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https://issues.apache.org/jira/browse/SOLR-12523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16525628#comment-16525628
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Jan Høydahl commented on SOLR-12523:
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Yes, you need a shared file system with the same file path across nodes. The
error messages is not very helpful.
The reference Guide at
[https://lucene.apache.org/solr/guide/7_4/collections-api.html#backup] says:
{quote}Backs up Solr collections and associated configurations to a shared
filesystem - for example a Network File System.
{quote}
We should probably add a CAUTION box in the refGuide for the shared fs
requirement. We should also improve the error messages. Perhaps the
{{BackupCmd}} could do a pre-check before starting the backup by writing a file
with random file name into the backup root folder and then ask each node to
check for the existence of that file - if it fails we'd abort the backup with
some sane error message.
> Collection backup fails whether the location + name directory exists or not
> exists.
> -----------------------------------------------------------------------------------
>
> Key: SOLR-12523
> URL: https://issues.apache.org/jira/browse/SOLR-12523
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Backup/Restore
> Affects Versions: 7.3.1
> Reporter: Timothy Potter
> Priority: Major
>
> So I have a large collection with 4 shards across 2 nodes. When I try to back
> it up with:
> {code}
> curl
> "http://localhost:8984/solr/admin/collections?action=BACKUP&name=sigs&collection=foo_signals&async=5&location=backups";
> {code}
> I either get:
> {code}
> "5170256188349065":{
> "responseHeader":{
> "status":0,
> "QTime":0},
> "STATUS":"failed",
> "Response":"Failed to backup core=foo_signals_shard1_replica_n2 because
> org.apache.solr.common.SolrException: Directory to contain snapshots doesn't
> exist: file:///vol1/cloud84/backups/sigs"},
> "5170256187999044":{
> "responseHeader":{
> "status":0,
> "QTime":0},
> "STATUS":"failed",
> "Response":"Failed to backup core=foo_signals_shard3_replica_n10 because
> org.apache.solr.common.SolrException: Directory to contain snapshots doesn't
> exist: file:///vol1/cloud84/backups/sigs"},
> {code}
> or if I create the directory, then I get:
> {code}
> {
> "responseHeader":{
> "status":0,
> "QTime":2},
> "Operation backup caused
> exception:":"org.apache.solr.common.SolrException:org.apache.solr.common.SolrException:
> The backup directory already exists: file:///vol1/cloud84/backups/sigs/",
> "exception":{
> "msg":"The backup directory already exists:
> file:///vol1/cloud84/backups/sigs/",
> "rspCode":400},
> "status":{
> "state":"failed",
> "msg":"found [2] in failed tasks"}}
> {code}
> I'm thinking this has to do with having 2 cores from the same collection on
> the same node but I can't get a collection with 1 shard on each node to work
> either:
> {code}
> "ec2-52-90-245-38.compute-1.amazonaws.com:8984_solr":"org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException:Error
> from server at http://ec2-52-90-245-38.compute-1.amazonaws.com:8984/solr:
> Failed to backup core=system_jobs_history_shard2_replica_n6 because
> org.apache.solr.common.SolrException: Directory to contain snapshots doesn't
> exist: file:///vol1/cloud84/backups/ugh1"}
> {code}
> What's weird is that replica (system_jobs_history_shard2_replica_n6) is not
> even on the ec2-52-90-245-38.compute-1.amazonaws.com node! It lives on a
> different node.
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