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https://issues.apache.org/jira/browse/SOLR-15371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17363163#comment-17363163
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Roy Perkins commented on SOLR-15371:
------------------------------------
Like I said, it can be hard to reproduce. It seems like it happens when the
host I run the backup from is the leader for the shard of the collection that
fails. Below is some output from my backup script:
{code:java}
{ "responseHeader":{ "status":0, "QTime":0}, "success":{
"solrmulti03.DOM.DOMAIN.com:8983_solr":{ "responseHeader":{ "status":0,
"QTime":0}}, "solrmulti08.DOM.DOMAIN.com:8983_solr":{ "responseHeader":{
"status":0, "QTime":0}}, "solrmulti01.DOM.DOMAIN.com:8983_solr":{
"responseHeader":{ "status":0, "QTime":4}},
"solrmulti04.DOM.DOMAIN.com:8983_solr":{ "responseHeader":{ "status":0,
"QTime":14}}, "solrmulti04.DOM.DOMAIN.com:8983_solr":{ "responseHeader":{
"status":0, "QTime":0}, "STATUS":"completed", "Response":"TaskId:
100034112630053395656 webapp=null path=/admin/cores
params={core=search_shard2_replica_n4&async=100034112630053395656&qt=/admin/cores&name=shard2&action=BACKUPCORE&location=file:///mnt/solr_backups/search/search-06-14-2021&wt=javabin&version=2}
status=0 QTime=14"}, "solrmulti03.DOM.DOMAIN.com:8983_solr":{
"responseHeader":{ "status":0, "QTime":0}, "STATUS":"completed",
"Response":"TaskId: 100034112630053446666 webapp=null path=/admin/cores
params={core=search_shard3_replica_n29&async=100034112630053446666&qt=/admin/cores&name=shard3&action=BACKUPCORE&location=file:///mnt/solr_backups/search/search-06-14-2021&wt=javabin&version=2}
status=0 QTime=0"}, "solrmulti08.DOM.DOMAIN.com:8983_solr":{
"responseHeader":{ "status":0, "QTime":0}, "STATUS":"completed",
"Response":"TaskId: 100034112630053465731 webapp=null path=/admin/cores
params={core=search_shard4_replica_n23&async=100034112630053465731&qt=/admin/cores&name=shard4&action=BACKUPCORE&location=file:///mnt/solr_backups/search/search-06-14-2021&wt=javabin&version=2}
status=0 QTime=0"}}, "100034112630053395656":{ "responseHeader":{ "status":0,
"QTime":0}, "STATUS":"completed", "Response":"TaskId: 100034112630053395656
webapp=null path=/admin/cores
params={core=search_shard2_replica_n4&async=100034112630053395656&qt=/admin/cores&name=shard2&action=BACKUPCORE&location=file:///mnt/solr_backups/search/search-06-14-2021&wt=javabin&version=2}
status=0 QTime=14"}, "100034112630053446666":{ "responseHeader":{ "status":0,
"QTime":0}, "STATUS":"completed", "Response":"TaskId: 100034112630053446666
webapp=null path=/admin/cores
params={core=search_shard3_replica_n29&async=100034112630053446666&qt=/admin/cores&name=shard3&action=BACKUPCORE&location=file:///mnt/solr_backups/search/search-06-14-2021&wt=javabin&version=2}
status=0 QTime=0"}, "100034112630053465731":{ "responseHeader":{ "status":0,
"QTime":0}, "STATUS":"completed", "Response":"TaskId: 100034112630053465731
webapp=null path=/admin/cores
params={core=search_shard4_replica_n23&async=100034112630053465731&qt=/admin/cores&name=shard4&action=BACKUPCORE&location=file:///mnt/solr_backups/search/search-06-14-2021&wt=javabin&version=2}
status=0 QTime=0"}, "100034112630053492379":{ "responseHeader":{ "status":0,
"QTime":0}, "STATUS":"failed", "Response":"Failed to backup
core=search_shard1_replica_n25 because org.apache.solr.common.SolrException:
Directory to contain snapshots doesn't exist:
file:///mnt/solr_backups/search/search-06-14-2021. Note that Backup/Restore of
a SolrCloud collection requires a shared file system mounted at the same path
on all nodes!"}, "failure":{ "solrmulti01.DOM.DOMAIN.com:8983_solr":{
"responseHeader":{ "status":0, "QTime":0}, "STATUS":"failed",
"Response":"Failed to backup core=search_shard1_replica_n25 because
org.apache.solr.common.SolrException: Directory to contain snapshots doesn't
exist: file:///mnt/solr_backups/search/search-06-14-2021. Note that
Backup/Restore of a SolrCloud collection requires a shared file system mounted
at the same path on all nodes!"}}, "status":{ "state":"failed", "msg":"found
[1000] in failed tasks"}}
{code}
> Backups randomly fail sometimes
> -------------------------------
>
> Key: SOLR-15371
> URL: https://issues.apache.org/jira/browse/SOLR-15371
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Backup/Restore
> Affects Versions: 8.5.2, 8.8.2
> Reporter: Roy Perkins
> Priority: Major
>
> Hi, we have an issue where sometimes one shard fails to backup due to what
> might be a race condition in creating the folder/starting the backup. When
> this happens, we have to restart the first server in a shard to get the
> backup to succeed again. The cluster backs up to a shared NFS mount. 4/5
> times the backup goes fine without issues (there is even another collection
> that the backup will run for later in the morning that will succeed fine even
> though it's all the same servers) Below is the error I get.
> {code:java}
> "Response":"Failed to backup core=slprod_shard4_replica_n6 because
> org.apache.solr.common.SolrException: Directory to contain snapshots doesn't
> exist: file:///mnt/solr_backups/slprod/slprod-04-25-2021. Note that
> Backup/Restore of a SolrCloud collection requires a shared file system
> mounted at the same path on all nodes!"},
> {code}
> And below is the line I use to backup with (obviously with bash variables set
> earlier in the script)
> {code:java}
> curl -s
> "http://localhost:8983/solr/admin/collections?action=BACKUP&name=${COLLECTION}-${DATE}&collection=${COLLECTION}&location=${BACKUP_PATH}&async=1000";
> {code}
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