Varun Thacker commented on SOLR-12088:

Hi Jerry,

So if I was to put it in another way if this was the scenario then shard2's 
write latency will be higher? 

shard1 : has 3 "active" replicas

shard2 : has 3 "active" replicas and 3 replicas in "down" state 

Can you tell me a few things about the cluster:

1. How many nodes are there in the cluster

2. Of the N nodes are there nodes that are part of the cluster but not hosting 
any replica of any shard on nodes 

3. Are you indexing via a SolrJ based client ? 

4. How are you measuring the latency? JMX ?

> Shards with dead replicas cause increased write latency
> -------------------------------------------------------
>                 Key: SOLR-12088
>                 URL: https://issues.apache.org/jira/browse/SOLR-12088
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>    Affects Versions: 7.2
>            Reporter: Jerry Bao
>            Priority: Major
> If a collection's shard contains dead replicas, write latency to the 
> collection is increased. For example, if a collection has 10 shards with a 
> replication factor of 3, and one of those shards contains 3 replicas and 3 
> downed replicas, write latency is increased in comparison to a shard that 
> contains only 3 replicas.
> My feeling here is that downed replicas should be completely ignored and not 
> cause issues to other alive replicas in terms of write latency.

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