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From "Randall Leeds (JIRA)" <>
Subject [jira] Updated: (COUCHDB-704) Replication can lose checkpoints
Date Wed, 17 Mar 2010 22:47:27 GMT


Randall Leeds updated COUCHDB-704:

    Attachment: rep-history-update-per-checkpoint.patch

And the patch.

I lowered the replication history cap to 5. 50 is rubbish in my opinion. Who needs to know
the last 50 checkpoints? No one (I hope).

> Replication can lose checkpoints
> --------------------------------
>                 Key: COUCHDB-704
>                 URL:
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 0.12
>            Reporter: Randall Leeds
>            Priority: Minor
>         Attachments: rep-history-update-per-checkpoint.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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