[jira] [Resolved] (SPARK-22805) Use aliases for StorageLevel in event logs

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-22805.
-------------------------------
    Resolution: Won't Fix

> Use aliases for StorageLevel in event logs
> ------------------------------------------
>
>                 Key: SPARK-22805
>                 URL: https://issues.apache.org/jira/browse/SPARK-22805
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.1.2, 2.2.1
>            Reporter: Sergei Lebedev
>            Priority: Minor
>
> Fact 1: {{StorageLevel}} has a private constructor, therefore a list of predefined levels is not extendable (by the users).
> Fact 2: The format of event logs uses redundant representation for storage levels 
> {code}
> >>> len('{"Use Disk": true, "Use Memory": false, "Deserialized": true, "Replication": 1}')
> 79
> >>> len('DISK_ONLY')
> 9
> {code}
> Fact 3: This leads to excessive log sizes for workloads with lots of partitions, because every partition would have the storage level field which is 60-70 bytes more than it should be.
> Suggested quick win: use the names of the predefined levels to identify them in the event log.



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