Nhat Nguyen created LUCENE-8328:
-----------------------------------
Summary: 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
It's possible for a merge thread to acquire an index reader which is closed
before it can incRef.
** Merge stack trace:*
{noformat}
Caused by: org.apache.lucene.store.AlreadyClosedException: this IndexReader is
closed 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)
at
org.apache.lucene.index.TestSoftDeletesRetentionMergePolicy.lambda$testMergeAndRefreshDeletedSegmentsConcurrently$21(TestSoftDeletesRetentionMergePolicy.java:597)
... 1 more
{noformat}
** Refresh stack trace:*
{noformat}
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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
