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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-2475) [stargate] Required ordering of JSON name/value pairs when performing Insert/Update
Date Sun, 03 Jun 2012 21:14:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13288259#comment-13288259
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Andrew Purtell edited comment on HBASE-2475 at 6/3/12 9:14 PM:
---------------------------------------------------------------

If the "$" value field does not come last in a CellModel, Jersey won't deserialize the model
correctly. We can

1. Document this clearly and also add a troubleshooting section entry.

2. Replace the current JSON representation support (o.a.h.hbase.rest.provider.JAXBContextResolver)
with an alternative that is backwards compatible. Elsewhere we use Jackson as a JSON serializer
and it is better behaved. JacksonJsonProvider in jackson-jaxrs is a drop in replacement for
Jersey's JSON provider. However, the JSON representation of HBase REST will change as a consequence.
                
      was (Author: apurtell):
    If the "$" value field does not come last in a CellModel, Jersey won't deserialize the
model correctly. We can

1. Document this clearly and also add a troubleshooting section entry.

2. Replace the current JSON representation support (o.a.h.hbase.rest.provider.JAXBContextResolver)
with an alternative that is backwards compatible.
                  
> [stargate] Required ordering of JSON name/value pairs when performing Insert/Update
> -----------------------------------------------------------------------------------
>
>                 Key: HBASE-2475
>                 URL: https://issues.apache.org/jira/browse/HBASE-2475
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>              Labels: moved_from_0_20_5
>             Fix For: 0.20.5, 0.90.0
>
>
> From Tyler Coffin up on hbase-user@
> {quote}
> I am using the Stargate REST interface to HBase for inserting data. When using JSON to
transmit the query content, I have found that specific ordering of key/value pairs within
the JSON string is required in order for the query to succeed (otherwise a response of 'HTTP/1.1
500 Row key is invalid' error is thrown if "key" and "Cell" are reversed).
> Example:
> This string receives the above error:
> {noformat}
> {"Row":[{"Cell":[{"column":"bWVzc2FnZTptc2c=","$":"Zm9vYmFy"}],"key":"MTIzNAo="}]}
> {noformat}
> This is the valid equivalent string:
> {noformat}
> {"Row":[{"key":"MTIzNAo=","Cell":[{"column":"bWVzc2FnZTptc2c=","$":"Zm9vYmFy"}]}]}
> {noformat}
> As you can see the only difference between these two instances is that the "key" and
"Cell" name/value pairs have their order reversed.
> In the equivalent XML notation, the ordering is specifically required per the schema.
However with JSON Objects (i.e. name/value pairs) order is not required (JSON Arrays are ordered,
but not Objects). Some JSON libraries will preserve ordering of Objects but not all  which
is how I discovered this problem in the first place because I was using the Perl JSON library
which does not guarantee order). 
> I'm unsure if this is a bug in the REST implementation or an inconvenient ambiguity in
the JSON specification. Regardless I thought I'd share this discovery with the community for
feedback (or at the very least to document this for users' future reference).
> For reference this is the table schema for the above query:
> {noformat}
> {NAME => 'reftrack', FAMILIES => [{NAME => 'message', COMPRESSION =>
> 'NONE', VERSIONS => '1', TTL => '2147483647', BLOCKSIZE => '65536',
> IN_MEMORY => 'false', BLOCKCACHE => 'true'}]}
> {noformat}
> {quote}

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