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https://issues.apache.org/jira/browse/SOLR-3730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434803#comment-13434803
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Mark Miller commented on SOLR-3730:
-----------------------------------
So somehow this screwed up ref counting (which had anther problem as well -
rollback did not release the dir) - that combined with mock dir opening a
writer when you close a dir seemed to be most of the issue here. So a lot of it
test related, but real bugs overall.
> Rollback is not implemented quite right and can cause corner case fails in
> SolrCloud tests.
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-3730
> URL: https://issues.apache.org/jira/browse/SOLR-3730
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 5.0, 4.0
>
>
> Rollback was calling a rollback and then close rather than just a rollback -
> an oversight on my part - somehow this allowed two indexwriters to be open at
> once in some seemingly rare cases...this could cause havoc and was easy to
> miss due to tests using the single lock type.
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