[jira] [Created] (LUCENE-4738) Killed JVM when first commit was running will generate a corrupted index

["Billow Gao (JIRA)" <ji...@apache.org>]

Billow Gao created LUCENE-4738:
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             Summary: Killed JVM when first commit was running will generate a corrupted index
                 Key: LUCENE-4738
                 URL: https://issues.apache.org/jira/browse/LUCENE-4738
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/index
    Affects Versions: 4.0
         Environment: OS: Linux 2.6.32-220.23.1.el6.x86_64
Java: java version "1.7.0_05"
Lucene: lucene-core-4.0.0 
            Reporter: Billow Gao


1. Start a NEW IndexWriterBuilder on an empty folder,
   add some documents to the index
2. Call commit
3. When the segments_1 file with 0 byte was created, kill the JVM

We will end with a corrupted index with an empty segments_1.

We only have issue with the first commit crash.

Also, if you tried to open an IndexSearcher on a new index. And the first commit on the index was not finished yet. Then you will see exception like:
===========================================================================
org.apache.lucene.index.IndexNotFoundException: no segments* file found in org.apache.lucene.store.MMapDirectory@C:\tmp\testdir lockFactory=org.apache.lucene.store.NativeFSLockFactory@6ee00df: files: [write.lock, _0.fdt, _0.fdx]
	at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:741)
	at org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:52)
	at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:65)
===========================================================================


So when a new index was created, we should first create an empty index. We should not wait for the commit/close call to create the segment file.
If we had an empty index there. It won't leave a corrupted index when there were a power issue on the first commit. 
And a concurrent IndexSearcher can access to the index(No match is better than exception).

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