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https://issues.apache.org/jira/browse/SOLR-9638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044856#comment-16044856
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Jan Høydahl commented on SOLR-9638:
-----------------------------------
Backup / Restore only works for a shared file system. Is {{/var/solr}} a nfs
mountpoint on your server? If not, the Overseer node creates the backup folder,
and then each shard just tries to write to it assuming it is there (it should
be). But on a non-shared FS the folder will not be there on the other nodes of
course.
> SolrCloud restore of backup fails
> ---------------------------------
>
> Key: SOLR-9638
> URL: https://issues.apache.org/jira/browse/SOLR-9638
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Håvar Nøvik
> Priority: Minor
> Labels: SolrCloud
>
> Steps to reproduce:
> * create backup with the following api call:
> /admin/collections?action=BACKUP&name=myBackupName&collection=myCollectionName&location=/path/to/my/shared/drive
> * restore to from backup with the following api call:
> /admin/collections?action=RESTORE&name=myBackupName&location=/path/to/my/shared/drive&collection=myRestoredCollectionName
> Expected result:
> * a new collection with the data from the 'myCollectionName' collection is
> created
> Actual result:
> * the api call fails with a 500 http status code and the following stacktrace:
> {code}
> org.apache.solr.common.SolrException: Couldn't restore since doesn't exist:
> file:///path/to/my/shared/drive/myBackupName
> at
> org.apache.solr.handler.admin.CollectionsHandler.handleResponse(CollectionsHandler.java:284)
> at
> org.apache.solr.handler.admin.CollectionsHandler.handleRequestBody(CollectionsHandler.java:215)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:154)
> at
> org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:658)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:440)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:257)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:208)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
> at
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
> at org.eclipse.jetty.server.Server.handle(Server.java:518)
> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)
> at
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244)
> at
> org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
> at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
> at
> org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
> at
> org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246)
> at
> org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> More info:
> It seems like a bug in the [LocalFileSystemRepository |
> https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/core/backup/repository/LocalFileSystemRepository.java#L114]
> where it checks if the backup exists. The bug is that it check if a file
> with that name exists, but the BACKUP command creates a directory.
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