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https://issues.apache.org/jira/browse/LUCENE-4613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529065#comment-13529065
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Renaud Delbru commented on LUCENE-4613:
---------------------------------------

{quote}
Yes I think it'd be even better. You can use 
_TestUtil#randomSimpleString(Random, int maxLength).
{quote}

In fact, using random segment suffix is very difficult to achieve, as we cannot 
ensure that the codec instantiated through SPI will get the same segment suffix 
as the codec instantiated in the {{TestCompressingStoredFieldsFormat#setUp()}, 
and therefore the {{_TestUtil#checkIndex(Directory dir)}} will fail. The 
segment suffix must be deterministic, e.g., similar to the current solution 
using the formatName as segment suffix.
                
> CompressingStoredFieldsWriter ignores the segment suffix if writing aborted
> ---------------------------------------------------------------------------
>
>                 Key: LUCENE-4613
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4613
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/codecs
>    Affects Versions: 4.1
>            Reporter: Renaud Delbru
>             Fix For: 4.1
>
>         Attachments: LUCENE-4613.patch, LUCENE-4613.patch
>
>
> If the writing is aborted, CompressingStoredFieldsWriter does not remove 
> partially-written files as the segment suffix is not taken into consideration.

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