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https://issues.apache.org/jira/browse/SOLR-5397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824991#comment-13824991
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Mark Miller commented on SOLR-5397:
-----------------------------------

I think I've got it - just have to test it out. We actually roll back the 
writer on the main index before we copy the files from the tmp index into - but 
that rollback can actually end up removing files - so we might have skipped 
some files thinking they were already in the std index (because they were), but 
then the rollback can remove them. This causes a corrupt index and opening a 
reader on it rolls back to the first empty commit.

This has been around for some time, but I think recent changes allowed it to be 
exposed in tests.

> Test fails for ChaosMonkeySafeLeaderTest on Apache Jenkins 
> -----------------------------------------------------------
>
>                 Key: SOLR-5397
>                 URL: https://issues.apache.org/jira/browse/SOLR-5397
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.6, 5.0
>
>         Attachments: monkeyrun.log
>
>
> Error Message:
> shard3 is not consistent.  Got 137 from 
> http://127.0.0.1:49317/collection1lastClient and got 125 from 
> http://127.0.0.1:39794/collection1



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