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From "Jens Alfke (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COUCHDB-1670) Replicator crashes if numbers in checkpoint docs are expressed in scientific notation
Date Wed, 06 Feb 2013 18:17:13 GMT
Jens Alfke created COUCHDB-1670:
-----------------------------------

             Summary: Replicator crashes if numbers in checkpoint docs are expressed in scientific
notation
                 Key: COUCHDB-1670
                 URL: https://issues.apache.org/jira/browse/COUCHDB-1670
             Project: CouchDB
          Issue Type: Bug
          Components: Replication
            Reporter: Jens Alfke


The CouchDB 1.2 replicator process crashes with an Erlang exception when parsing a checkpoint
document read back from a remote database, if numbers in the document were JSON-encoded in
scientific notation instead of as integers. This includes the properties source_last_seq,
end_last_seq, start_last_seq.

That is, the following encoding works fine:
    ..., "source_last_seq": 1234567, ...
whereas this completely-equivalent encoding causes an exception:
    ..., "source_last_seq": 1.234567e+06, ...

This issue raised its head as a result of a CouchDB-compatible engine I'm writing (the Couchbase
Sync Gateway) which can serve as a passive replication endpoint. It's implemented in Go, and
the Go JSON package has the side effect of (a) parsing all JSON numbers into type 'double',
and (b) encoding all doubles into JSON using scientific notation if they're more than six
digits long. The net effect is that when CouchDB stores a checkpoint into the Sync Adapter's
database and then later reads it back, it barfs due to the scientific notation.

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