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Date: Sun, 28 Jun 2009 21:42:47 -0700 (PDT)
From: "Paul Joseph Davis (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Subject: [jira] Commented: (COUCHDB-120) Allow databases to be "rolled back"
 to a specific sequence ID.
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    [ https://issues.apache.org/jira/browse/COUCHDB-120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725036#action_12725036 ] 

Paul Joseph Davis commented on COUCHDB-120:
-------------------------------------------

Now that we have tail append headers we could do this pretty easily at the batch level IIUC. I reckon implementation would be "read back to last valid header, append a copy of it to end of file" type of operation.

> Allow databases to be "rolled back" to a specific sequence ID.
> --------------------------------------------------------------
>
>                 Key: COUCHDB-120
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-120
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Database Core
>    Affects Versions: 0.8.1
>            Reporter: Jan Lehnardt
>            Priority: Minor
>
> Rolling back databases to a specific seq_id would allow for "undoing" replication. possible use-cases included replication with an untrustworthy replication partner. 
> (we should think about repl-ed and advocate safer-replication. advocating abstinence is another option, but that system is prone to #fail).

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