Some things on techology

错误： [code="java"]ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs [/code] DataNode的VERSION内容： [code="java"][hadoop@dl180-2 current]$ more /...

To create the list of tasks to run, the job scheduler first retrieves the input splits computed by the JobClient from the shared filesystem.It then creates one map task for each split. 事实上，当输入数据足够小...