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From "Douglas Creager (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-984) Avro C - Resolved reader fails to read nested arrays and reads uninitialized memory
Date Tue, 20 Dec 2011 21:09:30 GMT

     [ https://issues.apache.org/jira/browse/AVRO-984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Douglas Creager updated AVRO-984:
---------------------------------

    Attachment: resolved-writer.patch
    
> Avro C - Resolved reader fails to read nested arrays and reads uninitialized memory
> -----------------------------------------------------------------------------------
>
>                 Key: AVRO-984
>                 URL: https://issues.apache.org/jira/browse/AVRO-984
>             Project: Avro
>          Issue Type: Bug
>          Components: c
>    Affects Versions: 1.6.1, 1.6.2, 1.7.0
>         Environment: GNU/Linux Ubuntu 11.10 64-bit 
>            Reporter: Vivek Nadkarni
>             Fix For: 1.6.2, 1.7.0
>
>         Attachments: avro-984-output.txt, avro-984-test.c, avro-984-valgrind-output.txt,
resolved-writer.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> Summary: 
> I created a test program that creates an avro value corresponding to
> the following schema: 
>   {"type":"array", "items": {"type": "array", "items": "long"}}
> and tries to read it back using a matched and resolved reader. The
> matched reader is able to reconstruct the avro value, but the resolved
> reader fails to read the value. 
> Additionally valgrind indicates that conditional jumps are being
> performed based on uninitialized memory, when trying to reconstruct
> the value using the resolved reader.
> More Details:
> I created a test program that creates an avro value corresponding to
> the following writer schema: 
>   {"type":"array", "items": {"type": "array", "items": "long"}}
> The avro value is serialized to memory. 
> Then this memory is read back into two readers. In both cases the
> reader schema is set to be identical to the writer schema.
> The first reader is a matched reader -- i.e. the reader knows that the
> writer and reader schema are identical. 
> The second reader is a resolved reader -- i.e. the reader tries to
> resolve differences between the writer and reader schema. The schemas
> should resolve perfectly, since the writer and reader schema are
> identical.
> When we try to deserialize the binary buffer with the matched reader,
> the value is reconstructed perfectly.
> When we try to deserialize the binary buffer with the resolved reader,
> the code fails to populate the avro value. This failure indicates that
> the resolved reading of the nested array not working
> properly. Additionally valgrind indicates that conditional jumps are
> being performed based on uninitialized values, in this second case.
> I will attach a test program that shows the issues. 

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