[jira] [Created] (LUCENE-8947) Indexing fails with "too many tokens for field" when using custom term frequencies

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-8947:
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             Summary: Indexing fails with "too many tokens for field" when using custom term frequencies
                 Key: LUCENE-8947
                 URL: https://issues.apache.org/jira/browse/LUCENE-8947
             Project: Lucene - Core
          Issue Type: Improvement
    Affects Versions: 7.5
            Reporter: Michael McCandless


We are using custom term frequencies (LUCENE-7854) to index per-token scoring signals, however for one document that had many tokens and those tokens had fairly large (~998,000) scoring signals, we hit this exception:
{noformat}
2019-08-05T21:32:37,048 [ERROR] (LuceneIndexing-3-thread-3) com.amazon.lucene.index.IndexGCRDocument: Failed to index doc: java.lang.IllegalArgumentException: too many tokens for field "foobar"
at org.apache.lucene.index.DefaultIndexingChain$PerField.invert(DefaultIndexingChain.java:825)
at org.apache.lucene.index.DefaultIndexingChain.processField(DefaultIndexingChain.java:430)
at org.apache.lucene.index.DefaultIndexingChain.processDocument(DefaultIndexingChain.java:394)
at org.apache.lucene.index.DocumentsWriterPerThread.updateDocuments(DocumentsWriterPerThread.java:297)
at org.apache.lucene.index.DocumentsWriter.updateDocuments(DocumentsWriter.java:450)
at org.apache.lucene.index.IndexWriter.updateDocuments(IndexWriter.java:1291)
at org.apache.lucene.index.IndexWriter.addDocuments(IndexWriter.java:1264)
{noformat}
This is happening in this code in {{DefaultIndexingChain.java}}:
{noformat}
  try {
    invertState.length = Math.addExact(invertState.length, invertState.termFreqAttribute.getTermFrequency());
  } catch (ArithmeticException ae) {
    throw new IllegalArgumentException("too many tokens for field \"" + field.name() + "\"");
  }{noformat}
Where Lucene is accumulating the total length (number of tokens) for the field.  But total length doesn't really make sense if you are using custom term frequencies to hold arbitrary scoring signals?  Or, maybe it does make sense, if user is using this as simple boosting, but maybe we should allow this length to be a {{long}}?



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