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https://issues.apache.org/jira/browse/SOLR-12088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398092#comment-16398092
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Varun Thacker commented on SOLR-12088:
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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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