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https://issues.apache.org/jira/browse/SOLR-5946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13957257#comment-13957257
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Maxim Novikov commented on SOLR-5946:
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Please describe also the strategy for restoring backups, specifically for
SorlCloud. From your documentation it is still possible to grasp the idea how
to back up the index using HTTP commands, but it is absolutely unclear what to
do with those backups if the cluster goes down one day for some reason. So far
those are just a bunch of files/directories no one knows how to use.
Would we need to delete the directory with the current index?
Should we copy one of the snapshot directories files to the index directory?
Would we have to do something with transaction logs (delete, modify, etc.)?
How to let the other nodes in the cluster know that the index has been restored
from an earlier version and trigger the synchronization process?
Also, it does not seem to be explained anywhere, but it looks like fetching
data (triggering that process via HTTP) from master to slave does not work in
SolrCloud as all the nodes are considered to me masters.
I believe all these questions (and the others related) should be addressed as
for now SolrCloud is not being a comprehensive solution because you need to
work around some similar stuff on your own. And it is not really reliable if
Solr cannot handle such things at all.
PS My understanding is that currently backups are useless as you cannot do
anything with them (at least I have not found any info that would cover that).
They may help only in case of complete horrible failure when all the nodes in
the cluster got exploded and then you want to restore the index quickly on
other ones avoiding the full import from the data source from scratch. But this
is really not a real-life use case. The more typical would be "I want to
restore my data after I occasionally cleaned up the index in SolrCloud" or "I
want to restore my data from a backed up snapshot when the index got corrupted
for some reason", etc.
> Need clear docs on how to "backup" and "restore" indexes
> --------------------------------------------------------
>
> Key: SOLR-5946
> URL: https://issues.apache.org/jira/browse/SOLR-5946
> Project: Solr
> Issue Type: Bug
> Reporter: Hoss Man
>
> As pointed out by Maxim Novikov in the comments of the Solr Ref Guide: the
> instructions on creating index backups are very sparse, and give no clear
> instructions on how to _restore_ fro ma backup.
> This page really needs to be beefed up with more complete instructions...
> https://cwiki.apache.org/confluence/display/solr/Backing+Up
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