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https://issues.apache.org/jira/browse/SOLR-4260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13874311#comment-13874311
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Mark Miller commented on SOLR-4260:
-----------------------------------

bq. The conditions in this statement have changed and I think made it possible 
for the null pointer to appear.

Ah, nice - thanks. I had already made some changes so couldn't line up the src 
lines - thought you meant the line that was the culprit was the one that the 
NPE came from.

I'll take a closer look.

> Inconsistent numDocs between leader and replica
> -----------------------------------------------
>
>                 Key: SOLR-4260
>                 URL: https://issues.apache.org/jira/browse/SOLR-4260
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>         Environment: 5.0.0.2013.01.04.15.31.51
>            Reporter: Markus Jelsma
>            Assignee: Mark Miller
>            Priority: Critical
>             Fix For: 5.0, 4.7, 4.6.1
>
>         Attachments: 192.168.20.102-replica1.png, 
> 192.168.20.104-replica2.png, SOLR-4260.patch, clusterstate.png, 
> demo_shard1_replicas_out_of_sync.tgz
>
>
> After wiping all cores and reindexing some 3.3 million docs from Nutch using 
> CloudSolrServer we see inconsistencies between the leader and replica for 
> some shards.
> Each core hold about 3.3k documents. For some reason 5 out of 10 shards have 
> a small deviation in then number of documents. The leader and slave deviate 
> for roughly 10-20 documents, not more.
> Results hopping ranks in the result set for identical queries got my 
> attention, there were small IDF differences for exactly the same record 
> causing a record to shift positions in the result set. During those tests no 
> records were indexed. Consecutive catch all queries also return different 
> number of numDocs.
> We're running a 10 node test cluster with 10 shards and a replication factor 
> of two and frequently reindex using a fresh build from trunk. I've not seen 
> this issue for quite some time until a few days ago.



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