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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Closed: (LUCENE-592) Create compound file after addIndexes but before rewrite of segments
Date Mon, 26 Feb 2007 00:28:05 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Busch closed LUCENE-592.
--------------------------------

       Resolution: Won't Fix
    Fix Version/s: 2.1

The described problem can not occur with Lucene 2.1 anymore. Now in SegmentInfo is stored
whether a segment is in cfs format. After the IndexWriter created a segment in non-cfs format
this new segment is committed with SegmentInfo.isCompoundFile = false. Only if a cfs file
can be written successfully thereafter, the segment is committed with SegmentInfo.isCompoundFile
== true. 
So even if the writing of the cfs file fails for some reason and there is a corrupted cfs
file on disk, it is not referenced by the segments file and thus an IndexReader/writer would
not try to open it.

> Create compound file after addIndexes but before rewrite of segments
> --------------------------------------------------------------------
>
>                 Key: LUCENE-592
>                 URL: https://issues.apache.org/jira/browse/LUCENE-592
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 1.9, 2.0.0
>            Reporter: Karel Tejnora
>            Priority: Minor
>             Fix For: 2.1
>
>         Attachments: createCfthanSegments.diff
>
>
> When compound file format is used new 'segments' file is written before cfs is created.
If there is an exception (disk full, etc.) or it is opened before cfs exists, segments points
to non-existing file.
> This is a small change in index/IndexWriter.java, just a swap a block of code beginning
with if(useCompoundFile) ...

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