Hi,
I am working on a research project on data race detection, and am using the DaCapo benchmarks for evaluation. I am using the benchmark lusearch from the 2009 suite, which uses lucene library 2.4.1. For one test case, I am monitoring a pair of accesses say, Lorg/apache/lucene/store/Directory;.<init> ()V:40(6) and Lorg/apache/lucene/store/FSDirectory;.close ()V:524(1). The format is <class name>.<method name> <method desc>:line(byte code index). During my work, I am getting AlreadyClosedExceptions on the FSDirectory from the ensureOpen() method for some threads, which I am guessing is probably due to an order violation. I have actually introduced delays in my instrumentation which delays threads that execute the code in Lorg/apache/lucene/store/FSDirectory;.close ()V. This is causing the other query threads to throw an exception. Here is the exception trace: org.apache.lucene.store.AlreadyClosedException: this Directory is closed at org.apache.lucene.store.Directory.ensureOpen(Directory.java:220) at org.apache.lucene.store.FSDirectory.list(FSDirectory.java:320) at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:533) at org.apache.lucene.index.DirectoryIndexReader.open(DirectoryIndexReader.java:115) at org.apache.lucene.index.IndexReader.open(IndexReader.java:316) at org.apache.lucene.index.IndexReader.open(IndexReader.java:206) at org.dacapo.lusearch.Search$QueryProcessor.<init>(Search.java:207) at org.dacapo.lusearch.Search$QueryThread.run(Search.java:179) org.apache.lucene.store.AlreadyClosedException: this Directory is closed at org.apache.lucene.store.Directory.ensureOpen(Directory.java:220) at org.apache.lucene.store.FSDirectory.list(FSDirectory.java:320) at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:533) at org.apache.lucene.index.DirectoryIndexReader.open(DirectoryIndexReader.java:115) at org.apache.lucene.index.IndexReader.open(IndexReader.java:316) at org.apache.lucene.index.IndexReader.open(IndexReader.java:206) at org.dacapo.lusearch.Search$QueryProcessor.<init>(Search.java:207) at org.dacapo.lusearch.Search$QueryThread.run(Search.java:179) java.lang.NullPointerException at org.dacapo.lusearch.Search$QueryProcessor.run(Search.java:226) at org.dacapo.lusearch.Search$QueryThread.run(Search.java:179) java.lang.NullPointerException at org.dacapo.lusearch.Search$QueryProcessor.run(Search.java:226) at org.dacapo.lusearch.Search$QueryThread.run(Search.java:179) org.apache.lucene.store.AlreadyClosedException: this Directory is closed at org.apache.lucene.store.Directory.ensureOpen(Directory.java:220) at org.apache.lucene.store.FSDirectory.list(FSDirectory.java:320) at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:533) at org.apache.lucene.index.DirectoryIndexReader.open(DirectoryIndexReader.java:115) at org.apache.lucene.index.IndexReader.open(IndexReader.java:316) at org.apache.lucene.index.IndexReader.open(IndexReader.java:206) at org.dacapo.lusearch.Search$QueryProcessor.<init>(Search.java:207) at org.dacapo.lusearch.Search$QueryThread.run(Search.java:179) java.lang.NullPointerException at org.dacapo.lusearch.Search$QueryProcessor.run(Search.java:226) at org.dacapo.lusearch.Search$QueryThread.run(Search.java:179) It would help if someone can give suggestions as to what can be going wrong here. I have verified that the issue isn't probably in my instrumentation. Just simply instrumenting the lucene source locations with sleeps() also reproduces the error. --Regards, Swarnendu Biswas.
