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我已将一个文件加载到我的配置单元表中，该文件是 ORC 文件格式。
当我尝试使用读取文件时 

 hadoop fs -text /apps/hive/warehouse/emp_rcfileformat/000000_0

或者 

hive --orcfiledump /apps/hive/warehouse/emp_rcfileformat/000000_0

这没有给我任何结果......我使用的是 hive 0.14

如果我使用 orcfiledump 会出错 

Exception in thread "main" org.apache.hadoop.hive.ql.io.FileFormatException: Malformed ORC file /apps/hive/warehouse/emp_rcfileformat/000000_0. Invalid postscript.
        at org.apache.hadoop.hive.ql.io.orc.ReaderImpl.ensureOrcFooter(ReaderImpl.java:248)
        at org.apache.hadoop.hive.ql.io.orc.ReaderImpl.extractMetaInfoFromFooter(ReaderImpl.java:373)
        at org.apache.hadoop.hive.ql.io.orc.ReaderImpl.<init>(ReaderImpl.java:314)
        at org.apache.hadoop.hive.ql.io.orc.OrcFile.createReader(OrcFile.java:237)
        at org.apache.hadoop.hive.ql.io.orc.FileDump.printMetaData(FileDump.java:101)
        at org.apache.hadoop.hive.ql.io.orc.FileDump.main(FileDump.java:86)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
4

2 回答 2

2

Hive提供了一个rcfilecat工具来显示RCFiles的内容：

$ bin/hive --service rcfilecat /user/hive/warehouse/columntable/000000_0

ORC 文件转储实用程序：

The ORC file dump utility analyzes ORC files.  To invoke it, use this command:

// Hive version 0.11 through 0.14:
hive --orcfiledump <location-of-orc-file>

// Hive version 0.15 and later:
hive --orcfiledump [-d] [--rowindex <col_ids>] <location-of-orc-file>

// Hive version 1.2.0 and later:
hive --orcfiledump [-d] [-t] [--rowindex <col_ids>] <location-of-orc-file>

// Hive version 1.3.0 and later:
hive --orcfiledump [-j] [-p] [-d] [-t] [--rowindex <col_ids>] <location-of-orc-file>

Adding -d to the command will cause it to dump the data in the ORC file rather than the metadata (Hive 1.1.0 and later).

Adding --rowindex with a comma separated list of column ids will cause it to print row indexes for the specified columns, where 0 is the top level struct containing all of the columns and 1 is the first column id (Hive 1.1.0 and later).

Adding -t to the command will print the timezone id of the writer.

Adding -j to the command will print the ORC file metadata in JSON format. To pretty print the JSON metadata add -p to the command.

<location-of-orc-file> is the URI of the ORC file. From Hive 1.3.0 onward, this URI can be a directory containing ORC files.

参考：ORCFileDumpUtility

于 2015-10-13T11:12:53.717 回答
0

Orcfile 与 Rcfile 不同。请确保您的阅读器与文件格式匹配。

于 2015-10-13T13:55:46.680 回答