Spark Scala Cassandra connector delete all all rows is faili

Question

Create table -

CREATE TABLE test.word_groups (group text, word text, count int,PRIMARY KEY (group,word));

插入数据-

INSERT INTO test.word_groups (group , word , count ) VALUES ( 'A-group', 'raj', 0) ;
INSERT INTO test.word_groups (group , word , count ) VALUES ( 'b-group', 'jaj', 0) ;
INSERT INTO test.word_groups (group , word , count ) VALUES ( 'A-group', 'raff', 3) ;
SELECT * FROM word_groups ;
group   | word | count
---------+------+-------
b-group |  jaj |     0
A-group | raff |     3
A-group |  raj |     0

脚本——

val cassandraUrl = "org.apache.spark.sql.cassandra"
val wordGroup: Map[String, String] = Map("table" ->"word_groups", 
"keyspace" -> "test", "cluster" -> "test-cluster")
val groupData = {spark.read.format(cassandraUrl).options(wordGroup).load()
.where(col("group") === "b-group")}
groupData.rdd.deleteFromCassandra("sunbird_courses", "word_groups")

——异常

java.lang.IllegalArgumentException: requirement failed: Invalid row size: 3 instead of 2.
at scala.Predef$.require(Predef.scala:224)
at com.datastax.spark.connector.writer.SqlRowWriter.readColumnValues(SqlRowWriter.scala:23)
at com.datastax.spark.connector.writer.SqlRowWriter.readColumnValues(SqlRowWriter.scala:12)
at com.datastax.spark.connector.writer.BoundStatementBuilder.bind(BoundStatementBuilder.scala:102)
at com.datastax.spark.connector.writer.GroupingBatchBuilder.next(GroupingBatchBuilder.scala:105)
at com.datastax.spark.connector.writer.GroupingBatchBuilder.next(GroupingBatchBuilder.scala:30)
at scala.collection.Iterator$class.foreach(Iterator.scala:891)
at com.datastax.spark.connector.writer.GroupingBatchBuilder.foreach(GroupingBatchBuilder.scala:30)
at com.datastax.spark.connector.writer.TableWriter$$anonfun$writeInternal$1.apply(TableWriter.scala:229)
at com.datastax.spark.connector.writer.TableWriter$$anonfun$writeInternal$1.apply(TableWriter.scala:198)
at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$withSessionDo$1.apply(CassandraConnector.scala:112)
at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$withSessionDo$1.apply(CassandraConnector.scala:111)
at com.datastax.spark.connector.cql.CassandraConnector.closeResourceAfterUse(CassandraConnector.scala:129)
at com.datastax.spark.connector.cql.CassandraConnector.withSessionDo(CassandraConnector.scala:111)
at com.datastax.spark.connector.writer.TableWriter.writeInternal(TableWriter.scala:198)
at com.datastax.spark.connector.writer.TableWriter.delete(TableWriter.scala:194)
at com.datastax.spark.connector.RDDFunctions$$anonfun$deleteFromCassandra$1.apply(RDDFunctions.scala:119)
at com.datastax.spark.connector.RDDFunctions$$anonfun$deleteFromCassandra$1.apply(RDDFunctions.scala:119)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:90)
at org.apache.spark.scheduler.Task.run(Task.scala:123)
at org.apache.spark.executor.Executor$TaskRunner$$anonfun$10.apply(Executor.scala:408)
at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1360)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:414)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
21/08/11 09:01:24 WARN TaskSetManager: Lost task 0.0 in stage 11.0 (TID 2953, localhost, executor driver): java.lang.IllegalArgumentException: requirement failed: Invalid row size: 3 instead of 2.

Spark版本- 2.4.4和Spark Cassandra Connector version - 2.5.0

Spark Cassandra连接器文档链接- https://github.com/datastax/spark-cassandra-connector/blob/master/doc/5_saving.md#deleting-rows-and-columns

我正在尝试删除这些列的所有记录，包括主键。

是否有解决方法?

供参考-我需要删除组"a -group"的所有记录从word_groups表中，包括主键/分区键

Answer 1

这是2.5中一个有趣的变化。x，我没有意识到-你现在需要有一个正确的行大小，即使keyColumns被指定，它以前没有它工作-对我来说看起来像一个bug。

删除整行时只需要保留主键-将delete更改为:

groupData.select("group", "word").rdd.deleteFromCassandra("test", "word_groups")

但是在您的情况下，根据分区键列进行删除甚至更好——在这种情况下，您将只有一个墓碑(您仍然需要选择必要的列):

import com.datastax.spark.connector._
{groupData.select("group").rdd
.deleteFromCassandra("test", "word_groups", keyColumns = SomeColumns("group"))}

你甚至不需要从Cassandra读取输入数据-如果你知道分区键的值，那么你可以直接创建RDD &删除数据(类似于文档中所示):

case class Key (group:String)
{ sc.parallelize(Seq(Key("b-group")))
.deleteFromCassandra("test", "word_groups", keyColumns = SomeColumns("group"))}