Alexander S. created SOLR-12363:
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Summary: Duplicates with random search, cursors, and fixed seed
Key: SOLR-12363
URL: https://issues.apache.org/jira/browse/SOLR-12363
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 5.3.1
Reporter: Alexander S.
Attachments: Screen shot 2018-05-16 at 14.51.19.png, Screen shot
2018-05-16 at 14.51.23.png, Screen shot 2018-05-16 at 14.51.26.png
We do have a SolrCloud cluster and just updated one of our views to use cursors
with the random order. Our goal was to use an infinite scroll with the random
ordering so we can shuffle results once every 24 hours.
To do so we save the seed that we use in our random order to the cookies with
the 24 hours expiration period, which didn't work as expected:
# Results are shuffled with every request (every time we pass the initial
cursor value "*" and the same random value for ordering we already used).
# Results contain duplicates sometimes. Not a lot of them, but from time to
time they appear.
In our *schema.xml* we have:
{code:java}
<fieldType name="rand" class="solr.RandomSortField" omitNorms="true"/>
<dynamicField name="random_*" stored="false" type="rand" multiValued="false"
indexed="true"/>{code}
In our search requests, we order by *random_123 asc, id asc*, where *123* is
the seed from cookies.
Here is the page [https://awards.wegohealth.com/nominees]
Even when I try to get the "next page" URL from google chrome developer console
and open it in separate tabs it yields different results:
[https://awards.wegohealth.com/nominees?cursor=AoJYmYbyATRBd2FyZDo6Tm9taW5lZSAxMzI0Mg%3D%3D]
So it feels like the seed parameter we use is ignored or every shard
understands it differently, not sure.
On the screenshots, you can see the URL is the same and results are different.
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