Przemysław Szeremiota created LUCENE-7791:
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Summary: AIOOBE on flush+sort
Key: LUCENE-7791
URL: https://issues.apache.org/jira/browse/LUCENE-7791
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Affects Versions: 6.5
Reporter: Przemysław Szeremiota
On released 6.5.0 version, flushing operation on sorted index throws
ArrayIndexOutOfBoudException in NumericDocValuesWriter, NormValuesWriter and
BinaryDocValuesWriter.
New SortedXXXIterators are looking up documents in FixedBitSets or PackedValues
based on remapped (sorted) document ID, without checking BitSets/Values ranges,
which are based on original document IDs. Meanwhile FixedBitSets can be sparse
not only in between documents with fields, but also after last (originally)
document with given field (because writer's addValue() is not called for last
documents without values for fields). So remapped (sorted) values range can
have different useful values range and bounds checking should be done for
remapped and not original ID.
We were hit by this bug because your indexes are built from independent sources
by partial updating fragments of documents, so there is always some documents
without values in some fields.
As I understand this bug, it shows when:
- maxDoc is greater than 64 (64 is default pre-allocated size for writers
FixedBitSets)
- some number of last taken documents have empty fields (so FixedBitSet won't
be reallocated to maxDoc)
Also, check for existence of value for given field is now happening based on
original ID, so flushing can now lost some values, even without hitting AIOOBE.
I will attach patch resolving issues with some writers; for other writers from
LUCENE-7579, I am not sure if there are similar bugs in them; patch resolved
our indexing issues, please check changes from LUCENE-7579 for confirmation of
lack of additional bugs in other flush-sorting writers.
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