加入系统命令

• cd sys-shell

• sudo cp stream-2.8.0-SNAPSHOT-exec.jar /opt/java/lib

• sudo vim /etc/profile

  添加：export STREAM_LIB_PATH=/opt/java/lib

• source /etc/profile

• sudo cp cardinality /usr/bin

  sudo cp topk /usr/bin

使用示例

$ echo -e "foo\nfoo\nbar" | topk 
item count error
---- ----- -----
 foo     2     0
 bar     1     0

Item count: 3


$ echo -e "foo\nfoo\nbar" | cardinality 
Item Count Cardinality Estimate
---------- --------------------
         3                    2