have never used, but I don't
think
that it is necessary unless you have multiple linkdbs, etc. in my
case I do
not.
-John
On Mar 3, 2009, at 7:14 PM, [email protected] wrote:
Hi,
I will need to index all links in domains then. What do you think
a linux
box like yours with DSL connection is OK to index the domains I
have?
Why only segments? I thought we need to merge all sub folders
under crawl
folder. What did you use for merging them?
Thanks.
A.
-----Original Message-----
From: John Martyniak <[email protected]>
To: [email protected]
Sent: Tue, 3 Mar 2009 3:21 pm
Subject: Re: what is needed to index for about 10000 domains
Well the way that nutch works is that you would inject your list of
domains into the DB, and that would be the starting point. Since
nutch uses
a crawler it would grab those pages, and determine if there are
any links on
those pages, and then add them to the DB. So the next time that you
generated your urls to fetch, it would take your original list,
plus the
ones that it found to generate the new segment.?
?
If you wanted to limit it to only pages contained on your 10000
domains,
you could use the regex-urlfilter.txt file in the conf directory
to limit it
to your list. But you would have to create a regular expression
for each
one.?
?
I am not familiar with the merge script on the wiki, but have merged
segments before and it did work. But that was on Linux, don't
think that
should make a difference though.?
?
-John?
?
?
On Mar 3, 2009, at 5:10 PM, [email protected] wrote:?
?
?
Hi,?
?
Thanks for the reply. I have list? of those domains only. I am not
> sure
how many pages they have. Is a DSL? connection sufficient to >
run nutch in
my case. Did you run nutch for all of your pages at > once or
separately for
a given subset of them. Btw, yesterday I > tried to use merge
shell script
that we have on wiki. It gave a lot > of errors. I run it on
cygwin though.?
?
Thanks.?
A.?
?
?
?
?
?
?
?
-----Original Message-----?
From: John Martyniak <[email protected]>?
To: [email protected]?
Sent: Tue, 3 Mar 2009 1:44 pm?
Subject: Re: what is needed to index for about 10000 domains?
?
?
?
?
?
?
?
?
?
I think that in order to answer that questions, it is necessary to
> know
how many total pages are being indexed.??
??
?
I currently have ~3.5 million pages indexed, and the segment >
directories are around 45GB, The response time is relatively
fast.??
??
?
In the test site it is running on a dual processor Dell 1850 with
> 3GB
of RAM.??
??
?
-John??
??
?
On Mar 3, 2009, at 3:44 PM, [email protected] wrote:??
??
?
Hello,??
?
??
?
I use nutch-0.9 and need to index about 10000? domains.? I want to
>> >
know? minimum requirements to hardware and memory.??
?
??
?
Thanks in advance.??
?
Alex.??
??
?
?
?
?
?
?
