When performing  a core swap in SOLR 4.5.1 with persistence on, the two core 
entries that were swapped are duplicated.

Solr.xml

<?xml version="1.0" encoding="UTF-8" ?>
<solr persistent="true" sharedLib="lib">
  <cores adminPath="/admin/cores">
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="howtopolicies" 
dataDir="/data/v8p/solr/howtopolicies/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="wdsc" 
dataDir="/data/v8p/solr/wdsc/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="other" 
dataDir="/data/v8p/solr/other/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="psd" 
dataDir="/data/v8p/solr/psd/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="nat" 
dataDir="/data/v8p/solr/nat/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="wdsc2" 
dataDir="/data/v8p/solr/wdsc2/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="kms2" 
dataDir="/data/v8p/solr/kms/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="howtotools" 
dataDir="/data/v8p/solr/howtotools/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="ewts" 
dataDir="/data/v8p/solr/ewts/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="wdsr" 
dataDir="/data/v8p/solr/wdsr/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="wdsr2" 
dataDir="/data/v8p/solr/wdsr2/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="ce" dataDir="/data/v8p/solr/ce/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="sp2" 
dataDir="/data/v8p/solr/sp2/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="terms" 
dataDir="/data/v8p/solr/terms/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="tools" 
dataDir="/data/v8p/solr/tools/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="kms" 
dataDir="/data/v8p/solr/kms2/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="wdsp" 
dataDir="/data/v8p/solr/wdsp2/data"/>
    <core schema="/data/v8p/solr/root/conf/schema.xml" 
instanceDir="/data/v8p/solr/root/" name="wdsp2" 
dataDir="/data/v8p/solr/wdsp/data"/>
  </cores>
</solr>


Performed swap -

<?xml version="1.0" encoding="UTF-8" ?>
<solr persistent="true" sharedLib="lib">
  <cores adminPath="/admin/cores">
    <core name="ce" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" dataDir="/data/v8p/solr/ce/data"/>
    <core name="ewts" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/ewts/data"/>
    <core name="howtopolicies" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/howtopolicies/data"/>
    <core name="howtotools" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/howtotools/data"/>
    <core name="kms" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" dataDir="/data/v8p/solr/kms/data"/>
    <core name="kms2" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/kms2/data"/>
    <core name="nat" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" dataDir="/data/v8p/solr/nat/data"/>
    <core name="other" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/other/data"/>
    <core name="psd" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" dataDir="/data/v8p/solr/psd/data"/>
    <core name="sp2" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" dataDir="/data/v8p/solr/sp2/data"/>
    <core name="terms" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/terms/data"/>
    <core name="tools" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/tools/data"/>
    <core name="wdsc" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/wdsc/data"/>
    <core name="wdsc2" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/wdsc2/data"/>
    <core name="wdsp" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/wdsp2/data"/>
    <core name="wdsp2" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/wdsp/data"/>
    <core name="wdsr" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/wdsr/data"/>
    <core name="wdsr2" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/wdsr2/data"/>
    <core name="kms" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" dataDir="/data/v8p/solr/kms/data"/>
    <core name="kms2" instanceDir="/data/v8p/solr/root/" 
schema="/data/v8p/solr/root/conf/schema.xml" 
dataDir="/data/v8p/solr/kms2/data"/>
</cores>
</solr>




Jeremy D. Branham
Performance Technologist II
Sprint University Performance Support
Fort Worth, TX | Tel: **DOTNET
Office: +1 (972) 405-2970 | Mobile: +1 (817) 791-1627
http://JeremyBranham.Wordpress.com<http://jeremybranham.wordpress.com/>
http://www.linkedin.com/in/jeremybranham


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