[jira] [Commented] (PARQUET-369) Shading SLF4J prevents SLF4J locating org.slf4j.impl.StaticLoggerBinder

["Jay Goldman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052280#comment-16052280 ] 

Jay Goldman commented on PARQUET-369:
-------------------------------------

I am still seeing this problem using the latest Spark (2.1.0).
So is this issue really resolved, or just understood?
i.e., how do you read/write parquet files without getting these messages?

> Shading SLF4J prevents SLF4J locating org.slf4j.impl.StaticLoggerBinder
> -----------------------------------------------------------------------
>
>                 Key: PARQUET-369
>                 URL: https://issues.apache.org/jira/browse/PARQUET-369
>             Project: Parquet
>          Issue Type: Bug
>          Components: parquet-format
>            Reporter: Cheng Lian
>            Assignee: Ryan Blue
>             Fix For: format-2.3.1
>
>
> Parquet-format shades SLF4J to {{parquet.org.slf4j}} (see [here|https://github.com/apache/parquet-format/blob/apache-parquet-format-2.3.0/pom.xml#L162]). This also accidentally shades [this line|https://github.com/qos-ch/slf4j/blob/v_1.7.2/slf4j-api/src/main/java/org/slf4j/LoggerFactory.java#L207]
> {code}
> private static String STATIC_LOGGER_BINDER_PATH = "org/slf4j/impl/StaticLoggerBinder.class";
> {code}
> to
> {code}
> private static String STATIC_LOGGER_BINDER_PATH = "parquet/org/slf4j/impl/StaticLoggerBinder.class";
> {code}
> and thus {{LoggerFactory}} can never find the correct {{StaticLoggerBinder}} implementation even if we provide dependencies like {{slf4j-log4j12}} on the classpath.
> This happens in Spark. Whenever we write a Parquet file, we see the following famous message and can never get rid of it:
> {noformat}
> SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
> SLF4J: Defaulting to no-operation (NOP) logger implementation
> SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
> {noformat}



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