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https://issues.apache.org/jira/browse/OAK-9052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112977#comment-17112977
 ] 

Nitin Gupta commented on OAK-9052:
----------------------------------

A test fails for me
{code:java}
[ERROR] Tests run: 6, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 0.169 s 
<<< FAILURE! - in 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest
[ERROR] 
simpleTraversal(org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest)
  Time elapsed: 0.047 s  <<< ERROR!
java.lang.IllegalStateException: java.io.IOException: Unable to delete file: 
target\test
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.newFlatFileStore(FlatFileStoreIteratorTest.java:52)
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.simpleTraversal(FlatFileStoreIteratorTest.java:61)
Caused by: java.io.IOException: Unable to delete file: target\test
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.newFlatFileStore(FlatFileStoreIteratorTest.java:52)
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.simpleTraversal(FlatFileStoreIteratorTest.java:61)[ERROR]
 
invalidOrderAccess(org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest)
  Time elapsed: 0 s  <<< ERROR!
java.lang.IllegalStateException: java.io.IOException: Unable to delete file: 
target\test
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.newFlatFileStore(FlatFileStoreIteratorTest.java:52)
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.invalidOrderAccess(FlatFileStoreIteratorTest.java:96)
Caused by: java.io.IOException: Unable to delete file: target\test
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.newFlatFileStore(FlatFileStoreIteratorTest.java:52)
        at 
org.apache.jackrabbit.oak.index.indexer.document.flatfile.FlatFileStoreIteratorTest.invalidOrderAccess(FlatFileStoreIteratorTest.java:96)

{code}
 

Seems like specific to windows env.

> Reindexing using --doc-traversal-mode may need a lot of memory
> --------------------------------------------------------------
>
>                 Key: OAK-9052
>                 URL: https://issues.apache.org/jira/browse/OAK-9052
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: indexing, mongomk
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>            Priority: Major
>             Fix For: 1.28.0
>
>         Attachments: fileSizeOverTime.png
>
>
> Indexing using oak-run and --doc-traversal-mode uses the FlatFileStore. For 
> aggregation, there is a limit on memory usage, by default around 100 MB. 
> Depending on the content structure, this limit can be exceeded. 
> It would be good to find a way to avoid a memory limit, for example using a 
> temporary storage (a file, or a persistent key/value store).



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