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

["Mark Payne (Jira)" <ji...@apache.org>]

Mark Payne created NIFI-8210:
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             Summary: 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


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: []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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