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https://issues.apache.org/jira/browse/SOLR-4203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533474#comment-13533474
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Mark Miller commented on SOLR-4203:
-----------------------------------

bq. Seems more straightforward to delete the directory before initializing the 
log.
Only tricky part there is finding out where the directory is.

Yeah, that is actually what I was going to do first. But the getting the tlog 
dir was no so straightforward and that is why I went this way.

This only happens on startup though, so I'm not sure why it would be a problem? 
It will be single threaded and before anything is being accessed.

It does still seem strange to me that I cannot close the update log and delete 
it's data dir. That fails and we are not even to opening a new one yet.
                
> An ephemeral directory implementation should cause the transaction log to be 
> ignored on startup.
> ------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-4203
>                 URL: https://issues.apache.org/jira/browse/SOLR-4203
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 4.1, 5.0
>
>         Attachments: SOLR-4203.patch
>
>
> If you are using something like ram dir, you can restart a node and if no 
> updates have come in, it will think its up to date but be empty - we should 
> clear the update log in these cases on startup.

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