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https://issues.apache.org/jira/browse/SOLR-12085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karishma Agrawal updated SOLR-12085:
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Affects Version/s: 7.1
7.2
> IndexFetcher does not honor SolrDeletionPolicy
> ----------------------------------------------
>
> Key: SOLR-12085
> URL: https://issues.apache.org/jira/browse/SOLR-12085
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: replication (java)
> Affects Versions: 5.4.1, 7.1, 7.2
> Reporter: Karishma Agrawal
> Priority: Major
>
> Index Fetcher is not in sync with Solr Deletion Policy.
> If we set the SolrDeletionPolicy to retain more than 1 commit - i.e.
> maxCommitsToKeep > 1. Then slaves get stuck in alternate full replication.
> This happens because within IndexFetcher, there is a check for unusedFiles -
> hasUnusedFile, which takes IndexDirectory and latest commit as parameters. If
> there are files unrelated to latest commit in the index dir then this method
> returns true, and SolrDeletionPolicy is invoked. However there are no pending
> files to delete according to the index deletion policy since that is aware of
> other valid commits, and no action is taken. Once all the retries are
> exhausted, index fetcher sets fullreplication to true.
> Possible solutions:
> # remove the check for hasUnusedFile completely. We invoke
> IndexWriter#deleteUnusedFiles and move on.
> # Add another method in IndexFileDeleter (Lucene) which returns number of
> pending deleted files. We can replace the IndexFetcher#hasUnusedFile method
> with this.
> # Keep track of unused files in IndexDeletionPolicyWrapper.
> A variation of this bug was previously noted in
> https://issues.apache.org/jira/browse/SOLR-9278
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