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From "Nabeel Shahzad (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5180) NodeJS Thrift generated file incorrectly parses map/list/sets when doubles/floats are used
Date Tue, 22 Jan 2013 18:52:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559870#comment-13559870
] 

Nabeel Shahzad commented on CASSANDRA-5180:
-------------------------------------------

Will do, thanks
                
> NodeJS Thrift generated file incorrectly parses map/list/sets when doubles/floats are
used
> ------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5180
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5180
>             Project: Cassandra
>          Issue Type: Bug
>          Components: API
>    Affects Versions: 1.2.0
>            Reporter: Nabeel Shahzad
>
> When a double/float is used in a map (key or value), list, or set types, the decoding
is done as a utf8 string, which then incorrectly parses and adds extra bytes.
> For example:
> The bytes of a map <double, double> (this is coming out of the Thrift call)
> {noformat}
> 00 01 00 08 3f f4 00 00 00 00 00 00 00 08 40 02 00 00 00 00 00 00
> {noformat}
> But after it's been parsed out from the field as UTF8:
> {noformat}
> 00 01 00 08 3f 3f 00 00 00 00 00 00 00 08 40 02 00 00 00 00 00 00
> {noformat}
> As you can see there's an incorrect byte (the 3f where the f4, and an extra 00). For
reference, this value was map<double, double> = {1.25: 2.25}. This is the same behavior
for floats. The f4 translated to ASCII 247, which I believe isn't a valid utf8 code.
> The actual value of the field becomes:
> {noformat}
>   value: '\u0000\u0002\u0000\b??\u0000\u0000\u0000\u0000\u0000\u0000\u0000\b@\u0002\u0000\u0000\u0000\u0000\u0000\u0000''
> {noformat}
> Where the \b = 8, ? = f4, ? = unknown char.
> I have seen cases where there are *extra* bytes added in, which breaks the parsing based
on byte size:
> {noformat}
> 00 01 00 08 40 24 48 72 c2 b0 20 c3 84 c2 9c 00 08 40 34 c3 bc c3 93 5a c2 85 c2 87 c2
94
> {noformat}
> Where the MAP value was {10.1415, 20.9876}. On a list or set, using either value also
yields extra bytes.
> So this messes up any parsing based on the byte-length for the field, since there are
a variable number of extra bytes added, either to the key or value of the map, and any values
of a list. I believe this could also happen on high-integer values.
> It seems to me when the "ftype" is parsed (int16) before the actual field, it's returning
a TYPE value of "11" (string) - instead of the proper value of a map/set/list. 
> For reference, the table, and an insert example:
> {noformat}
> CREATE TABLE sample_map (
>     id text PRIMARY KEY, 
>     map_col_text map < text, text >, 
>     map_col_int map < int, text >, 
>     map_col_float map < float, float >,
>     map_col_double map < double, double >
> );
> INSERT INTO sample_map (id, map_col_double) VALUES('DOUBLE_ROW_SINGLE', {10.1415: 20.9876});
> {noformat}
> Not sure if it matters, but this was using CQL3. Also, we are not seeing this on the
C++ generated Thrift interface.
> Versions:
> {noformat}
> cqlsh:orion> show version;
> [cqlsh 2.3.0 | Cassandra 1.2.0 | CQL spec 3.0.0 | Thrift protocol 19.35.0]
> {noformat}
> {noformat}
> $ thrift --version
> Thrift version 0.9.0
> {noformat}
> {noformat}
>  "name": "node-thrift",
>   "description": "node.js bindings for the Apache Thrift RPC system",
>   "homepage": "http://thrift.apache.org/",
>   "repository": {
>     "type": "svn",
>     "url": "http://svn.apache.org/repos/asf/thrift/trunk/"
>   },
>   "version": "1.0.0-dev",
> {noformat}

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