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https://issues.apache.org/jira/browse/LUCENE-7440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477144#comment-15477144
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Yonik Seeley commented on LUCENE-7440:
--------------------------------------
Regarding the 1.8B docs number... at least in my tests I saw the top-level skip
distance of ~268M w/ the default codec. Subtracting this from MAX_INT gives
around 1.8B, which is around the number I saw prior to the overflow. To hit
the bug, one also needs to be doing *large* skips toward the end of the index
as well, in order to use the top level(s) of the multi-level skip list. Having
a conjunction query of a highly unique term (or clause) in conjunction with a
common term has a good chance of triggering (example:
+timestamp:39520928456494 +doctype:common)
> Document skipping on large indexes is broken
> --------------------------------------------
>
> Key: LUCENE-7440
> URL: https://issues.apache.org/jira/browse/LUCENE-7440
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 2.2
> Reporter: Yonik Seeley
> Priority: Critical
> Attachments: LUCENE-7440.patch
>
>
> Large skips on large indexes fail.
> Anything that uses skips (such as a boolean query, filtered queries, faceted
> queries, join queries, etc) can trigger this bug on a sufficiently large
> index.
> The bug is a numeric overflow in MultiLevelSkipList that has been present
> since inception (Lucene 2.2). It may not manifest until one has a single
> segment with more than ~1.8B documents, and a large skip is performed on that
> segment.
> Typical stack trace on Lucene7-dev:
> {code}
> java.lang.ArrayIndexOutOfBoundsException: 110
> at
> org.apache.lucene.codecs.MultiLevelSkipListReader$SkipBuffer.readByte(MultiLevelSkipListReader.java:297)
> at org.apache.lucene.store.DataInput.readVInt(DataInput.java:125)
> at
> org.apache.lucene.codecs.lucene50.Lucene50SkipReader.readSkipData(Lucene50SkipReader.java:180)
> at
> org.apache.lucene.codecs.MultiLevelSkipListReader.loadNextSkip(MultiLevelSkipListReader.java:163)
> at
> org.apache.lucene.codecs.MultiLevelSkipListReader.skipTo(MultiLevelSkipListReader.java:133)
> at
> org.apache.lucene.codecs.lucene50.Lucene50PostingsReader$BlockDocsEnum.advance(Lucene50PostingsReader.java:421)
> at YCS_skip7$1.testSkip(YCS_skip7.java:307)
> {code}
> Typical stack trace on Lucene4.10.3:
> {code}
> 6-08-31 18:57:17,460 ERROR org.apache.solr.servlet.SolrDispatchFilter:
> null:java.lang.ArrayIndexOutOfBoundsException: 75
> at
> org.apache.lucene.codecs.MultiLevelSkipListReader$SkipBuffer.readByte(MultiLevelSkipListReader.java:301)
> at org.apache.lucene.store.DataInput.readVInt(DataInput.java:122)
> at
> org.apache.lucene.codecs.lucene41.Lucene41SkipReader.readSkipData(Lucene41SkipReader.java:194)
> at
> org.apache.lucene.codecs.MultiLevelSkipListReader.loadNextSkip(MultiLevelSkipListReader.java:168)
> at
> org.apache.lucene.codecs.MultiLevelSkipListReader.skipTo(MultiLevelSkipListReader.java:138)
> at
> org.apache.lucene.codecs.lucene41.Lucene41PostingsReader$BlockDocsEnum.advance(Lucene41PostingsReader.java:506)
> at org.apache.lucene.search.TermScorer.advance(TermScorer.java:85)
> [...]
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:621)
> [...]
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2004)
> {code}
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