A connection ZooKeeper client
1. encountered a problem when performing zkCli.sh
-bash: zkCli.sh: command not found
2. The introduction of environmental variables on the line, pay attention to the bin directory
locate zkCli.sh
/opt/cloudera/parcels/CDH-5.13.1-1.cdh5.13.1.p0.2/lib/zookeeper/bin/zkCli.sh
export PATH=/opt/cloudera/parcels/CDH-5.13.1-1.cdh5.13.1.p0.2/lib/zookeeper/bin:$PATH
3. When you can do whatever
4. View a copy of the case ls / hbase / replication
Two, protocol buffer serialized
Come on, leave it to convert the file into a proto-generated Java file cmd command. \ Protoc.exe --java_out =.. \ Risk.proto
1. The new version of the program to make storage serialized with a protocol buffer. Thrown to a buff will be serialized hex head. (Hbase client binary not show, will be displayed in hex)
See thrown to the code sequence is a structure of buf
1.2 continue to look
pb results hex head plus value, which is obviously not the Pb structure.
Look at the code
Direct thrown to the string
Look again at 1.3
Data format on the HDFS
Hbase into the data format, each field has a hexadecimal \ x0 beginning
Third, on the zkCli.sh
1. zkCli.sh representation of the path name for zookeeper-client /opt/cloudera/parcels/CDH-5.13.1-1.cdh5.13.1.p0.2/bin
Can be started directly by zookeeper-client
2. cd to the directory each time it needs, too much trouble, and thus used the alias
alias zkCli.sh='/opt/cloudera/parcels/CDH-5.13.1-1.cdh5.13.1.p0.2/bin/zookeeper-client'
3. 可以加到环境变量 .bashrc 里，以后直接zkCli.sh 就可以启动啦。
另外 shift zz =wq！ (vi 模式下的保存)
