Leon,
Index is typically a directory on disk with files (commonly called "index
files") in it.
Each index can have 1 or more segments.
Each segment is comprised of several index files.
If you are using the compound index format, then the situation is a bit
different (less index files).
Otis
P.S.
You asked about Lucene in Action... :)
----- Original Message ----
From: Chris Hostetter <[EMAIL PROTECTED]>
To: java-user@lucene.apache.org
Sent: Wednesday, February 15, 2006 1:40:01 PM
Subject: Re: Size + memory restrictions
: We may have many different segments of our index, and it seems below we are
: using one
: IndexSearcher per segment. Could this explain why we run out of memory when
: using more than 2/3 segments?
: Anyone else have any comments on the below?
terminology is a big issue hwere .. when you use the word "segment" it
seems like you are talking about a segment of your data, which is in a
self contained index in it's own right. My point in in the comment you
quoted was that for a given index, you don't need more then one active
IndexSearcher open at a time, any more then that can waste resources.
I don't know what kind of memory overhead there is in a MultiSearcher, but
besides that you should also be looking at the other issues in the message
you quoted from: who/when is calling your getSearcher() method? ... is
it getting called more often then the underlying indexes change? who is
closing the old searchers when you open new ones?
:
: Many thanks
:
: Leon
: ps. At the moment I think it is set to only look at 2 segements
:
: private Searcher getSearcher() throws IOException {
: if (mSearcher == null) {
: synchronized (Monitor) {
: Searcher[] srs = new IndexSearcher[SearchersDir.size()];
: int maxI = 2;
: // Searcher[] srs = new IndexSearcher[maxI];
: int i = 0;
: for (Iterator iter = SearchersDir.iterator(); iter.hasNext() && i<maxI;
: i++) {
: String dir = (String) iter.next();
: try {
: srs[i] = new IndexSearcher(IndexDir+dir);
: } catch (IOException e) {
: log.error(ClassTool.getClassNameOnly(e) + ": " + e.getMessage(), e);
: }
: }
: mSearcher = new MultiSearcher(srs);
: changeTime = System.currentTimeMillis();
: }
: }
: return mSearcher;
: }
: ----- Original Message -----
: From: "Leon Chaddock" <[EMAIL PROTECTED]>
: To: <java-user@lucene.apache.org>
: Sent: Wednesday, February 15, 2006 9:28 AM
: Subject: Re: Size + memory restrictions
:
:
: > Hi Greg,
: > Thanks. We are actually running against 4 segments of 4gb so about 20
: > million docs. We cant merge the segments as their seems to be problems
: > with out linux box , with having files over about 4gb. Not sure why that
: > is.
: >
: > If I was to upgrade to 8gb of ram does it seem likely this will double the
: > amount of docs we can handle, or would this provide an exponential
: > increase?
: >
: > Thanks
: >
: > Leon
: > ----- Original Message -----
: > From: "Greg Gershman" <[EMAIL PROTECTED]>
: > To: <java-user@lucene.apache.org>
: > Sent: Wednesday, February 15, 2006 12:41 AM
: > Subject: Re: Size + memory restrictions
: >
: >
: >> You may consider incrementally adding documents to
: >> your index; I'm not sure why there would be problems
: >> adding to an existing index, but you can always add
: >> additional documents. You can optimize later to get
: >> everything back into a single segment.
: >>
: >> Querying is a different story; if you are using the
: >> Sort API, you will need enough memory to store a full
: >> sorting of your documents in memory. If you're trying
: >> to sort on a string or anything other than an int or
: >> float, this could require a lot of memory.
: >>
: >> I've used indices much bigger than 5 mil. docs/3.5 gb
: >> with less than 4GB of RAM and had no problems.
: >>
: >> Greg
: >>
: >>
: >> --- Leon Chaddock <[EMAIL PROTECTED]> wrote:
: >>
: >>> Hi,
: >>> we are having tremendous problems building a large
: >>> lucene index and querying
: >>> it.
: >>>
: >>> The programmers are telling me that when the index
: >>> file reaches 3.5 gb or 5
: >>> million docs the index file can no longer grow any
: >>> larger.
: >>>
: >>> To rectify this they have built index files in
: >>> multiple directories. Now
: >>> apparently my 4gb memory is not enough to query.
: >>>
: >>> Does this seem right to people or does anyone have
: >>> any experience on largish
: >>> scale projects.
: >>>
: >>> I am completely tearing my hair out here and dont
: >>> know what to do.
: >>>
: >>> Thanks
: >>>
: >>
: >>
: >> __________________________________________________
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-Hoss
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