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https://issues.apache.org/jira/browse/LUCENE-8328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nhat Nguyen updated LUCENE-8328:
--------------------------------
Attachment: LUCENE-8328.patch
> ReadersAndUpdates#getLatestReader should execute under lock
> -----------------------------------------------------------
>
> Key: LUCENE-8328
> URL: https://issues.apache.org/jira/browse/LUCENE-8328
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 7.4, master (8.0)
> Reporter: Nhat Nguyen
> Priority: Major
> Attachments: LUCENE-8328.patch, LUCENE-8328.patch
>
>
> It's possible for a merge thread to acquire an index reader which is closed
> before it can incRef.
> {noformat}
> Merge stack trace:
> at __randomizedtesting.SeedInfo.seed([136983A068AA2F9D]:0)
> at org.apache.lucene.index.IndexReader.ensureOpen(IndexReader.java:257)
> at org.apache.lucene.index.IndexReader.incRef(IndexReader.java:184)
> at
> org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:198)
> at
> org.apache.lucene.index.ReadersAndUpdates.getReaderForMerge(ReadersAndUpdates.java:728)
> at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4355)
> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4043)
> at
> org.apache.lucene.index.SerialMergeScheduler.merge(SerialMergeScheduler.java:40)
> at org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2145)
> at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:542)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenFromWriter(StandardDirectoryReader.java:288)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:263)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:253)
> at
> org.apache.lucene.index.DirectoryReader.openIfChanged(DirectoryReader.java:140)
> Refresh stack trace:
> at org.apache.lucene.index.IndexReader.decRef(IndexReader.java:238)
> at
> org.apache.lucene.index.ReadersAndUpdates.createNewReaderWithLatestLiveDocs(ReadersAndUpdates.java:675)
> at
> org.apache.lucene.index.ReadersAndUpdates.swapNewReaderWithLatestLiveDocs(ReadersAndUpdates.java:686)
> at
> org.apache.lucene.index.ReadersAndUpdates.getLatestReader(ReadersAndUpdates.java:260)
> at
> org.elasticsearch.index.shard.ElasticsearchMergePolicy.keepFullyDeletedSegment(ElasticsearchMergePolicy.java:143)
> at
> org.apache.lucene.index.ReadersAndUpdates.keepFullyDeletedSegment(ReadersAndUpdates.java:769)
> at org.apache.lucene.index.IndexWriter.isFullyDeleted(IndexWriter.java:5124)
> at org.apache.lucene.index.IndexWriter.writeReaderPool(IndexWriter.java:3306)
> at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:514)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenFromWriter(StandardDirectoryReader.java:288)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:263)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:253)
> at
> org.apache.lucene.index.FilterDirectoryReader.doOpenIfChanged(FilterDirectoryReader.java:104)
> at
> org.apache.lucene.index.DirectoryReader.openIfChanged(DirectoryReader.java:140){noformat}
> The problem is that `ReadersAndUpdates#getLatestReader` is executed
> concurrently without holding lock.
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