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https://issues.apache.org/jira/browse/LUCENE-3295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061992#comment-13061992
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Robert Muir commented on LUCENE-3295:
-------------------------------------

we can have a true/false setter on MDW (randomizeIOContexts), so we control if 
it respects the 
given one (e.g. tests that actually want to test IOContext works) or not.

> BitVector never skips fully populated bytes when writing ClearedDgaps
> ---------------------------------------------------------------------
>
>                 Key: LUCENE-3295
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3295
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: core/other
>    Affects Versions: 3.4, 4.0
>            Reporter: Simon Willnauer
>            Assignee: Simon Willnauer
>            Priority: Minor
>             Fix For: 3.4, 4.0
>
>         Attachments: LUCENE-3295.patch
>
>
> When writing cleared DGaps in BitVector we compare a byte against 0xFF (255) 
> yet the byte is casted into an int (-1) and the comparison will never 
> succeed. We should mask the byte with 0xFF before comparing or compare 
> against -1

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