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Date: Fri, 5 Jun 2015 10:45:00 +0000 (UTC)
From: "Cheng Lian (JIRA)" <jira@apache.org>
To: issues@spark.apache.org
Message-ID: <JIRA.12835597.1433472056000.1240.1433501100611@Atlassian.JIRA>
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Subject: [jira] [Commented] (SPARK-8122)
 ParquetRelation.enableLogForwarding() may fail to configure loggers
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    [ https://issues.apache.org/jira/browse/SPARK-8122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14574291#comment-14574291 ] 

Cheng Lian commented on SPARK-8122:
-----------------------------------

Hm, just noticed that the logger created in the static initialization block of {{org.apache.parquet.Log}} is also a local variable.  Not quite sure about the lifetime of a local variable appeared in a static initialization block though, assuming it behaves the same as other local variable, namely it goes out of scope out of the static block.  Seems that this makes both {{ParquetRelation.enableLogForwarding()}} and Parquet itself suffer from the GC issue?

> ParquetRelation.enableLogForwarding() may fail to configure loggers
> -------------------------------------------------------------------
>
>                 Key: SPARK-8122
>                 URL: https://issues.apache.org/jira/browse/SPARK-8122
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 1.5.0
>            Reporter: Konstantin Shaposhnikov
>            Priority: Minor
>
> _enableLogForwarding()_ doesn't hold to the created loggers that can be garbage collected and all configuration changes will be gone. From https://docs.oracle.com/javase/6/docs/api/java/util/logging/Logger.html javadocs:  _It is important to note that the Logger returned by one of the getLogger factory methods may be garbage collected at any time if a strong reference to the Logger is not kept._
> All created logger references need to be kept, e.g. in static variables.


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