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Posted to dev@kafka.apache.org by "Ismael Juma (JIRA)" <ji...@apache.org> on 2017/05/03 09:51:04 UTC

[jira] [Updated] (KAFKA-3754) Kafka default -Xloggc settings should include GC log rotation flags

     [ https://issues.apache.org/jira/browse/KAFKA-3754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ismael Juma updated KAFKA-3754:
-------------------------------
    Description: 
By default kafka-run-class.sh defines it's GC settings like so:

KAFKA_GC_LOG_OPTS="-Xloggc:$LOG_DIR/$GC_LOG_FILE_NAME -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps "

This has to potential to generate incredibly large log files when left unmanaged. 

Instead it should include some sort of default GC log retention policy by adding the following flags:
-XX:+UseGCLogFileRotation 
-XX:NumberOfGCLogFiles= 10
 -XX:GCLogFileSize=100M

http://www.oracle.com/technetwork/java/javase/7u2-relnotes-1394228.html details these flags and their defaults


  was:
By default kafka-run-class.sh defines it's GC settings like so:

KAFKA_GC_LOG_OPTS="-Xloggc:$LOG_DIR/$GC_LOG_FILE_NAME -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps "

This has to potential to generate incredibly large log files when left unmanaged. 

Instead it should include some sort of default GC log retention policy by adding the following flags:
-XX:+UseGCLogFileRotation 
-XX:NumberOfGCLogFiles= <number of files>
 -XX:GCLogFileSize=<size of files>

http://www.oracle.com/technetwork/java/javase/7u2-relnotes-1394228.html details these flags and their defaults



> Kafka default -Xloggc settings should include GC log rotation flags
> -------------------------------------------------------------------
>
>                 Key: KAFKA-3754
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3754
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Ryan P
>            Assignee: Ryan P
>            Priority: Minor
>
> By default kafka-run-class.sh defines it's GC settings like so:
> KAFKA_GC_LOG_OPTS="-Xloggc:$LOG_DIR/$GC_LOG_FILE_NAME -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps "
> This has to potential to generate incredibly large log files when left unmanaged. 
> Instead it should include some sort of default GC log retention policy by adding the following flags:
> -XX:+UseGCLogFileRotation 
> -XX:NumberOfGCLogFiles= 10
>  -XX:GCLogFileSize=100M
> http://www.oracle.com/technetwork/java/javase/7u2-relnotes-1394228.html details these flags and their defaults



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