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https://issues.apache.org/jira/browse/LUCENE-5939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130013#comment-14130013
 ] 

Uwe Schindler commented on LUCENE-5939:
---------------------------------------

I extracted the 410.cfs.zip file and ran checkindex on it:

{noformat}
C:\Users\Uwe Schindler\Desktop>java -cp lucene-core-4.11.0-SNAPSHOT.jar 
org.apache.lucene.index.CheckIndex index

NOTE: testing will be more thorough if you run java with 
'-ea:org.apache.lucene...', so assertions are enabled

Opening index @ index

Segments file=segments_3 numSegments=5 version=4.11.0 
id=90e2ef40edf76628be731bdca9c8faab format=
  1 of 5: name=_0 docCount=10
    version=4.11.0
    id=90e2ef40edf76628be731bdca9c8faa4
    codec=Lucene410
    compound=true
    numFiles=4
    size (MB)=0.008
    diagnostics = {timestamp=1409886841199, os=Mac OS X, os.version=10.9.4, 
source=flush, lucene.version=4.11.0, os.arch=x86_64, jav
a.version=1.7.0_60, java.vendor=Oracle Corporation}
    has deletions [delGen=1]
    test: open reader.........OK
    test: check integrity.....OK
    test: check live docs.....OK [1 deleted docs]
    test: fields..............OK [25 fields]
    test: field norms.........OK [7 fields]
    test: terms, freq, prox...OK [64 terms; 360 terms/docs pairs; 333 tokens]
    test (ignoring deletes): terms, freq, prox...OK [67 terms; 400 terms/docs 
pairs; 370 tokens]
    test: stored fields.......OK [63 total field count; avg 7 fields per doc]
    test: term vectors........OK [54 total vector count; avg 6 term/freq vector 
fields per doc]
    test: docvalues...........OK [15 docvalues fields; 4 BINARY; 7 NUMERIC; 2 
SORTED; 1 SORTED_NUMERIC; 1 SORTED_SET]

  2 of 5: name=_1 docCount=10
    version=4.11.0
    id=90e2ef40edf76628be731bdca9c8faa5
    codec=Lucene410
    compound=true
    numFiles=3
    size (MB)=0.008
    diagnostics = {timestamp=1409886841241, os=Mac OS X, os.version=10.9.4, 
source=flush, lucene.version=4.11.0, os.arch=x86_64, jav
a.version=1.7.0_60, java.vendor=Oracle Corporation}
    no deletions
    test: open reader.........OK
    test: check integrity.....OK
    test: check live docs.....OK
    test: fields..............OK [25 fields]
    test: field norms.........OK [7 fields]
    test: terms, freq, prox...OK [67 terms; 400 terms/docs pairs; 370 tokens]
    test: stored fields.......OK [70 total field count; avg 7 fields per doc]
    test: term vectors........OK [60 total vector count; avg 6 term/freq vector 
fields per doc]
    test: docvalues...........OK [15 docvalues fields; 4 BINARY; 7 NUMERIC; 2 
SORTED; 1 SORTED_NUMERIC; 1 SORTED_SET]

  3 of 5: name=_2 docCount=10
    version=4.11.0
    id=90e2ef40edf76628be731bdca9c8faa6
    codec=Lucene410
    compound=true
    numFiles=3
    size (MB)=0.008
    diagnostics = {timestamp=1409886841273, os=Mac OS X, os.version=10.9.4, 
source=flush, lucene.version=4.11.0, os.arch=x86_64, jav
a.version=1.7.0_60, java.vendor=Oracle Corporation}
    no deletions
    test: open reader.........OK
    test: check integrity.....OK
    test: check live docs.....OK
    test: fields..............OK [25 fields]
    test: field norms.........OK [7 fields]
    test: terms, freq, prox...OK [67 terms; 400 terms/docs pairs; 370 tokens]
    test: stored fields.......OK [70 total field count; avg 7 fields per doc]
    test: term vectors........OK [60 total vector count; avg 6 term/freq vector 
fields per doc]
    test: docvalues...........OK [15 docvalues fields; 4 BINARY; 7 NUMERIC; 2 
SORTED; 1 SORTED_NUMERIC; 1 SORTED_SET]

  4 of 5: name=_3 docCount=5
    version=4.11.0
    id=90e2ef40edf76628be731bdca9c8faa7
    codec=Lucene410
    compound=true
    numFiles=3
    size (MB)=0.007
    diagnostics = {timestamp=1409886841292, os=Mac OS X, os.version=10.9.4, 
source=flush, lucene.version=4.11.0, os.arch=x86_64, jav
a.version=1.7.0_60, java.vendor=Oracle Corporation}
    no deletions
    test: open reader.........OK
    test: check integrity.....OK
    test: check live docs.....OK
    test: fields..............OK [25 fields]
    test: field norms.........OK [7 fields]
    test: terms, freq, prox...OK [52 terms; 200 terms/docs pairs; 185 tokens]
    test: stored fields.......OK [35 total field count; avg 7 fields per doc]
    test: term vectors........OK [30 total vector count; avg 6 term/freq vector 
fields per doc]
    test: docvalues...........OK [15 docvalues fields; 4 BINARY; 7 NUMERIC; 2 
SORTED; 1 SORTED_NUMERIC; 1 SORTED_SET]

  5 of 5: name=_4 docCount=1
    version=4.11.0
    id=90e2ef40edf76628be731bdca9c8faa9
    codec=Lucene410
    compound=true
    numFiles=3
    size (MB)=0.001
    diagnostics = {timestamp=1409886841318, os=Mac OS X, os.version=10.9.4, 
source=flush, lucene.version=4.11.0, os.arch=x86_64, jav
a.version=1.7.0_60, java.vendor=Oracle Corporation}
    no deletions
    test: open reader.........OK
    test: check integrity.....OK
    test: check live docs.....OK
    test: fields..............OK [2 fields]
    test: field norms.........OK [1 fields]
    test: terms, freq, prox...OK [1 terms; 1 terms/docs pairs; 0 tokens]
    test: stored fields.......OK [2 total field count; avg 2 fields per doc]
    test: term vectors........OK [0 total vector count; avg 0 term/freq vector 
fields per doc]
    test: docvalues...........OK [0 docvalues fields; 0 BINARY; 0 NUMERIC; 0 
SORTED; 0 SORTED_NUMERIC; 0 SORTED_SET]

No problems were detected with this index.
{noformat}

So this index was created with 4.11.0, no idea how this happened! So the RM 
Ryan seem to created a wrong index!

> 4.10.1 cannot read 4.10 indexes
> -------------------------------
>
>                 Key: LUCENE-5939
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5939
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Priority: Blocker
>
> Thank you mike for the smoketester addition. It failed because 4.10.1 was not 
> verifying backwards compatibility against 4.10
> However, when i added the indexes (svn copied from branch-4x), the test fails.



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