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From "Commit Tag Bot (JIRA)" <>
Subject [jira] [Commented] (LUCENE-4738) Killed JVM when first commit was running will generate a corrupted index
Date Wed, 10 Apr 2013 22:07:16 GMT


Commit Tag Bot commented on LUCENE-4738:

[branch_4x commit] mikemccand

LUCENE-4738: simplify DirectoryReader.indexExists; fix IndexWriter with CREATE to succeed
on a corrupted index; add random IOExceptions to MockDirectoryWrapper.openInput/createOutput
> Killed JVM when first commit was running will generate a corrupted index
> ------------------------------------------------------------------------
>                 Key: LUCENE-4738
>                 URL:
>             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
>         Attachments: LUCENE-4738.patch, LUCENE-4738.patch, LUCENE-4738.patch, LUCENE-4738_test.patch
> 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\tmp\testdir files: [write.lock, _0.fdt,
> 	at org.apache.lucene.index.SegmentInfos$
> 	at
> 	at
> ===========================================================================
> 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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