compression

问题 Hive 2.1 I have following table definition : CREATE EXTERNAL TABLE table_snappy ( a STRING, b INT) PARTITIONED BY (c STRING) ROW FORMAT SERDE 'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe' STORED AS INPUTFORMAT 'org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormat' OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat' LOCATION '/' TBLPROPERTIES ('parquet.compress'='SNAPPY'); Now, I would like to insert data into it : INSERT INTO table_snappy

问题 I created a Python script to compress text by using the Huffman algorithm. Say I have the following string: string = 'The quick brown fox jumps over the lazy dog' Running my algorithm returns the following 'bits': result = '01111100111010101111010011111010000000011000111000010111110111110010100110010011010100101111100011110001000110101100111101000010101101110110111000111010101110010111111110011000101101000110111000' By comparing the amount of bits of the result with the input string, the

问题 I giving a tar.bz2 file ,.gz and tar.gz files as input after changing the properties in mapred-site.xml. None of the above seem to have worked. What I assumed to happen here is the records read as input by hadoop go out of sequence ie. one column of input is string and the other is an integer but while reading it from the compressed file because of some out of sequence data, at some point hadoop reads the string part as an integer and generates an illegal format exception. I'm just a noob. I

问题 So people have been having problems compressing the output of Scalding Jobs including myself. After googling I get the odd hiff of an answer in a some obscure forum somewhere but nothing suitable for peoples copy and paste needs. I would like an output like Tsv , but writes compressed output. 回答1: Anyway after much faffification I managed to write a TsvCompressed output which seems to do the job (you still need to set the hadoop job system configuration properties, i.e. set compress to true,

问题 I am implementing run length encoding using the GZipStream class in a C# winforms app. Data is provided as a series of strings separated by newline characters, like this: FFFFFFFF FFFFFEFF FDFFFFFF 00FFFFFF Before compressing, I convert the string to a byte array, but doing so fails if newline characters are present. Each newline is significant, but I am not sure how to preserve their position in the encoding. Here is the code I am using to convert to a byte array: private static byte[]

问题 I am currently working on a program that takes a .pcap file and separates all of the packets out by ip using the scapy package. I want to decompress the payloads that are compressed using the gzip package. I can tell if the payload is gzipped because it contains Content-Encoding: gzip I am trying to use fileStream = StringIO.StringIO(payload) gzipper = gzip.GzipFile(fileobj=fileStream) data = gzipper.read() to decompress the payload, where payload = str(pkt[TCP].payload) When I try to do this

问题 Im producing some automated tasks at work where i need to zip certain files and/or folders. What im trying to do is getting zip the text files in folder 1 which contains 4 txt files. Executing this command gives an error but still zips the txt files : Exception calling "CreateFromDirectory" with "4" argument(s): "The directory name is invalid. " At line:15 char:13 + [System.IO.Compression.ZipFile]::CreateFromDirectory($Source, "$Sour ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

问题 I'm working on a personal iOS project that requires full screen videos (15 seconds in length) to be uploaded to a backend over a 4G connection. While I can take videos just fine, the output size of the file comes out to 30MB which makes me think I'm doing something drastically wrong when it comes to compression. Below is the code I'm using to se up the AssetWriter: -(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:

问题 I have come up with the term loop rolling myself with the hope that it does not overlap with an existing term. Basically I'm trying to come up with an algorithm to find loops in a printed text. Some examples from simple to complicated Example1 Given: a a a a a b c d I want to say: 5x(a) b c d or algorithmically: for 1 .. 5 print a end print b print c print d Example2 Given: a b a b a b a b c d I want to say: 4x(a b) c d or algorithmically: for 1 .. 4 print a print b end print c print d

问题 I'm playing with Jetty GzipHandler and it seems to work rather strangely: It only compresses already compressed files. My whole setup is GzipHandler gzipHandler = new GzipHandler(); gzipHandler.setHandler(myHandler); server.setHandler(gzipHandler); The browser (Chromium) always sends a header containing Accept-Encoding:gzip,deflate,sdch so according to the documentation GZIP Handler This handler will gzip the content of a response if: The filter is mapped to a matching path The response