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https://issues.apache.org/jira/browse/LUCENE-4855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644405#comment-13644405
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Chris Gioran commented on LUCENE-4855:
--------------------------------------

Just as a follow up, it turns out that this was caused by filesystem 
corruption, as caught by fsck. So nothing to see here.
                
> Potential exception in TermInfosWriter#initialize() swallowed makes debugging 
> hard
> ----------------------------------------------------------------------------------
>
>                 Key: LUCENE-4855
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4855
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 3.6.2
>         Environment: Hotspot 1.6.0_31 on Linux 64-bit
>            Reporter: Chris Gioran
>            Priority: Minor
>
> TermInfosWriter#initialize() can potentially fail with an exception when 
> trying to write any of the values in the try block. If that happens the 
> finally clause will be called and that may also fail during close(). This 
> exception will mask the original one potentially hiding the real cause and 
> making debugging such failures difficult.
> My particular case involves failing the first write in the initialize() and 
> close() failing the seek. My code receives:
> Caused by: java.io.IOException: Illegal seek
>         at java.io.RandomAccessFile.seek(Native Method) ~[na:1.6.0_31]
>         at 
> org.apache.lucene.store.FSDirectory$FSIndexOutput.seek(FSDirectory.java:479)
>         at 
> org.apache.lucene.index.TermInfosWriter.close(TermInfosWriter.java:244)
>         at org.apache.lucene.util.IOUtils.close(IOUtils.java:141)
> which provides no indication as to why the initialization failed. The above 
> stack trace has been created with lucene version 3.5.0 but the exception 
> handling is still the same in 3.6.2

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