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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6864) Remove confusing "invalid POJO type" messages from TypeExtractor
Date Tue, 28 Nov 2017 21:31:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269491#comment-16269491
] 

ASF GitHub Bot commented on FLINK-6864:
---------------------------------------

Github user greghogan commented on the issue:

    https://github.com/apache/flink/pull/4574
  
    @zjureel am merging this ... thanks for the PR and edits!


> Remove confusing "invalid POJO type" messages from TypeExtractor
> ----------------------------------------------------------------
>
>                 Key: FLINK-6864
>                 URL: https://issues.apache.org/jira/browse/FLINK-6864
>             Project: Flink
>          Issue Type: Improvement
>          Components: Documentation, Type Serialization System
>            Reporter: Tzu-Li (Gordon) Tai
>            Assignee: Fang Yong
>             Fix For: 1.5.0
>
>
> When a user's type cannot be treated as a POJO, the {{TypeExtractor}} will log warnings
such as ".. must have a default constructor to be used as a POJO.", "  ... is not a valid
POJO type because not all fields are valid POJO fields." in the {{analyzePojo}} method.
> These messages are often conceived as misleading for the user to think that the job should
have failed, whereas in fact in these cases Flink just fallsback to Kryo and treat then as
generic types. We should remove these messages, and at the same time improve the type serialization
docs at [1] to explicitly inform what it means when Flink does / does not recognizes a user
type as a POJO.
> [1] https://ci.apache.org/projects/flink/flink-docs-release-1.3/dev/types_serialization.html#rules-for-pojo-types



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