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Posted to issues@spark.apache.org by "Takeshi Yamamuro (Jira)" <ji...@apache.org> on 2020/08/19 08:24:00 UTC
[jira] [Resolved] (SPARK-32632) Bad partitioning in spark jdbc
method with parameter lowerBound and upperBound
[ https://issues.apache.org/jira/browse/SPARK-32632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Takeshi Yamamuro resolved SPARK-32632.
--------------------------------------
Resolution: Invalid
> Bad partitioning in spark jdbc method with parameter lowerBound and upperBound
> ------------------------------------------------------------------------------
>
> Key: SPARK-32632
> URL: https://issues.apache.org/jira/browse/SPARK-32632
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Liu Dinghua
> Priority: Major
>
> When I use the jdbc methed
> {code:java}
> def jdbc( url: String, table: String, columnName: String, lowerBound: Long, upperBound: Long, numPartitions: Int, connectionProperties: Properties)
> {code}
>
> I am confused by the partitions generated by this method, for rows of the first partition aren't limited by the lowerBound and the ones of the last partition are not limited by the upperBound.
>
> For example, I use the method as follow:
>
> {code:java}
> val data = spark.read.jdbc(url, table, "id", 2, 5, 3,buildProperties()) .selectExpr("id","appkey","funnel_name")
> data.show(100, false)
> {code}
>
> The result partitions info is :
> 20/08/05 16:58:59 INFO JDBCRelation: Number of partitions: 3, WHERE clauses of these partitions: `id` < 3 or `id` is null, `id` >= 3 AND `id` < 4, `id` >= 4
> The returned data is:
> ||id|| appkey||funnel_name||
> |0|yanshi|test001|
> |1|yanshi|test002|
> |2|yanshi|test003|
> |3|xingkong|test_funnel|
> |4|xingkong|test_funnel2|
> |5|xingkong|test_funnel3|
> |6|donews|test_funnel4|
> |7|donews|test_funnel|
> |8|donews|test_funnel2|
> |9|dami|test_funnel3|
> |13|dami|test_funnel4|
> |15|xiaoai|test_funnel6|
>
> Normally, the clause of the first partition should be " `id` >=2 and `id` < 3 " because the lowerBound is 2, and the clause of the last partition should be " `id` >= 4 and `id` < 5 ", but the facts are not.
>
>
>
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