Thomas Mueller created OAK-8729:
-----------------------------------
Summary: Lucene Directory concurrency issue
Key: OAK-8729
URL: https://issues.apache.org/jira/browse/OAK-8729
Project: Jackrabbit Oak
Issue Type: Improvement
Components: lucene
Reporter: Thomas Mueller
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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