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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2627) MMapDirectory chunking is buggy
Date Fri, 27 Aug 2010 18:06:53 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-2627:
--------------------------------

    Attachment: LUCENE-2627_test.patch

attached is a random test case (wired to a value where it fails quickly for standard codec):

ant test-core -Dtestcase=TestMultiMMap -Dtests.codec=Standard

{noformat}
junit-sequential:
    [junit] Testsuite: org.apache.lucene.store.TestMultiMMap
    [junit] Testcase: testRandomChunkSizes(org.apache.lucene.store.TestMultiMMap):      Caused
an ERROR
    [junit] 233
    [junit] java.lang.ArrayIndexOutOfBoundsException: 233
    [junit]     at org.apache.lucene.store.MMapDirectory$MultiMMapIndexInput.seek(MMapDirectory.java:371)
    [junit]     at org.apache.lucene.store.MMapDirectory$MultiMMapIndexInput.clone(MMapDirectory.java:394)
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.<init>(S
tandardTermsDictReader.java:288)
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader.iterator(StandardTermsDic
tReader.java:270)
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$TermFieldsEnum.terms(StandardTermsDic
tReader.java:240)
    [junit]     at org.apache.lucene.index.MultiFieldsEnum.terms(MultiFieldsEnum.java:103)
    [junit]     at org.apache.lucene.index.codecs.FieldsConsumer.merge(FieldsConsumer.java:49)
    [junit]     at org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:657)
    [junit]     at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:154)
{noformat}

> MMapDirectory chunking is buggy
> -------------------------------
>
>                 Key: LUCENE-2627
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2627
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Store
>            Reporter: Robert Muir
>         Attachments: LUCENE-2627_test.patch
>
>
> MMapDirectory uses chunking with MultiMMapIndexInput.
>  
> Because Java's ByteBuffer uses an int to address the
> values, it's necessary to access a file >
> Integer.MAX_VALUE in size using multiple byte buffers.
> But i noticed from the clover report the entire MultiMMapIndexInput class is completely
untested: no surprise since all tests make tiny indexes.

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