Replication: _replicate does not finish replication in one pass and has to be
invoked repeatedly
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Key: COUCHDB-516
URL: https://issues.apache.org/jira/browse/COUCHDB-516
Project: CouchDB
Issue Type: Bug
Components: Database Core
Affects Versions: 0.10
Environment: Mac OS X 10.5 w/ CouchDB 0.10.x multiple revisions
(latest is 820436)
Ubuntu Desktop 9.04 w/ CouchDB 0.10.x multiple revisions (latest is 818247)
Reporter: Ning Tan
When we replicate between a remote database and a local one (pulling from
remote into local), we are observing partial replications, meaning that we have
to issue repeated _replicate calls for the replication to complete. For a
database with 17,000 documents, for example, it could take up to 7 calls for
the entire database to replicate into an empty one. Each time, the number of
documents replicated over seemed random.
The use case is very simple--replicating a database into an empty one with no
concurrent writes, no additional load or i/o, etc. The databases involved are a
mixture of the 10.0.x code base natively built on Ubuntu and Mac.
It seems to me that every (not all) partial replication process is associated
with a corresponding entry in the log that says "recording a checkpoint at
source update_seq .....". (i.e. you can match the recorded_seq number in the
replication response with the checkpoint update_seq numbers in the log).
Futon vs. curl doesn't make a difference.
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