[ 
http://issues.apache.org/jira/browse/LUCENE-690?page=comments#action_12443625 ] 
            
Yonik Seeley commented on LUCENE-690:
-------------------------------------

: If clone was called while the IndexInput was in the refill() operation before 
readInternal() was called but after the buffer was allocated (i.e. line 64) and 
then clone finished it would copy an empty buffer on line 103, right?

Correct.  BufferedIndexInput also has multiple "pointers", and in the absense 
of synchronization, you can't guarantee the order that things will be flushed 
back to memory.

: So, I guess that would argue that it is not safe and that we should 
aggressively clone (b/c we know it is in a good state) or that we should 
synchronize, right?

Right, you either never use what you are cloning, or you synchronize.


> LazyField use of IndexInput not thread safe
> -------------------------------------------
>
>                 Key: LUCENE-690
>                 URL: http://issues.apache.org/jira/browse/LUCENE-690
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 2.0.1
>            Reporter: Yonik Seeley
>
> Hypothetical problem: IndexInput.clone() of an active IndexInput could result 
> in a corrupt copy.
> LazyField clones the FieldsReader.fieldsStream, which could be in use via 
> IndexReader.document()

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