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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4547) DocValues field broken on large indexes
Date Fri, 16 Nov 2012 14:50:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498838#comment-13498838
] 

Robert Muir commented on LUCENE-4547:
-------------------------------------

What would the flush/merge api look like?
Would it get simple or more complicated?
Could we still require certain stats from the Producer, so that we can have a default, efficient
in-RAM Source impl?

{quote}
I think there are many possible optimizations based on how much lengths vary, whether bytes
refs share prefixes or not, ...
{quote}

maybe, but arguably we should do the simplest possible thing that can work given the codecs
we have today. When
designing these apis, to me these are the only ones that exist...

                
> 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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