orc

问题 I have searched through every documentation and still didn't find why there is a prefix and what is c000 in the below file naming convention: file:/Users/stephen/p/spark/f1/part-00000-445036f9-7a40-4333-8405-8451faa44319- c000.snappy.parquet 回答1: You should use "Talk is cheap, show me the code." methodology. Everything is not documented and one way to go is just the code. Consider part-1-2_3-4.parquet : Split/Partition number. Random UUID to prevent collision between different (appending)

问题 I have searched through every documentation and still didn't find why there is a prefix and what is c000 in the below file naming convention: file:/Users/stephen/p/spark/f1/part-00000-445036f9-7a40-4333-8405-8451faa44319- c000.snappy.parquet 回答1: You should use "Talk is cheap, show me the code." methodology. Everything is not documented and one way to go is just the code. Consider part-1-2_3-4.parquet : Split/Partition number. Random UUID to prevent collision between different (appending)

问题 I was able to run query in presto to read the non-float columns from Hive ORC(snappy) table. However, when I select all float datatype columns through the presto cli, gives me the below error message. Any suggestions what is the alternative other than changing the filed type to double in the targetHive table presto:sample> select * from emp_detail; Query 20200107_112537_00009_2zpay failed: Error opening Hive split hdfs://ip_address/warehouse/tablespace/managed/hive/sample.db/emp_detail/part

问题 I was able to run query in presto to read the non-float columns from Hive ORC(snappy) table. However, when I select all float datatype columns through the presto cli, gives me the below error message. Any suggestions what is the alternative other than changing the filed type to double in the targetHive table presto:sample> select * from emp_detail; Query 20200107_112537_00009_2zpay failed: Error opening Hive split hdfs://ip_address/warehouse/tablespace/managed/hive/sample.db/emp_detail/part

来源： https://stackoverflow.com/questions/56593175/is-there-a-way-to-merge-orc-files-in-hdfs-without-using-alter-table-concatenate

来源： https://stackoverflow.com/questions/56593175/is-there-a-way-to-merge-orc-files-in-hdfs-without-using-alter-table-concatenate

来源： https://stackoverflow.com/questions/56593175/is-there-a-way-to-merge-orc-files-in-hdfs-without-using-alter-table-concatenate

问题 How to load text file into Hive orc external table? create table MyDB.TEST ( Col1 String, Col2 String, Col3 String, Col4 String) STORED AS INPUTFORMAT 'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat' OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat'; I have already created above table as Orc. but while fetching data from table it show below error Failed with exception java.io.IOException:org.apache.orc.FileFormatException: Malformed ORC file hdfs://localhost:9000/Ext/sqooporc

问题 I have saved json dataframe in Hive using orc format jsonDF.write.format("orc").saveAsTable(hiveExamples.jsonTest) Now I need to display the file as a normal text on HDFS. Is there away to do this? I have used hdfs dfs -text /path-of-table , but it displays the data in ORC format. 回答1: From the linux shell command there is an utility called "hive --orcfiledump" To see the metadata of an ORC file in HDFS you can invoke the command like: [@localhost ~ ]$ hive --orcfiledump <path to HDFS ORC

问题 I have saved json dataframe in Hive using orc format jsonDF.write.format("orc").saveAsTable(hiveExamples.jsonTest) Now I need to display the file as a normal text on HDFS. Is there away to do this? I have used hdfs dfs -text /path-of-table , but it displays the data in ORC format. 回答1: From the linux shell command there is an utility called "hive --orcfiledump" To see the metadata of an ORC file in HDFS you can invoke the command like: [@localhost ~ ]$ hive --orcfiledump <path to HDFS ORC