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https://issues.apache.org/jira/browse/SOLR-11676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16307025#comment-16307025
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Varun Thacker commented on SOLR-11676:
--------------------------------------
I ran into this while doing a simple restore.
Steps to reproduce:
1. ./bin/solr start -e cloud -noprompt : This creates a 2 node cluster and a
gettingstarted collection which 2X2
2. Added 4 docs (id=1,2,3,4) with commit=true and openSearcher=true (default)
3. Call backup:
http://localhost:8983/solr/admin/collections?action=BACKUP&name=gettingstarted_backup&collection=gettingstarted&location=/Users/varunthacker/solr-7.1.0
4. Call restore:
http://localhost:8983/solr/admin/collections?action=restore&name=gettingstarted_backup&collection=restore_gettingstarted&location=/Users/varunthacker/solr-7.1.0
At step 4, you'll get an error saying {{Solr cloud with available number of
nodes:2 is insufficient for restoring a collection with 2 shards, total
replicas per shard 1 and maxShardsPerNode -1. Consider increasing
maxShardsPerNode value OR number of available nodes.}}
The restore test doesn't catch this because in the test we always explicitly
specify maxShardsPerNode (
https://github.com/apache/lucene-solr/blob/master/solr/core/src/test/org/apache/solr/cloud/AbstractCloudBackupRestoreTestCase.java#L256
)
When I look at the state.json of gettingstarted it has
{code}
{"gettingstarted":{
"pullReplicas":"0",
"replicationFactor":"2",
"router":{"name":"compositeId"},
"maxShardsPerNode":"-1",
"autoAddReplicas":"false",
"nrtReplicas":"1",
"tlogReplicas":"0",
"shards":{
...
{code}
I think there are two problems here :
a> nrtReplicas should be 2
b> maxShardsPerNode should be 2
> nrt replicas is always 1 when not specified
> -------------------------------------------
>
> Key: SOLR-11676
> URL: https://issues.apache.org/jira/browse/SOLR-11676
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Varun Thacker
> Attachments: SOLR-11676.patch
>
>
> I created 1 2 shard X 2 replica collection . Here's the log entry for it
> {code}
> 2017-11-27 06:43:47.071 INFO (qtp159259014-22) [ ]
> o.a.s.h.a.CollectionsHandler Invoked Collection Action :create with params
> replicationFactor=2&routerName=compositeId&collection.configName=_default&maxShardsPerNode=2&name=test_recovery&router.name=compositeId&action=CREATE&numShards=2&wt=json&_=1511764995711
> and sendToOCPQueue=true
> {code}
> And then when I look at the state.json file I see nrtReplicas is set to 1.
> Any combination of numShards and replicationFactor without explicitly
> specifying the "nrtReplicas" param puts the "nrtReplicas" as 1 instead of
> using the replicationFactor value
> {code}
> {"test_recovery":{
> "pullReplicas":"0",
> "replicationFactor":"2",
> ...
> "nrtReplicas":"1",
> "tlogReplicas":"0",
> ..
> {code}
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