Erick
Yes, we see documents changing their position in the list due to having
deleted docs.
In our searchresult,weapply higher boost (bq) to a group of matched
documents to have them display at the top tier of the result.
At times 1 or 2 of these documentsare not return in the top tier, they
are relegateddown to the lower tierof the result. Wediscovered that
these documents have a lower score due to docFreq=2.
After we do an optimize, these 1-2 documents are back in the top tier
result order and their docFreqis 1.
On 9/1/2015 11:40 PM, Erick Erickson wrote:
Derek:
Why do you care? What evidence do you have that this matters _practically_?
If you've look at scoring with a small number of documents, you'll see
significant
differences due to deleted documents. In most cases, as you get a larger number
of documents the ranking of documents in an index with no deletions .vs. indexes
that have deletions is usually not noticeable.
I'm suggesting that this is a red herring. Your specific situation may
be different
of course, but since scoring is really only about ranking docs
relative to each other,
unless the relative positions change enough to be noticeable it's not a problem.
Note that I'm saying "relative rankings", NOT "absolute score". Document scores
have no meaning outside comparisons to other docs _in the same query_. So
unless you see documents changing their position in the list due to
having deleted
docs, it's not worth spending time on IMO.
Best,
Erick
On Tue, Sep 1, 2015 at 12:45 AM, Upayavira <u...@odoko.co.uk> wrote:
I wonder if this resolves it [1]. It has been applied to trunk, but not
to the 5.x release branch.
If you needed it in 5.x, I wonder if there's a way that particular
choice could be made configurable.
Upayavira
[1] https://issues.apache.org/jira/browse/LUCENE-6711
On Tue, Sep 1, 2015, at 02:43 AM, Derek Poh wrote:
Hi Upayavira
In fact we are using optimize currently but was advised to use expunge
deletes as it is less resource intensive.
So expunge deletes will only remove deleted documents, it will not merge
all index segments into one?
If we don't use optimize, the deleted documents in the index will affect
the scores (with docFreq=2) of the matched documents which will affect
the relevancy of the search result.
Derek
On 9/1/2015 12:05 AM, Upayavira wrote:
If you really must expunge deletes, use optimize. That will merge all
index segments into one, and in the process will remove any deleted
documents.
Why do you need to expunge deleted documents anyway? It is generally
done in the background for you, so you shouldn't need to worry about it.
Upayavira
On Mon, Aug 31, 2015, at 06:46 AM, davidphilip cherian wrote:
Hi,
The below curl command worked without error, you can try.
curl http://localhost:8983/solr/techproducts/update?commit=true -H
"Content-Type: text/xml" --data-binary '<commit waitSearcher="false"
expungeDeletes="true"/>'
However, after executing this, I could still see same deleted counts on
dashboard. Deleted Docs:6
I am not sure whether that means, the command did not take effect or it
took effect but did not reflect on dashboard view.
On Mon, Aug 31, 2015 at 8:51 AM, Derek Poh <d...@globalsources.com>
wrote:
Hi
I tried doing a expungeDeletes=true with the following but get the message
'missing content stream'. What am I missing? I need to provide additional
parameters?
curl 'http://127.0.0.1:8983/solr/supplier/update/json?expungeDeletes=true
';
Thanks,
Derek
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