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https://issues.apache.org/jira/browse/LUCENE-5650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14004367#comment-14004367
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Dawid Weiss commented on LUCENE-5650:
-------------------------------------

Commit it to the branch, Ryan. I fixed it the way I understand how Solr's 
source code works (which is to say: vaguely familiar). I'm sure your patch is 
better.

The build yesterday ended with this failure related to perm. denied:
{code}
[13:07:35.284] ERROR   0.00s J1 | TestFoldingMultitermExtrasQuery (suite) <<<   
 
> Throwable #1: org.apache.solr.common.SolrException: SolrCore 'collection1' is 
> not available due to init failure: access denied ("java.io.FilePermission" 
> "analysis-extras\solr\collection1\conf" "write")
{code}

and the following, I guess notorious offenders:
{code}
  - org.apache.solr.spelling.suggest.TestAnalyzeInfixSuggestions (could not 
remove temp. files)
  - TestBlendedInfixSuggestions (same thing)

  - org.apache.solr.cloud.SyncSliceTest.testDistribSearch
   > Throwable #1: org.apache.solr.client.solrj.SolrServerException: No live 
SolrServers available to handle this request

  - org.apache.solr.cloud.RecoveryZkTest.testDistribSearch 
   > Throwable #1: java.lang.AssertionError: shard1 is not consistent.  Got 92 
from https://127.0.0.1:54379/_koq/fr/collection1lastClient and got 60 from 
https://127.0.0.1:54410/_koq/fr/collection1
{code}

I won't be able to return to this today (maybe in the evening). Change my DIH 
fixes to yours on the branch -- I don't mind at all.

> createTempDir and associated functions no longer create java.io.tmpdir
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-5650
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5650
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: general/test
>            Reporter: Ryan Ernst
>            Assignee: Dawid Weiss
>            Priority: Minor
>             Fix For: 4.9, 5.0
>
>         Attachments: LUCENE-5650.patch, LUCENE-5650.patch, LUCENE-5650.patch, 
> LUCENE-5650.patch, dih.patch
>
>
> The recent refactoring to all the create temp file/dir functions (which is 
> great!) has a minor regression from what existed before.  With the old 
> {{LuceneTestCase.TEMP_DIR}}, the directory was created if it did not exist.  
> So, if you set {{java.io.tmpdir}} to {{"./temp"}}, then it would create that 
> dir within the per jvm working dir.  However, {{getBaseTempDirForClass()}} 
> now does asserts that check the dir exists, is a dir, and is writeable.
> Lucene uses {{"."}} as {{java.io.tmpdir}}.  Then in the test security 
> manager, the per jvm cwd has read/write/execute permissions.  However, this 
> allows tests to write to their cwd, which I'm trying to protect against (by 
> setting cwd to read/execute in my test security manager).



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