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  1. Spark
  2. SPARK-21579

dropTempView has a critical BUG

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Critical
    • Resolution: Not A Problem
    • Affects Version/s: 2.1.1, 2.2.0
    • Fix Version/s: None
    • Component/s: SQL
    • Labels:
      None
    • Flags:
      Important

      Description

      when I dropTempView dwd_table1 only, sub table dwd_table2 also disappear from http://127.0.0.1:4040/storage/.
      It affect version 2.1.1 and 2.2.0, 2.1.0 is ok for this problem.

      val spark = SparkSession.builder.master("local").appName("sparkTest").getOrCreate()
      val rows = Seq(Row("p1", 30), Row("p2", 20), Row("p3", 25), Row("p4", 10), Row("p5", 40), Row("p6", 15))
      val schema = new StructType().add(StructField("name", StringType)).add(StructField("age", IntegerType))
      
      val rowRDD = spark.sparkContext.parallelize(rows, 3)
      val df = spark.createDataFrame(rowRDD, schema)
      df.createOrReplaceTempView("ods_table")
      spark.sql("cache table ods_table")
      
      spark.sql("cache table dwd_table1 as select * from ods_table where age>=25")
      spark.sql("cache table dwd_table2 as select * from dwd_table1 where name='p1'")
      spark.catalog.dropTempView("dwd_table1")
      //spark.catalog.dropTempView("ods_table")
      
      spark.sql("select * from dwd_table2").show()
      

      It will keep ods_table1 in memory, although it will not been used anymore. It waste memory, especially when my service diagram much more complex

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              • Assignee:
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                Reporter:
                ant_nebula ant_nebula
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                • Created:
                  Updated:
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