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https://issues.apache.org/jira/browse/OAK-8729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16969229#comment-16969229
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Thomas Mueller commented on OAK-8729:
-------------------------------------
I'm afraid I don't know currently how we could make this part more stable...
verifying the directory is still open would be a good idea, but I'm afraid I
don't know currently how to do that without changing a lot of code (basically,
not use the Lucene interfaces).
> Lucene Directory concurrency issue
> ----------------------------------
>
> Key: OAK-8729
> URL: https://issues.apache.org/jira/browse/OAK-8729
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: lucene
> Affects Versions: 1.12.0, 1.14.0, 1.16.0, 1.18.0
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Priority: Major
> Fix For: 1.20.0
>
> Attachments: OAK-8729.patch
>
>
> There is a concurrency issue in the DefaultDirectoryFactory. It is
> reproducible sometimes using CopyOnWriteDirectoryTest.copyOnWrite(), if run
> in a loop (1000 times). The problem is that the MemoryNodeBuilder is used
> concurrently:
> * thread 1 is closing the directory (after writing to it)
> * thread 2 is trying to create a new file
> {noformat}
> at
> org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.exists(MemoryNodeBuilder.java:284)
> at
> org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.setProperty(MemoryNodeBuilder.java:525)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.OakDirectory.close(OakDirectory.java:264)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.BufferedOakDirectory.close(BufferedOakDirectory.java:217)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.CopyOnReadDirectory$2.run(CopyOnReadDirectory.java:305)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> at
> org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.exists(MemoryNodeBuilder.java:284)
> at
> org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.setChildNode(MemoryNodeBuilder.java:362)
> at
> org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.setChildNode(MemoryNodeBuilder.java:356)
> at
> org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.child(MemoryNodeBuilder.java:342)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.OakDirectory.createOutput(OakDirectory.java:214)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.BufferedOakDirectory.createOutput(BufferedOakDirectory.java:178)
> at org.apache.lucene.store.Directory.copy(Directory.java:184)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.CopyOnWriteDirectory$3.call(CopyOnWriteDirectory.java:322)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.CopyOnWriteDirectory$3.call(CopyOnWriteDirectory.java:1)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.CopyOnWriteDirectory$2$1.call(CopyOnWriteDirectory.java:105)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.directory.CopyOnWriteDirectory$2$1.call(CopyOnWriteDirectory.java:1)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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