DataFrame saveAsTable正确保存所有列值,但insertInto函数不存储所有列,尤其是json数据被截断,后续列未存储的hive表。
我们的环境
样本数据是
a8f11f90-20c9-11e8-b93e-2fc569d27605 efe5bdb3-baac-5d8e-6cae57771c13 Unknown E657F298-2D96-4C7D-8516-E228153FE010 NonDemarcated {"org-id":"efe5bdb3-baac-5d8e-6cae57771c13","nodeid":"N02c00056","parkingzoneid":"E657F298-2D96-4C7D-8516-E228153FE010","site-id":"a8f11f90-20c9-11e8-b93e-2fc569d27605","channel":1,"type":"Park","active":true,"tag":"","configured_date":"2017-10-23
23:29:11.20","vs":[5.0,1.7999999523162842,1.5]}
DF SaveAsTable
val spark = SparkSession.builder().appName("Spark SQL Test").
config("hive.exec.dynamic.partition", "true").
config("hive.exec.dynamic.partition.mode", "nonstrict").
enableHiveSupport().getOrCreate()
val zoneStatus = spark.table("zone_status")
zoneStatus.select(col("site-id"),col("org-id"), col("groupid"), col("zid"), col("type"), lit(0), col("config"), unix_timestamp().alias("ts")).
write.mode(SaveMode.Overwrite).saveAsTable("dwh_zone_status")
在结果表中正确存储数据:
a8f11f90-20c9-11e8-b93e-2fc569d27605 efe5bdb3-baac-5d8e-6cae57771c13 Unknown E657F298-2D96-4C7D-8516-E228153FE010 NonDemarcated 0 {"org-id":"efe5bdb3-baac-5d8e-6cae57771c13","nodeid":"N02c00056","parkingzoneid":"E657F298-2D96-4C7D-8516-E228153FE010","site-id":"a8f11f90-20c9-11e8-b93e-2fc569d27605","channel":1,"type":"Park","active":true,"tag":"","configured_date":"2017-10-23 23:29:11.20","vs":[5.0,1.7999999523162842,1.5]} 1520453589
DF insertInto
zoneStatus.
select(col("site-id"),col("org-id"), col("groupid"), col("zid"), col("type"), lit(0), col("config"), unix_timestamp().alias("ts")).
write.mode(SaveMode.Overwrite).insertInto("zone_status_insert")
但是insertInto并不是持久化所有内容。 json字符串存储部分,后续列不存储。
a8f11f90-20c9-11e8-b93e-2fc569d27605 efe5bdb3-baac-5d8e-6cae57771c13 Unknown E657F298-2D96-4C7D-8516-E228153FE010 NonDemarcated 0 {"org-id":"efe5bdb3-baac-5d8e-6cae57771c13" NULL
我们在项目中使用insertInto函数,最近在解析json数据时会遇到其他指标。我们注意到配置内容未完全存储。计划更改为saveAsTable但我们可以避免代码更改,如果可以在spark配置中添加任何可用的解决方法。
答案 0 :(得分:0)
您可以使用以下替代方法将数据插入表格。
val zoneStatusDF = zoneStatus.
select(col("site-id"),col("org-id"), col("groupid"), col("zid"), col("type"), lit(0), col("config"), unix_timestamp().alias("ts"))
zoneStatusDF.registerTempTable("zone_status_insert ")
或者
zoneStatus.sqlContext.sql("create table zone_status_insert as select * from zone_status")
答案 1 :(得分:0)
原因是使用
创建了架构ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' STORED AS TEXTFILE
删除 ROW FORMAT DIIMITED FIELDS TERMINATED BY'' 可以使用insertInto保存整个内容。