lzo

问题 I'm currently working on a 3rd year project involving data from Twitter. The department have provided me with .lzo's of a months worth of Twitter. The smallest is 4.9gb and when decompressed is 29gb so I'm trying to open the file and read as I'm going. Is this possible or do I need to decompress and work with the data that way? EDIT: Have attempted to read it line by line and decompress the read line UPDATE: Found a solution - reading the STDOUT of lzop -dc works like a charm 回答1: How about

问题 I have some data in tsv format compressed using lzo. Now, I would like to use these data in a java spark program. At the moment, I am able to decompress the files and then import them in Java as text files using SparkSession spark = SparkSession.builder() .master("local[2]") .appName("MyName") .getOrCreate(); Dataset<Row> input = spark.read() .option("sep", "\t") .csv(args[0]); input.show(5); // visually check if data were imported correctly where I have passed the path to the decompressed

问题 I am looking for the fastest way to read a sequential file from disk. I read in some posts that if I compressed the file using, for example, lz4, I could achieve better performance than read the flat file, because I will minimize the i/o operations. But when I try this approach, scanning a lz4 compressed file gives me a poor performance than scanning the flat file. I didn't try the lz4demo above, but looking for it, my code is very similar. I have found this benchmarks: http://skipperkongen

问题 [Update] I've since compiled successfully and anyone else chasing these binaries can download from here I'm compiling version 2.06 of lzo by issuing the following command from the Visual Studio Command Prompt (2010) b\win64\vc_dll.bat which produces lzo2.dll without any errors, however this doesnt look like it really did produce the 64-bit dll as my 32bit C# app can still reference and call methods (successfully) How can I compile the 64bit version? some of the comments on this question may

问题 I am new to LZO compression and decompression. I'm trying to use this lzo-java library. Input Information : I have one byte array which is in compressed format. This byte array I want to decompress and finally I want decompressed byte array. NOTE : I don't know the how much size should give to decompress byte array because I don't know exact size of decompressed byte. I created below code but it is not giving any exception and not even decompressing single byte. Program : InputStream stream =

问题 I am using MiniLZO on a project for some really simple compression tasks. I am compressing with one program, and decompressing with another. I'd like to know how much space to allocate for the decompression buffer. I am fine with over-allocating space, if it can save me the trouble of having to annotate my output file with an integer declaring how much space the decompressed data should take. How would I figure out how much space it could possibly take? After some consideration, I think this

问题 I'm trying to decompress compressed byte array using java-lzo library. I'm following this reference. I added below maven dependency to pom.xml - <dependency> <groupId>org.anarres.lzo</groupId> <artifactId>lzo-core</artifactId> <version>1.0.5</version> </dependency> I created one method which accepts lzo compressed byte array and destination byte array length as a argument. Program : private byte[] decompress(byte[] src, int len) { ByteArrayInputStream input = new ByteArrayInputStream(src);

问题 I got lzo library to use in our application. The version was provided is 1.07. They have given me .lib along with some header file and some .c source files. I have setup test environment as per specs. I am able to see lzo routine functions in my application. Here is my test application #include "stdafx.h" #include "lzoconf.h" #include "lzo1z.h" #include <stdlib.h> int _tmain(int argc, _TCHAR* argv[]) { FILE * pFile; long lSize; unsigned char *i_buff; unsigned char *o_buff; int i_len,e = 0;

问题 I'm trying to use LZO compression library inside my Java program (http://www.oberhumer.com/opensource/lzo/). I could not find a single example how to use it for compression and decompression of data. Can anybody help me with it? Apparently the native code is not in Java, so I'm not also sure what steps to take to use it (JNI or something?!) 回答1: The original code from Oberhumer does not contain a java compressor. You might want to have a look at https://github.com/shevek/lzo-java. Does it

问题 I want to output gzip and lzo formats at the same time in one job. I used MultipleOutputs , and add two named outputs like this: MultipleOutputs.addNamedOutput(job, "LzoOutput", GBKTextOutputFormat.class, Text.class, Text.class); GBKTextOutputFormat.setOutputCompressorClass(job, LzoCodec.class); MultipleOutputs.addNamedOutput(job, "GzOutput", TextOutputFormat.class, Text.class, Text.class); TextOutputFormat.setOutputCompressorClass(job, GzipCodec.class); ( GBKTextOutputFormat here is written