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From "Matt Hackett (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-333) Add TFileTransport deserializer
Date Wed, 14 Apr 2010 16:48:49 GMT

    [ https://issues.apache.org/jira/browse/HIVE-333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856956#action_12856956
] 

Matt Hackett commented on HIVE-333:
-----------------------------------

II am curious about the status of this feature request -- it looks like it did not make it
into the codebase, though to me and others I imagine it would be extremely useful. 

The ability to move Thrift object stores in TFileTransport format into more Hive/Hadoop-friendly
SequenceFiles would seem to complete the loop for a common use case: namely, logging data
to the ThriftFile store in Scribe. From what I gather, this is what is also done internally
at Facebook.

Apologies in advance if this has already been superseded by other changes or discussions.

> Add TFileTransport deserializer
> -------------------------------
>
>                 Key: HIVE-333
>                 URL: https://issues.apache.org/jira/browse/HIVE-333
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Serializers/Deserializers
>         Environment: Linux
>            Reporter: Steve Corona
>            Assignee: Joydeep Sen Sarma
>         Attachments: hive-333.patch.1, hive-333.patch.2, libthrift_asf.jar
>
>
> I've been googling around all night and havn't really found what I am looking for. Basically,
I want to transfer some data from my web servers to hive  in a format that's a little more
verbose than plain CSV files. It seems like JSON or thrift would be perfect for this. I am
planning on sending this serialized json or thrift data through scribe and loading it into
Hive.. I just can't figure out how to tell hive that the input data is a bunch of serialized
thrift records (all of the records are the "struct" type)  in a TFileTransport. Hopefully
this makes sense...
> Reply from Joydeep Sen Sarma (jssarma@facebook.com)
> Unfortunately the open source code base does not have the loaders we run to convert thrift
records in a tfiletransport into a sequencefile that hadoop/hive can work with. One option
is that we add this to Hive code base (should be straightforward).
> No process required. Please file a jira - I will try to upload a patch this weekend (just
cut'n'paste for most part). Would appreciate some help in finessing it out .. (the internal
code is hardwired to some assumptions etc. )

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