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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2677) AvroIO.read without specifying a schema
Date Mon, 24 Jul 2017 22:09:00 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099182#comment-16099182
] 

ASF GitHub Bot commented on BEAM-2677:
--------------------------------------

GitHub user jkff opened a pull request:

    https://github.com/apache/beam/pull/3632

    [BEAM-2677] AvroIO.parseGenericRecords - schemaless AvroIO.read

    To be done properly, this PR needs https://github.com/apache/beam/pull/3549.
    
    R: @mairbek CC: @reuvenlax (please take a look at the API but hold off a full review until
that PR is submitted)

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/jkff/incubator-beam avroio-dynamic

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/beam/pull/3632.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3632
    
----
commit 8bcafd94a38d9ccb962acd809536ff4bfcf70036
Author: Eugene Kirpichov <kirpichov@google.com>
Date:   2017-07-24T22:07:15Z

    [BEAM-2677] AvroIO.parseGenericRecords - schemaless AvroIO.read

----


> AvroIO.read without specifying a schema
> ---------------------------------------
>
>                 Key: BEAM-2677
>                 URL: https://issues.apache.org/jira/browse/BEAM-2677
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Eugene Kirpichov
>            Assignee: Eugene Kirpichov
>
> Sometimes it is inconvenient to require the user of AvroIO.read/readAll to specify a
Schema for the Avro files they are reading, especially if different files may have different
schemas.
> It is possible to read GenericRecord objects from an Avro file, however it is not possible
to provide a Coder for GenericRecord without knowing the schema: a GenericRecord knows its
schema so we can encode it into a byte array, but we can not decode it from a byte array without
knowing the schema (and encoding the full schema together with every record would be impractical).
> Instead, a reasonable approach is to treat schemaless GenericRecord as unencodable and
use the same approach as JdbcIO - a user-specified parse callback.
> Suggested API: AvroIO.parseGenericRecords(SerializableFunction<GenericRecord, T>
parseFn).from(filepattern).
> CC: [~mkhadikov] [~reuvenlax]



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