Ansgar Wiechers created SOLR-11823:
--------------------------------------
Summary: Incorrect number of replica calculation when using
Restore Collection API
Key: SOLR-11823
URL: https://issues.apache.org/jira/browse/SOLR-11823
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: Backup/Restore
Affects Versions: 7.1
Reporter: Ansgar Wiechers
I'm running Solr 7.1 (didn't test other versions) in SolrCloud mode ona a
3-node cluster and tried using the backup/restore API for the first time.
Backup worked fine, but when trying to restore the backed-up collection I ran
into an unexpected problem with the replication factor setting.
I expected the command below to restore a backup of the collection "demo" with
3 shards, creating 2 replicas per shard. Instead it's trying to create 6
replicas per shard:
{noformat}
# curl -s -k
'https://localhost:8983/solr/admin/collections?action=restore&name=demo&location=/srv/backup/solr/solr-dev&collection=demo&maxShardsPerNode=2&replicationFactor=2'
{
"error": {
"code": 400,
"msg": "Solr cloud with available number of nodes:3 is insufficient for
restoring a collection with 3 shards, total replicas per shard 6 and
maxShardsPerNode 2. Consider increasing maxShardsPerNode value OR number
ofavailable nodes.",
"metadata": [
"error-class",
"org.apache.solr.common.SolrException",
"root-error-class",
"org.apache.solr.common.SolrException"
]
},
"exception": {
"rspCode": 400,
"msg": "Solr cloud with available number of nodes:3 is insufficient for
restoring a collection with 3 shards, total replicas per shard 6 and
maxShardsPerNode 2. Consider increasing maxShardsPerNode value OR number of
available nodes."
},
"Operation restore caused exception:":
"org.apache.solr.common.SolrException:org.apache.solr.common.SolrException:
Solr cloud with available number of nodes:3 is insufficient for restoring a
collection with 3 shards, total replicas per shard 6 and maxShardsPerNode 2.
Consider increasing maxShardsPerNode value OR number of available nodes.",
"responseHeader": {
"QTime": 28,
"status": 400
}
}
{noformat}
Restoring a collection with only 2 shards tries to create 6 replicas as well,
so it looks to me like the restore API multiplies the replication factor with
the number of nodes, which is not how the replication factor behaves in other
contexts. The
[documentation|https://lucene.apache.org/solr/guide/7_1/collections-api.html]
also didn't lead me to expect this behavior:
{quote}
replicationFactor
The number of replicas to be created for each shard.
{quote}
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