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Posted to issues@spark.apache.org by "Dongjoon Hyun (JIRA)" <ji...@apache.org> on 2019/06/09 20:11:00 UTC
[jira] [Updated] (SPARK-27977) MicroBatchWriter should use
StreamWriter for human-friendly textual representation (toString)
[ https://issues.apache.org/jira/browse/SPARK-27977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dongjoon Hyun updated SPARK-27977:
----------------------------------
Affects Version/s: (was: 2.4.3)
3.0.0
> MicroBatchWriter should use StreamWriter for human-friendly textual representation (toString)
> ---------------------------------------------------------------------------------------------
>
> Key: SPARK-27977
> URL: https://issues.apache.org/jira/browse/SPARK-27977
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 3.0.0
> Reporter: Jacek Laskowski
> Priority: Minor
>
> The following is a extended explain for a streaming query:
> {code}
> == Parsed Logical Plan ==
> WriteToDataSourceV2 org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
> +- Project [value#39 AS value#0]
> +- Streaming RelationV2 socket[value#39] (Options: [host=localhost,port=8888])
> == Analyzed Logical Plan ==
> WriteToDataSourceV2 org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
> +- Project [value#39 AS value#0]
> +- Streaming RelationV2 socket[value#39] (Options: [host=localhost,port=8888])
> == Optimized Logical Plan ==
> WriteToDataSourceV2 org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
> +- Streaming RelationV2 socket[value#39] (Options: [host=localhost,port=8888])
> == Physical Plan ==
> WriteToDataSourceV2 org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
> +- *(1) Project [value#39]
> +- *(1) ScanV2 socket[value#39] (Options: [host=localhost,port=8888])
> {code}
> As you may have noticed, {{WriteToDataSourceV2}} is followed by the internal representation of {{MicroBatchWriter}} that is a mere adapter for {{StreamWriter}}, e.g. {{ConsoleWriter}}.
> It'd be more debugging-friendly if the plans included whatever {{StreamWriter.toString}} would (which in case of {{ConsoleWriter}} would be {{ConsoleWriter[numRows=..., truncate=...]}} which gives more context).
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