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https://issues.apache.org/jira/browse/SPARK-22805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292742#comment-16292742
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Sean Owen commented on SPARK-22805:
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The current format is somewhat more flexible but yes it's verbose.
How much difference does it make in practice?
The problem with changing it is backwards compatibility.
> 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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