testUsage: hadoop fs -test -[defswrz] URIOptions:-d: if the path is a directory, return 0.-e: if the path exists, return 0.-f: if the path is a file, return 0.-s: if the path is not empty, retu
ssh $(hdfs haadmin -getAllServiceState |grep active |awk -F ':' '{print $1}') "NN_DIR=$(hdfs getconf -confKey 'dfs.namenode.
fs.s3a.buffer.dirdefualt:${hadoop.tmp.dir}/s3adesc:Comma separated list of directories that will be used to buffer file uploads to.此参数在用到org.apache.hadoo
原理:上传本地文件到 HDFS 过程:20G May 25 14:56 xx.tarhdfs dfs -put xx.tar /data/hdfs dfs -ls /data//data/xx.tar._COPYING_通过
原理:client:client --create--> namenode -> block ->packet ->DataStreamer -> datanode --ack--> client --complete-->
查看 datanode block 是否均匀hdfs dfsadmin -report |grep 'DFS Used%'
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