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https://issues.apache.org/jira/browse/SPARK-7804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14555680#comment-14555680
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Paul Wu edited comment on SPARK-7804 at 5/22/15 12:00 PM:
----------------------------------------------------------
Unfortunately, JdbcRDD was poorly designed since the lowerbound and upperbound
are long types which are too limited. One of my team members implemented a
general one based on the idea. Some of my team are worried about the home-made
solution. When we saw JDBCRDD, it looks like what we wanted. In fact, I hope
JDBCRDD can be public or JdbcRDD can be re-designed to take care general
situation just like what JDBCRDD does.
was (Author: [email protected]):
Unfortunately, JdbcRDD was poorly designed since the lowerbound and upperbound
are long types which are too limited. One of my team member implemented a
general one based on the idea. Some of my team are worried about the home-made
solution. When we saw JDBCRDD, it looks like what we wanted. In fact, I hope
JDBCRDD can be public or JdbcRDD can be re-designed to take care general
situation just like what JDBCRDD does.
> Incorrect results from JDBCRDD -- one record repeatly
> -----------------------------------------------------
>
> Key: SPARK-7804
> URL: https://issues.apache.org/jira/browse/SPARK-7804
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.3.0, 1.3.1
> Reporter: Paul Wu
>
> Getting only one record repeated in the RDD and repeated field value:
>
> I have a table like:
> {code}
> attuid name email
> 12 john [email protected]
> 23 tom [email protected]
> 34 tony [email protected]
> {code}
> My code:
> {code}
> JavaSparkContext sc = new JavaSparkContext(sparkConf);
> String url = "....";
> java.util.Properties prop = new Properties();
> List<JDBCPartition> partitionList = new ArrayList<>();
> //int i;
> partitionList.add(new JDBCPartition("1=1", 0));
>
> List<StructField> fields = new ArrayList<StructField>();
> fields.add(DataTypes.createStructField("attuid",
> DataTypes.StringType, true));
> fields.add(DataTypes.createStructField("name", DataTypes.StringType,
> true));
> fields.add(DataTypes.createStructField("email", DataTypes.StringType,
> true));
> StructType schema = DataTypes.createStructType(fields);
> JDBCRDD jdbcRDD = new JDBCRDD(sc.sc(),
> JDBCRDD.getConnector("oracle.jdbc.OracleDriver", url, prop),
>
> schema,
> " USERS",
> new String[]{"attuid", "name", "email"},
> new Filter[]{ },
>
> partitionList.toArray(new JDBCPartition[0])
>
> );
>
> System.out.println("count before to Java RDD=" +
> jdbcRDD.cache().count());
> JavaRDD<Row> jrdd = jdbcRDD.toJavaRDD();
> System.out.println("count=" + jrdd.count());
> List<Row> lr = jrdd.collect();
> for (Row r : lr) {
> for (int ii = 0; ii < r.length(); ii++) {
> System.out.println(r.getString(ii));
> }
> }
> {code}
> ===========================
> result is :
> {code}
> 34
> tony
> [email protected]
> 34
> tony
> [email protected]
> 34
> tony
> [email protected]
> {code}
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