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From "Nick Kirsch (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3258) File leak when IOException occurs during index optimization.
Date Wed, 29 Jun 2011 19:00:28 GMT
File leak when IOException occurs during index optimization.
------------------------------------------------------------

                 Key: LUCENE-3258
                 URL: https://issues.apache.org/jira/browse/LUCENE-3258
             Project: Lucene - Java
          Issue Type: Bug
          Components: core/index
    Affects Versions: 3.0.3
         Environment: SUSE Linux 11, Java 6
            Reporter: Nick Kirsch
             Fix For: 3.0.3


I am not sure if this issue requires a fix due to the nature of its occurrence, or if it exists
in other versions of Lucene.

I am using Lucene Java 3.0.3 on a SUSE Linux machine with Java 6 and have noticed there are
a number of file handles that are not being released from my java application. There are IOExceptions
in my log regarding disk full, which causes a merge and the optimization to fail. The index
is not currupt upon encountering the IOException. I am using CFS for my index format, so 3X
my largest index size during optimization certainly consumes all of my available disk. 

I realize that I need to add more disk space to my machine, but I investigated how to clean
up the leaking file handles. After failing to find a misuse of Lucene's IndexWriter in the
code I have wrapping Lucene, I did a quick search for close() being invoked in the Lucene
Jave source code. I found a number of source files that attempt to close more than one object
within the same close() method. I think a try/catch should be put around each of these close()
attempts to avoid skipping a subsequent closes. The catch may be able to ignore a caught exception
to avoid masking the original exception like done in SimpleFSDirectory.close().

Locations in Lucene Java source where I suggest a try/catch should be used:
- org.apache.lucene.index.FormatPostingFieldsWriter.finish()
- org.apache.lucene.index.TermInfosWriter.close()
- org.apache.lucene.index.SegmentTermPositions.close()
- org.apache.lucene.index.SegmentMergeInfo.close()
- org.apache.lucene.index.SegmentMerger.mergeTerms() (The finally block)
- org.apache.lucene.index.DirectoryReader.close()
- org.apache.lucene.index.FieldsReader.close()
- org.apache.lucene.index.MultiLevelSkipListReader.close()
- org.apache.lucene.index.MultipleTermPositions.close()
- org.apache.lucene.index.SegmentMergeQueue.close()
- org.apache.lucene.index.SegmentMergeDocs.close()
- org.apache.lucene.index.TermInfosReader.close()

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