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问题描述
限时送ChatGPT账号..我使用的是使用 hadoop-2.6.5.jar 版本的 spark-sql-2.4.1v.我需要先将数据保存在 hdfs 上,然后再转移到 cassandra.因此,我试图将数据保存在 hdfs 上,如下所示:
I am using spark-sql-2.4.1v which is using hadoop-2.6.5.jar version . I need to save my data first on hdfs and move to cassandra later. Hence I am trying to save the data on hdfs as below:
String hdfsPath = "/user/order_items/";
cleanedDs.createTempViewOrTable("source_tab");
givenItemList.parallelStream().forEach( item -> {
String query = "select $item as itemCol , avg($item) as mean groupBy year";
Dataset<Row> resultDs = sparkSession.sql(query);
saveDsToHdfs(hdfsPath, resultDs );
});
public static void saveDsToHdfs(String parquet_file, Dataset<Row> df) {
df.write()
.format("parquet")
.mode("append")
.save(parquet_file);
logger.info(" Saved parquet file : " + parquet_file + "successfully");
}
当我在集群上运行我的工作时,它无法抛出此错误:
When I run my job on cluster it fails throwing this error:
java.io.IOException: Failed to rename FileStatus{path=hdfs:/user/order_items/_temporary/0/_temporary/attempt_20180626192453_0003_m_000007_59/part-00007.parquet; isDirectory=false; length=952309; replication=1; blocksize=67108864; modification_time=1530041098000; access_time=0; owner=; group=; permission=rw-rw-rw-; isSymlink=false} to hdfs:/user/order_items/part-00007.parquet
at org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.mergePaths(FileOutputCommitter.java:415)
请建议如何解决这个问题?
Please suggest how to fix this issue?
推荐答案
您可以在一个作业中完成所有选择,在一个表中获取所有选择和联合.
You can do all the selects in one single job, get all the selects and union in a single table.
Dataset<Row> resultDs = givenItemList.parallelStream().map( item -> {
String query = "select $item as itemCol , avg($item) as mean groupBy year";
return sparkSession.sql(query);
}).reduce((a, b) -> a.union(b)).get
saveDsToHdfs(hdfsPath, resultDs );
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