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https://issues.apache.org/jira/browse/LUCENE-4547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501447#comment-13501447
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Simon Willnauer commented on LUCENE-4547:
-----------------------------------------
one way of merging the two approaches would be a simple boolean that forces
on-disk access. that way we can solve the following problems:
* default merge impls. a format doesn't need to override merge if its an
in-ram by default impl
* people can build auxiliary structures on top without worrying about ram
* leave decisions to the codec what in-memory structure or on-disk structure
it uses by default
this way we can keep the api clean and support expert users. We can even make
this package private so that "normal" users won't see it?
> DocValues field broken on large indexes
> ---------------------------------------
>
> Key: LUCENE-4547
> URL: https://issues.apache.org/jira/browse/LUCENE-4547
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Priority: Blocker
> Fix For: 4.1
>
> Attachments: test.patch
>
>
> I tried to write a test to sanity check LUCENE-4536 (first running against
> svn revision 1406416, before the change).
> But i found docvalues is already broken here for large indexes that have a
> PackedLongDocValues field:
> {code}
> final int numDocs = 500000000;
> for (int i = 0; i < numDocs; ++i) {
> if (i == 0) {
> field.setLongValue(0L); // force > 32bit deltas
> } else {
> field.setLongValue(1<<33L);
> }
> w.addDocument(doc);
> }
> w.forceMerge(1);
> w.close();
> dir.close(); // checkindex
> {code}
> {noformat}
> [junit4:junit4] 2> WARNING: Uncaught exception in thread: Thread[Lucene
> Merge Thread #0,6,TGRP-Test2GBDocValues]
> [junit4:junit4] 2> org.apache.lucene.index.MergePolicy$MergeException:
> java.lang.ArrayIndexOutOfBoundsException: -65536
> [junit4:junit4] 2> at
> __randomizedtesting.SeedInfo.seed([5DC54DB14FA5979]:0)
> [junit4:junit4] 2> at
> org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:535)
> [junit4:junit4] 2> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:508)
> [junit4:junit4] 2> Caused by: java.lang.ArrayIndexOutOfBoundsException:
> -65536
> [junit4:junit4] 2> at
> org.apache.lucene.util.ByteBlockPool.deref(ByteBlockPool.java:305)
> [junit4:junit4] 2> at
> org.apache.lucene.codecs.lucene40.values.FixedStraightBytesImpl$FixedBytesWriterBase.set(FixedStraightBytesImpl.java:115)
> [junit4:junit4] 2> at
> org.apache.lucene.codecs.lucene40.values.PackedIntValues$PackedIntsWriter.writePackedInts(PackedIntValues.java:109)
> [junit4:junit4] 2> at
> org.apache.lucene.codecs.lucene40.values.PackedIntValues$PackedIntsWriter.finish(PackedIntValues.java:80)
> [junit4:junit4] 2> at
> org.apache.lucene.codecs.DocValuesConsumer.merge(DocValuesConsumer.java:130)
> [junit4:junit4] 2> at
> org.apache.lucene.codecs.PerDocConsumer.merge(PerDocConsumer.java:65)
> {noformat}
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