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Date: Thu, 7 Feb 2013 04:21:15 +0000 (UTC)
From: "Joan Touzet (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Message-ID: <JIRA.12631106.1360174526050.257977.1360210875303@arcas>
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Subject: [jira] [Commented] (COUCHDB-1670) Replicator crashes if numbers in
 checkpoint docs are expressed in scientific notation
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    [ https://issues.apache.org/jira/browse/COUCHDB-1670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573175#comment-13573175 ] 

Joan Touzet commented on COUCHDB-1670:
--------------------------------------

I think it's an incorrect assumption that since must always be a base 10 number, scientific notation or not.
                
> 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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