Maxim Novikov created SOLR-5821:
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Summary: Search inconsistency on SolrCloud replicas
Key: SOLR-5821
URL: https://issues.apache.org/jira/browse/SOLR-5821
Project: Solr
Issue Type: Bug
Components: SolrCloud
Affects Versions: 4.6.1
Environment: CentOS 6.5, Tomcat 8.0.3, Solr 4.6.1
1 shard, 2 replicas (servers with identical hardware/software)
Reporter: Maxim Novikov
Priority: Critical
We use the following infrastructure:
SolrCloud with 1 shard and 2 replicas. The index is built using
DataImportHandler (importing data from the database). The number of items in
the index can vary from 100 to 100,000,000.
After indexing part of the data (not necessarily all the data, it is enough to
have a small number of items in the search index), we can observe that Solr
instances (replicas) return different results for the same search queries. I
believe it happens because some of the results have the same scores, and Solr
instances return those in a random order.
PS This is a critical issue for us as we use a load balancer to scale Solr
through replicas, and as a result of this issue, we retrieve various results
for the same queries all the time. They are not necessarily completely
different, but even a couple of items that differ is a deal breaker.
The expected behaviour would be to always get identical results for the same
search queries from all replicas. Otherwise, this "cloud" thing works just
unreliably.
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