mp4 combiner

Brief IntroductionThe role of combiner is to combine the multiple of a map generation into a new one , and then the new one as the input of reduce;There is a combine function between the map function and the reduce function to reduce the intermediate result of the map output, which reduces the data of the map output and reduces the network transmission load ;It is not possible to use Combiner,

ArticleDirectory Declare combiner Function Many mapreduceProgramLimited by the available bandwidth on the cluster, it will try its best to minimize the intermediate data that needs to be transmitted between map and reduce tasks. Hadoop allows you to declare a combiner function to process map output, and use your own map processing result as the reduce input. Because

One: BackgroundIn the MapReduce model, the function of reduce is mostly statistical classification type of total, the maximum value of the minimum value, etc., for these operations can consider the map output after the combiner operation, so as to reduce network transport load, while reducing the burden of reduce tasks . The combiner operation is run on each node, only affects the output of the local map,

As we all know, the hadoop framework uses Mapper to process data into a In the above process, we can see at least two performance bottlenecks: If we have 1 billion million data records, mapper will generate 1 billion key-value pairs for transmission across the network, but if we only calculate the maximum value for the data, obviously, mapper only needs to output the maximum value it knows. This not only reduces the network pressure, but also greatly improves program efficiency. This defini

What is combiner Functions “Many MapReduce jobs are limited by the bandwidth available on the cluster, so it paysto minimize the data transferred between map and reduce tasks. Hadoop allows the user to specify a combiner function to be run on the map output—the combiner function’soutput forms the input to the reduce function. Since the

1.CombinerCombiner is an optimization method for MapReduce. Each map can generate a large amount of local output, and the Combiner function is to merge the output of the map end first to reduce the amount of data transferred between the map and reduce nodes to improve network IO performance. The combiner can be set only if the operation satisfies the binding law.The role of

Partitioner Programming data that has some common characteristics is written to the same file. Sorting and grouping when sorting in the map and reduce phases, the comparison is K2. V2 are not involved in sorting comparisons. If you want V2 to be sorted, you need to assemble K2 and V2 into new classes as K2,To participate in the comparison. If you want to customize the collation, the sorted object is implementedWritablecomparable interface, implementing collations in the CompareTo method

As we all know, the hadoop framework uses Mapper to process data into a In the above process, we can see at least two performance bottlenecks: If we have 1 billion million data records, mapper will generate 1 billion key-value pairs for transmission across the network, but if we only calculate the maximum value for the data, obviously, mapper only needs to output the maximum value it knows. This not only reduces the network pressure, but also greatly improves program efficiency. This defini

1. Concept2. ReferencesImprove the MapReduce job Efficiency Note II of Hadoop (use combiner as much as possible): Http://sishuo (k). com/forum/blogpost/list/5829.htmlHadoop Learning notes -8.combiner and custom Combiner:http://www.tuicool.com/articles/qazujavHadoop in-depth learning: combiner:http://blog.csdn.net/cnbird2008/article/details/23788233(mean Scene) 0Hadoop using

The bandwidth available on the cluster limits the number of mapreduce jobs, so the most important thing to do is to avoid the data transfer between the map task and the reduce task as much as possible. Hadoop allows users to specify a merge function for the output of the map task, and sometimes we also call it combiner, which is like mapper and reducer.The output of the merge function as input to the reduce function, because the merge function is an o

mp4 should be considered a more complex media format, originating from QuickTime. It took a while to study, especially how to integrate it perfectly into the video-on- Demand application, but also a great deal of effort, the main problem is to handle the large "media head" of MP4 file. Of course, streaming media On demand can also be used in the FLV format, FLV can also encapsulate the video data, but Ad

At present, the network on the MP4 file format summary has been quite a lot, I am not here to copy others summed up things, want to get started Baidu will have a lot of this article. Here is a MP4 file structure that is rarely involved in other articles, that is, fragment MP4, also known as ISMV files.To really understand the

skyseraph Blog Park home Bo asked flash new essay contact subscription management essay-190 article-0 Comment-408 "Media" h264-mp4 format and extract H264 SPS, pps and bitstream in MP4 file c2> "Stream Media" h264-mp4 format and extract H264 SPS, pps and bitstream in MP4 file Skyseraph APR 1st 2012 Email:skyseraph00@16

h264-mp4 format and extract H264 SPS, pps and bitstream in the MP4 file Skyseraph APR 1st 2012 Email:skyseraph00@163.com First, MP4 format basic concept MP4 format corresponds to Standard MPEG-4 standard (iso/iec14496) Second, MP4 packaging format core concept 1

I used "PersistentOps quot; avthumbmp 4 .. "If the source file is MP4, qiniu will perform the transcoding operation or directly upload the file, which involves money issues. Thank you for your advice !!! I used "PersistentOps =" avthumb/mp4 /.. "If the source file is MP4, qiniu will perform the transcoding operation or directly upload the file, which involves mo

Recently in the study of some of the web players, Videojs\ckplayer\jwplayer and other page players, found that in the video playback, some MP4 format video is not able to play on the side of the cache, read some information online, found that these MP4 format video, " metadata information is not in the first frame A MP4 conversion tool was also found on one of t

At present, the network on the MP4 file format summary has been quite a lot, I am not here to copy others summed up things, want to get started Baidu will have a lot of this article. Here is a MP4 file structure that is rarely involved in other articles, that is, fragment MP4, also known as ISMV files. To really understand the

Document directory Lite MP4 tool download resource list Lite MP4 tool v2.3-professional MP4 video Conversion Tool Introduction: Lite MP4Tool is completely free of charge and can be used without installation. It is a set of conversion tools that automatically generate AVS and compress the output mp4avc format (supports playback by PSP, iPhone, Android, and oth

Non-MP4 video conversion to MP4 process based on ffmpeg teaching resource libraryOperating Environment:Win2003(or Win2008 64bit, priority this step),SQL Server 2005(or SQL Server2008 )Execution mode:Batch mode execution, converted video list, write database, error log write to the local execution program.1. Conversion Step Description1. Non- MP4 Video listConnec

You can use the File class to batch Delete duplicate files in a File, for example, haokan (22.16.mp4, haokan (32.16.mp4, 1 public class HH {2 public static void main (String [] args) {3 String s = "he is a boy"; 4 int result = s. indexOf ("boy ");I am using the indexOf () method;5 if (result> = 0) {6 System. out. println ("boy is part of he is a boy"); 7} else {8 System. out. println ("boy is not part of he