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https://issues.apache.org/jira/browse/LUCENE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508910#comment-13508910
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Yonik Seeley commented on LUCENE-4583:
--------------------------------------
Looking at the issue name and the problem that David ran into, this issue is
certainly about more than a missing check during indexing.
Small hidden limits can still cause stuff to blow up in production - the user
may not have thought to test anything above 32K. Small limits need to be
documented.
Like David, I also suspect that the limit was unintended and represents a bug.
The question is on a practical level, how easy is it to raise the limit, and
are there any negative consequences of doing so? If it's not easy (or there
are negative consequences), I think it's OK to leave it at 32K and document it
as a current limitation. Off the top of my head, I can't really think of use
cases that would require more, but perhaps others might?
Of course we should also fail early if someone tries to add a value above that
limit.
> 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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