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https://issues.apache.org/jira/browse/HADOOP-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12467704
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Hadoop QA commented on HADOOP-602:
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+1, because
http://issues.apache.org/jira/secure/attachment/12349642/lucene-dep.patch
applied and successfully tested against trunk revision r500023.
> Remove Lucene dependency
> ------------------------
>
> Key: HADOOP-602
> URL: https://issues.apache.org/jira/browse/HADOOP-602
> Project: Hadoop
> Issue Type: Improvement
> Affects Versions: 0.8.0
> Reporter: Andrzej Bialecki
> Assigned To: Milind Bhandarkar
> Fix For: 0.11.0
>
> Attachments: lucene-dep.patch
>
>
> Hadoop uses just a single class from Lucene, namely the PriorityQueue. I
> propose to remove this dependency by copying this class into
> org.apache.hadoop.util.PriorityQueue and removing lucene-core.jar from
> dependencies.
> Removing this dependency makes it easier to run map-reduce applications that
> use different versions of Lucene.
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