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From "Filipe Manana (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-704) Replication can lose checkpoints
Date Sat, 16 Oct 2010 12:41:22 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921681#action_12921681
] 

Filipe Manana commented on COUCHDB-704:
---------------------------------------

Randall,

I don't see nothing wrong with the patch, but whenever the replicator can't save a checkpoint,
it retries (for remote DBs) and stops.
So I don't see exactly how you can loose 3 months of replication checkpoints.

Nevertheless, I would like to know Adam's point of view as well.

> 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: 0.11.2, 1.0.1
>            Reporter: Randall Leeds
>            Priority: Minor
>         Attachments: keep_session_id.patch, 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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