publicclassReadSpecificColumnsTest{publicstaticvoidmain(String[]args)throwsIOException{Configurationconfiguration=newConfiguration();intselectNum=1;//只读第一列StringschemaName="spark_schema";StringfilePath="hdfs:/
Apache Parquet是一个流行的Parquet文件处理库,而Apache Commons CSV是一个Java库,用于读写CSV文件。我们可以使用Parquet库读取Parquet文件的内容,并使用CSV库将数据写入CSV文件。以下是示例代码: importorg.apache.parquet.avro.AvroParquetReader;importorg.apache.parquet.hadoop.ParquetReader;importorg.apache.parquet.had...
Now that we have added the dependency, we can start writing code to read and write Parquet files. Here is an example of how to create a Parquet file with some sample data: importorg.apache.parquet.hadoop.ParquetWriter;importorg.apache.parquet.example.data.Group;importorg.apache.parquet.example...
Example 1: to archive two class files into an archive called classes.jar: jar cvf classes.jar Foo.class Bar.class Example 2: use an existing manifest file 'mymanifest' and archive all the files in the foo/ directory into 'classes.jar': jar cvfm classes.jar mymanifest -C foo/ .2...
README License Parquet Java (formerly Parquet MR) This repository contains a Java implementation of Apache Parquet Apache Parquet is an open source, column-oriented data file format designed for efficient data storage and retrieval. It provides high performance compression and encoding schemes to hand...
Breadcrumbs parquet-java / CHANGES.mdTop File metadata and controls Preview Code Blame 1213 lines (1052 loc) · 108 KB Raw Parquet Version 1.14.1 Release Notes - Parquet - Version 1.14.1 Bug PARQUET-2468 - ParquetMetadata.toPrettyJSON throws exception on file read when LOG.isDebugEnabled() ...
java.io.EOFException is thrown when the end of the file or stream is unexpectedly reached in the input program. This exception is primarily used by data input streams to indicate that the end of the stream has been reached. It seems like there is something wrong with the Parquet files, and...
Could not read footer: java.io.IOException: Could not read footer for file FileStatus{path=cibil_risk_1007_fw_fn_cc_20210731mis.parquet; isDirectory=false; length=84932951248; replication=-1; blocksize=2147483647; modification_time=0; access_time=0; owner=; group=; permission=rw-rw...
问PySpark: py4j.protocol.Py4JJavaError:调用o215.save时出错EN我正在尝试为Pyspark中的Kmeans模型创建并...
bytecode-viewer - Java 8 Jar & Android APK reverse engineering suite. (GPL-3.0-only) Byteman - Manipulate bytecode at runtime via DSL (rules); mainly for testing/troubleshooting. (LGPL-2.1-or-later) cglib - Bytecode generation library. Javassist - Tries to simplify bytecode editing. Mixin...