[jira] [Commented] (NIFI-8210) If Provenance Repository ages off a Lucene Index while it's being searched, can lead to index corruption

["Joe Witt (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-8210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17281451#comment-17281451 ] 

Joe Witt commented on NIFI-8210:
--------------------------------

good one to pull into 1.13 RC4 since RC3 sank.

> If Provenance Repository ages off a Lucene Index while it's being searched, can lead to index corruption
> --------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-8210
>                 URL: https://issues.apache.org/jira/browse/NIFI-8210
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>            Priority: Major
>             Fix For: 1.13.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When all events have been aged off from a Provenance Lucene Index, the lucene index can be deleted. However, before deleting it, the repository needs to ensure that there are no active readers or writers. Currently, the repository only ensures that there are no active writers. As a result, we can have an active Index Reader/Index Searcher and still delete the index directory. When this happens, we end up with an error similar to:
> {code:java}
> org.apache.lucene.index.IndexNotFoundException: no segments* file found in MMapDirectory@/Users/mpayne/devel/nifi/nifi-nar-bundles/nifi-provenance-repository-bundle/nifi-persistent-provenance-repository/target/6e442c6d-14f3-48bb-9500-534c136942aa lockFactory=org.apache.lucene.store.NativeFSLockFactory@161b062a: files: []
> 	at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:675)
> 	at org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:81)
> 	at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:63)
> 	at org.apache.nifi.provenance.lucene.StandardIndexManager.borrowIndexSearcher(StandardIndexManager.java:128)
> ...{code}
> We need to ensure that we account for any Readers/Searchers that are active also



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