[jira] [Commented] (AVRO-3194) [C++] Parsing avro file using `GenericDatum` results in segmentation fault

["Thiruvalluvan M. G. (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-3194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17408485#comment-17408485 ] 

Thiruvalluvan M. G. commented on AVRO-3194:
-------------------------------------------

[~OscarTHZhang] Is it possible to attach the offending schema to this ticket? Thank you

> [C++] Parsing avro file using `GenericDatum` results in segmentation fault
> --------------------------------------------------------------------------
>
>                 Key: AVRO-3194
>                 URL: https://issues.apache.org/jira/browse/AVRO-3194
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: c++
>         Environment: Ubuntu on AWS EC2
>            Reporter: Oscar Zhang
>            Priority: Major
>
> Hello,
> I wonder what's the correct example of parsing an avro input stream into a vector of `GenericRecord`?
> I am trying to parse .avro file using `GenericDatum` to store them in a vector of `GenericRecord`, but I got a segmentation fault (signal 11) when I am trying to call `datum.value()`. Here is the sample code that I am writing:
> {code:java}
> std::unique_ptr<avro::InputStream> avroInputStream  = avro::istreamInputStream(retrievedFile); // `retrievedFile` is a basic_iostream from AWS S3
> // get the schema file
> std::stringstream schemaInput(schemaName);
> avro::ValidSchema validSchema;
> avro::compileJsonSchema(schemaInput, validSchema);
> // read the data input stream with the given valid schema
> avro::DataFileReader<avro::GenericDatum> fileReader(move(avroInputStream));
> avro::GenericDatum datum(fileReader.dataSchema());
> std::vector<avro::GenericRecord> recordArray;
> while (fileReader.read(datum)) {
>     if (datum.type() == avro::AVRO_RECORD) {
>         std::cout << "[Check 1]" << std::endl;
>         const avro::GenericRecord record = datum.value<avro::GenericRecord>(); // result in segmentation fault
>         std::cout << "[Check 2]" << std::endl;
>         recordArray.push_back(record);
>     }
> }
> // processing the recordArray further
> ...{code}



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