Hi all, We have an obvious deadlock between a "MaybeRefreshIndexJob" thread calling ReferenceManager.maybeRefresh(ReferenceManager.java:204) and a "RebuildIndexJob" thread calling IndexWriter.deleteAll(IndexWriter.java:2065).
Lucene tries to flush in the "MaybeRefreshIndexJob" thread while simultaneously waiting for the flush in the "RebuildIndexJob" thread deadlocked by the intrinsic lock on the IndexWriter instance. May this be a bug or is it wrong usage? We are not explicitly locking on the IndexWriter instance (following the documentation). Thread-Dump: "Thread - 1" daemon prio=10 tid=0x00007f8fe4006000 nid=0x1ac2 waiting for monitor entry [0x00007f8fa7bf7000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.lucene.index.IndexWriter.useCompoundFile(IndexWriter.java:2223) - waiting to lock <0x00000000f1c00438> (a org.apache.lucene.index.IndexWriter) at org.apache.lucene.index.DocumentsWriterPerThread.sealFlushedSegment(DocumentsWriterPerThread.java:563) at org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:533) at org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:422) at org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:559) at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:365) - locked <0x00000000f1c007d0> (a java.lang.Object) at org.apache.lucene.index.StandardDirectoryReader.doOpenFromWriter(StandardDirectoryReader.java:270) at org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:245) at org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:235) at org.apache.lucene.index.DirectoryReader.openIfChanged(DirectoryReader.java:170) at org.apache.lucene.search.SearcherManager.refreshIfNeeded(SearcherManager.java:118) at org.apache.lucene.search.SearcherManager.refreshIfNeeded(SearcherManager.java:58) at org.apache.lucene.search.ReferenceManager.doMaybeRefresh(ReferenceManager.java:155) at org.apache.lucene.search.ReferenceManager.maybeRefresh(ReferenceManager.java:204) at jobs.MaybeRefreshIndexJob.timeout(MaybeRefreshIndexJob.java:47) "Thread - 2" prio=10 tid=0x00007f903000a000 nid=0x1a38 in Object.wait() [0x00007f9037dd6000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000f1c0c240> (a org.apache.lucene.index.DocumentsWriterFlushControl) at java.lang.Object.wait(Object.java:503) at org.apache.lucene.index.DocumentsWriterFlushControl.waitForFlush(DocumentsWriterFlushControl.java:245) - locked <0x00000000f1c0c240> (a org.apache.lucene.index.DocumentsWriterFlushControl) at org.apache.lucene.index.DocumentsWriter.abort(DocumentsWriter.java:235) - locked <0x00000000f1c05370> (a org.apache.lucene.index.DocumentsWriter) at org.apache.lucene.index.IndexWriter.deleteAll(IndexWriter.java:2065) - locked <0x00000000f1c00438> (a org.apache.lucene.index.IndexWriter) at jobs.RebuildIndexJob.buildIndex(RebuildIndexJob.java:102) Thanks for any help, Sergiusz
