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From "Randall Leeds (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-704) Replication can lose checkpoints
Date Fri, 14 May 2010 22:57:42 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867724#action_12867724
] 

Randall Leeds commented on COUCHDB-704:
---------------------------------------

Looking over this once more.

If we only append to the replication log, would it be more accurate to clear the stats after
each checkpoint?
The last log entry in the reply to a client request for non-continuous replication won't show
the total number of documents replicated, but only the number since the last checkpoint. I
don't know the best way to address this.

> Replication can lose checkpoints
> --------------------------------
>
>                 Key: COUCHDB-704
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-704
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 0.12
>            Reporter: Randall Leeds
>            Priority: Minor
>         Attachments: save-all-rep-checkpoints.patch, whitespace.patch
>
>   Original Estimate: 0h
>  Remaining Estimate: 0h
>
> When saving replication checkpoints in the _local/<repid> document the new entry
is always pushed onto the _original_ "history" list property that existed at the start of
the replication. When any number of things causes the checkpoint to be written to only one
of the databases the head of the history list gets out of sync. Subsequent attempts to start
this replication must start from the latest common replication log entry in the _original_
history, as though this replication never occurred.
> A better idea is to push every checkpoint onto the history instead of replacing the head
on each save.

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