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https://issues.apache.org/jira/browse/LUCENE-7662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861905#comment-15861905
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Michael McCandless commented on LUCENE-7662:
--------------------------------------------

Thanks [~mdrob]!

bq. That is frustrating. I ran it 10 times and somehow never hit that or a 
similar seed. 

The joys of randomized tests!  I'll review and push soon...

> Index with missing files should throw CorruptIndexException
> -----------------------------------------------------------
>
>                 Key: LUCENE-7662
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7662
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 6.4
>            Reporter: Mike Drob
>         Attachments: LUCENE-7662.patch, LUCENE-7662.patch, LUCENE-7662.patch
>
>
> Similar to what we did in LUCENE-7592 for EOF, we should catch missing files 
> and rethrow those as CorruptIndexException.
> If a particular codec can handle missing files, it should be proactive check 
> for those optional files and not throw anything, so I think we can safely do 
> this at SegmentReader or SegmentCoreReaders level.
> Stack trace copied from SOLR-10006:
> {noformat}
> Caused by: java.nio.file.NoSuchFileException: 
> /Users/Erick/apache/solrVersions/trunk/solr/example/cloud/node3/solr/eoe_shard1_replica1/data/index/_1_Lucene50_0.doc
>       at 
> sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
>       at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
>       at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
>       at 
> sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:177)
>       at java.nio.channels.FileChannel.open(FileChannel.java:287)
>       at java.nio.channels.FileChannel.open(FileChannel.java:335)
>       at 
> org.apache.lucene.store.MMapDirectory.openInput(MMapDirectory.java:238)
>       at 
> org.apache.lucene.store.NRTCachingDirectory.openInput(NRTCachingDirectory.java:192)
>       at 
> org.apache.solr.core.MetricsDirectoryFactory$MetricsDirectory.openInput(MetricsDirectoryFactory.java:334)
>       at 
> org.apache.lucene.codecs.lucene50.Lucene50PostingsReader.<init>(Lucene50PostingsReader.java:81)
>       at 
> org.apache.lucene.codecs.lucene50.Lucene50PostingsFormat.fieldsProducer(Lucene50PostingsFormat.java:442)
>       at 
> org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsReader.<init>(PerFieldPostingsFormat.java:292)
>       at 
> org.apache.lucene.codecs.perfield.PerFieldPostingsFormat.fieldsProducer(PerFieldPostingsFormat.java:372)
>       at 
> org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:109)
>       at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:74)
>       at 
> org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:143)
>       at 
> org.apache.lucene.index.ReadersAndUpdates.getReadOnlyClone(ReadersAndUpdates.java:195)
>       at 
> org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:103)
>       at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:473)
>       at 
> org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:103)
>       at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:79)
>       at 
> org.apache.solr.core.StandardIndexReaderFactory.newReader(StandardIndexReaderFactory.java:39)
>       at org.apache.solr.core.SolrCore.openNewSearcher(SolrCore.java:1958)
>       ... 12 more
> {noformat}



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