input split in hadoop

Write more verbose, if you are eager to find the answer directly to see the bold part of the .... (PS: What is written here is all the content in the official document of the 2.5.2, the problem I encountered when I did it) When you execute a mapreduce job locally, you encounter the problem of No such file or directory, follow the steps in the official documentation: 1. Formatting Namenode Bin/hdfs Namenode-format 2. Start the Namenode and Datanode daemon threads sbin/start-dfs.sh 3. If th

ThisIn fact, it is very simple to put M identical apples on the same plate and ask how many ways to put them. I want to make some changes to this question first. If it is placed on different dishes, the result will be X1 + X2 + X3 +... + Xn = the number of M solutions. A combination of mathematics is called a combination of multiple sets. If the plate is different and the plate is not empty, this is an

We know that hadoop will use inputformat to pre-process the data before processing the data to the map: Split the input data and generate a group of splits. One split is distributed to a mapper for processing. For each split, create a recordreader to read the data in the split