[jira] [Assigned] (SPARK-17231) Avoid building debug or trace log messages unless the respective log level is enabled

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-17231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-17231:
------------------------------------

    Assignee:     (was: Apache Spark)

> Avoid building debug or trace log messages unless the respective log level is enabled
> -------------------------------------------------------------------------------------
>
>                 Key: SPARK-17231
>                 URL: https://issues.apache.org/jira/browse/SPARK-17231
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.0.0
>         Environment: Spark cluster with 8 r3.8xl EC2 worker instances
>            Reporter: Michael Allman
>            Priority: Minor
>         Attachments: logging_perf_improvements 2.jpg, logging_perf_improvements.jpg, master 2.jpg, master.jpg
>
>
> While debugging the performance of a large GraphX connected components computation, I found several places in the {{network-common}} and {{network-shuffle}} code bases where trace or debug log messages are constructed even if the respective log level is disabled. Refactoring the respective code to avoid these constructions except where necessary led to a modest but measurable reduction in task time, GC time and the ratio thereof.



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