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Posted to dev@avro.apache.org by "Anders Sundelin (JIRA)" <ji...@apache.org> on 2017/09/10 20:05:00 UTC

[jira] [Updated] (AVRO-2075) Allow SchemaCompatibility to report possibly lossy conversions

     [ https://issues.apache.org/jira/browse/AVRO-2075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anders Sundelin updated AVRO-2075:
----------------------------------
    Attachment: 0001-AVRO-2075-Add-option-to-report-possible-data-loss-in.patch

> Allow SchemaCompatibility to report possibly lossy conversions
> --------------------------------------------------------------
>
>                 Key: AVRO-2075
>                 URL: https://issues.apache.org/jira/browse/AVRO-2075
>             Project: Avro
>          Issue Type: Improvement
>    Affects Versions: 1.7.7, 1.8.2
>         Environment: Java
>            Reporter: Anders Sundelin
>            Priority: Minor
>         Attachments: 0001-AVRO-2075-Add-option-to-report-possible-data-loss-in.patch
>
>
> It is stated in the Avro spec that int and long values are promotable to floats and doubles.
> However, numeric promotions to floats are lossy (losing precision), as is long promotion to double.
> It is suggested that the SchemaCompatibility class is updated to be able to flag conversions that have the possibility to be lossy as errors. The attached patch does just that, by adding a new boolean flag (allowDataLoss), preserving backwards compatibility by defaulting this flag to true.
> Testcases illustrating the problem has been added to the unit test class TestReadingWritingDataInEvolvedSchemas



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