You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2019/05/02 23:54:00 UTC
[jira] [Created] (LUCENE-8790) Spooky exception merging doc values
Michael McCandless created LUCENE-8790:
------------------------------------------
Summary: Spooky exception merging doc values
Key: LUCENE-8790
URL: https://issues.apache.org/jira/browse/LUCENE-8790
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Affects Versions: 7.5
Environment: We are on a Lucene 7.x snapshot, githash
935b0c89c6ecb446d7f05d938207760cd64bcd04, using the default Codec, with a static sort.
Reporter: Michael McCandless
We hit this exciting exception; we don't have a test case reproducing it, and staring at the code, I don't see how we can hit a {{NullPointerException}} on this line:
{noformat}
[May 2, 2019, 7:24 PM] Barrowman, Adam: 2019-05-02T18:32:10,561 [ERROR] (Lucene Merge Thread #1) com.amazon.lucene.util.UncaughtExceptionHandler: Uncaught exception: org.apache.lucene.index.MergePolicy$MergeException: java.lang.NullPointerException in thread Thread[Lucene Merge Thread #1,5,main] org.apache.lucene.index.MergePolicy$MergeException: java.lang.NullPointerException
at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
Caused by: java.lang.NullPointerException
at org.apache.lucene.codecs.lucene70.Lucene70DocValuesConsumer.writeValuesSingleBlock(Lucene70DocValuesConsumer.java:279)
at org.apache.lucene.codecs.lucene70.Lucene70DocValuesConsumer.writeValues(Lucene70DocValuesConsumer.java:263)
at org.apache.lucene.codecs.lucene70.Lucene70DocValuesConsumer.addSortedNumericField(Lucene70DocValuesConsumer.java:536)
at org.apache.lucene.codecs.DocValuesConsumer.mergeSortedNumericField(DocValuesConsumer.java:371)
at org.apache.lucene.codecs.DocValuesConsumer.merge(DocValuesConsumer.java:143)
at org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:151)
at org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:182)
at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:126)
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4438)
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4060)
at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
at com.amazon.lucene.index.ConcurrentMergeSchedulerWrapper.doMerge(ConcurrentMergeSchedulerWrapper.java:54)
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
{noformat}
It seems like the {{encode.get(v)}} somehow returned null, which should not happen as long as the values we iterated from the {{SortedNumericValues}} were the same up above (in {{writeValues}}) and in {{writeValuesSingleBlock}}. Confused...
Note that we are using a 7.x snapshot, so it is possible this was a bug in 7.x at that time, fixed before the next 7.x release though when I compare the affected code against 8.x backwards codec, it looks the same.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org