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https://issues.apache.org/jira/browse/SOLR-13872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16973470#comment-16973470
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ASF subversion and git services commented on SOLR-13872:
--------------------------------------------------------
Commit 30e55e2b6efc55c04761b80c22a106f4a1115722 in lucene-solr's branch
refs/heads/master from Chris M. Hostetter
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=30e55e2 ]
SOLR-13872: Fixed Backup failures due to race conditions in saving/reserving
commit points
> Backup can fail to read index files w/NoSuchFileException during merges
> (SOLR-11616 regression)
> ------------------------------------------------------------------------------------------------
>
> Key: SOLR-13872
> URL: https://issues.apache.org/jira/browse/SOLR-13872
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Chris M. Hostetter
> Assignee: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-13872.patch, SOLR-13872.patch, SOLR-13872.patch,
> SOLR-13872.patch, index_churn.pl
>
>
> SOLR-11616 purports to fix a bug in Solr's backup functionality that causes
> 'NoSuchFileException' errors when attempting to backup an index while it is
> undergoing indexing (and segment merging)
> Although SOLR-11616 is marked with "Fix Version: 7.2" it's pretty easy to
> demonstrate that this bug still exists on master, branch_8x, and even in 7.2
> - so it seems less like the current problem is a "regression" and more that
> the original fix didn't work.
> ----
> The crux of the problem seems to be concurrency bugs in if/how a commit is
> "reserved" before attempting to copy the files in that commit to the backup
> location.
> A possible work around discussed in more depth in the comments below is to
> update {{solrconfig.xml}} to explicitly configure the {{SolrDeletionPolicy}}
> with either the {{maxCommitsToKeep}} or {{maxCommitAge}} options to ensure
> the commits are kept around long enough for the backup to be created.
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