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https://issues.apache.org/jira/browse/LUCENE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13509117#comment-13509117
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Yonik Seeley commented on LUCENE-4583:
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bq. I am working on, we need more than 32k bytes for our DocValues. We need 
that much rarely, but we still need that much to keep the search functioning.

Thanks!  I suspected one generic use case would be "normally small, but hard to 
put an upper bound on".  That's great if the only issue really is 
PagedBytes.fillSlices()!  That definitely shouldn't have any performance impact 
since the first "if" will always be true in the common case.

bq. Edit: This only works when start == 0. Seeing if I can fix it.

A simple loop might be easiest to understand, rather than calculating with DIV 
and MOD?

                
> StraightBytesDocValuesField fails if bytes > 32k
> ------------------------------------------------
>
>                 Key: LUCENE-4583
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4583
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 4.0, 4.1, 5.0
>            Reporter: David Smiley
>            Priority: Critical
>
> I didn't observe any limitations on the size of a bytes based DocValues field 
> value in the docs.  It appears that the limit is 32k, although I didn't get 
> any friendly error telling me that was the limit.  32k is kind of small IMO; 
> I suspect this limit is unintended and as such is a bug.    The following 
> test fails:
> {code:java}
>   public void testBigDocValue() throws IOException {
>     Directory dir = newDirectory();
>     IndexWriter writer = new IndexWriter(dir, writerConfig(false));
>     Document doc = new Document();
>     BytesRef bytes = new BytesRef((4+4)*4097);//4096 works
>     bytes.length = bytes.bytes.length;//byte data doesn't matter
>     doc.add(new StraightBytesDocValuesField("dvField", bytes));
>     writer.addDocument(doc);
>     writer.commit();
>     writer.close();
>     DirectoryReader reader = DirectoryReader.open(dir);
>     DocValues docValues = MultiDocValues.getDocValues(reader, "dvField");
>     //FAILS IF BYTES IS BIG!
>     docValues.getSource().getBytes(0, bytes);
>     reader.close();
>     dir.close();
>   }
> {code}

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