I did see a mention yesterday to a situation involving DIH and large XML
files where is was unusually slow, but if the big XML file was broken into
many smaller files it went really fast for the same amount of data. If that
is the case, you don't need to parse all of the XML, just detect the
boundaries between "documents" and break them into smaller XML files.
-- Jack Krupansky
-----Original Message-----
From: Mike Sokolov
Sent: Wednesday, June 06, 2012 8:02 AM
To: solr-user@lucene.apache.org
Cc: Erick Erickson
Subject: Re: Efficiently mining or parsing data out of XML source files
I agree, that seems odd. We routinely index XML using either
HTMLStripCharFilter, or XmlCharFilter (see patch:
https://issues.apache.org/jira/browse/SOLR-2597), both of which parse
the XML, and we don't see such a huge speed difference from indexing
other field types. XmlCharFilter also allows you to specify which
elements to index if you don't want the whole file.
-Mike
On 6/3/2012 8:42 AM, Erick Erickson wrote:
This seems really odd. How big are these XML files? Where are you parsing
them?
You could consider using a SolrJ program with a SAX-style parser.
But the first question I'd answer is "what is slow?". The implications
of your post is that
parsing the XML is the slow part, it really shouldn't be taking
anywhere near this long IMO...
Best
Erick
On Thu, May 31, 2012 at 9:14 AM, Van Tassell, Kristian
<kristian.vantass...@siemens.com> wrote:
I'm just wondering what the general consensus is on indexing XML data to
Solr in terms of parsing and mining the relevant data out of the file and
putting them into Solr fields. Assume that this is the XML file and
resulting Solr fields:
XML data:
<mydoc id="1234">
<title>foo</title>
<bar attr1="val1"/>
<baz>garbage data</baz>
</ mydoc>
Solr Fields:
Id=1234
Title=foo
Bar=val1
I'd previously set this process up using XSLT and have since tested using
XMLBeans, JAXB, etc. to get the relevant data. The speed at which this
occurs, however, is not acceptable. 2800 objects take 11 minutes to parse
and index into Solr.
The big slowdown appears to be that I'm parsing the data with an XML
parser.
So, now I'm testing mining the data by opening the file as just a text
file (using Groovy) and picking out relevant data using regular
expression matching. I'm now able to parse (mine) the data and index the
2800 files in 72 seconds.
So I'm wondering if the typical solution people use is to go with a
non-XML solution. It seems to make sense considering the search index
would only want to store (as much data) as possible and not rely on the
incoming documents being xml compliant.
Thanks in advance for any thoughts on this!
-Kristian
