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Posted to issues@lucene.apache.org by "David Smiley (Jira)" <ji...@apache.org> on 2019/12/05 20:00:00 UTC
[jira] [Commented] (SOLR-13872) Backup can fail to read index
files w/NoSuchFileException during merges (SOLR-11616 regression)
[ https://issues.apache.org/jira/browse/SOLR-13872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16989113#comment-16989113 ]
David Smiley commented on SOLR-13872:
-------------------------------------
This is a really impressive investigation Hoss; I am in awe!
> 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
> Fix For: master (9.0), 8.4
>
> 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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