Ashish: Deleting and re-adding a replica is not a solution. Even if you did, that would then be identical only until you started indexing again, then the stats could skew a bit.
When you index to NRT replicas, the wall clock times that cause the commits to trigger will be different due to network delays. What happens essentially is that the doc gets indexed to the leader at time X but hits the replica Y milliseconds later. So on leader, the autocommit interval expires at time X+Z (Z being your autocommit interval) but X+Y+Z on the follower. However, some additional docs may have already been indexed on the leader but not yet on the follower when the autocommit trigger happens so the newly-closed segment on the leader can have docs that the newly-closed segment on the follower does not have. the point is that the termfreq does _not_ change when a document is deleted in some segment (and remember that an update is really a delete followed by an add). The data associated with deleted docs is not purged until segments are merged. Further, the decision about which segments to merge is influenced by how many documents are deleted in each. All of which means that the tf/idf statistics are different (slightly) and you either have to use destributed IDF or just live with it. You're saying that the document count of live documents is different, and that's more concerning. Is this true for brief intervals or is it true when there is _no_ indexing going on _and_ your autocommit interval is allowed to expire? In that case it's a different problem. However, if the condition is transitory and goes away if you stop indexing, then it's the same issue I outlined above; autocommit is happening at different wall-clock times. Best, Erick On Fri, Jan 4, 2019 at 11:12 AM Ashish Bisht <bishtashis...@gmail.com> wrote: > > Hi Erick, > > I have updated that I am not facing this problem in a new collection. > > As per 3) I can try deleting a replica and adding it again, but the > confusion is which one out of two should I delete.(wondering which replica > is giving correct score for query) > > Both replicas give same number of docs while doing all query.Its strange > that in query explain docCount and docFreq is differing. > > Regards > Ashish > > > > -- > Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
