[jira] [Commented] (SOLR-5821) Search inconsistency on SolrCloud replicas

["Maxim Novikov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-5821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13924107#comment-13924107 ] 

Maxim Novikov commented on SOLR-5821:
-------------------------------------

Will this additional ordering not impact the performance of search? Considering 100,000,000 records indexed from the database, and having about 400 search requests per second per 1 Solr instance.

> 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: SolrCloud:
> 1 shard, 2 replicas
> Both instances/replicas have identical hardware/software:
> CPU(s): 4
> RAM: 8Gb
> HDD: 100Gb
> OS: CentOS 6.5
> ZooKeeper 3.4.5
> Tomcat 8.0.3
> Solr 4.6.1
> Servers are utilized to run Solr only.
>            Reporter: Maxim Novikov
>            Priority: Critical
>              Labels: cloud, inconsistency, replica, search
>
> 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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