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https://issues.apache.org/jira/browse/LUCENE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657156#comment-13657156
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Adrien Grand commented on LUCENE-4583:
--------------------------------------
bq. store the lengths instead as absolute offsets with
MonotonicAppendingLongBuffer (this should be more efficient)
I just had a quick discussion about this with Robert, and since
AppendingLongBuffer stores deltas from the minimum value of the block (and not
0), AppendingLongBuffer is better (ie. faster and more compact) than
MonotonicAppendingLongBuffer to store lengths. This means that if all lengths
are 7, 8 or 9 in a block, it will only require 2 bits per value instead of 4.
> 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
> Fix For: 4.4
>
> Attachments: LUCENE-4583.patch, LUCENE-4583.patch, LUCENE-4583.patch,
> LUCENE-4583.patch
>
>
> 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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