HBase Canary 用于检测HBase 系统的状态。它对指定表的每一个region 抓取一行，来探测失败或者延迟。
hbase org.apache.hadoop.hbase.tool.Canary -help
Usage: bin/hbase org.apache.hadoop.hbase.tool.Canary [opts] [table1 [table2]...] | [regionserver1 [regionserver2]..]
where [opts] are:
-help Show this help and exit.
-regionserver replace the table argument to regionserver,
which means to enable regionserver mode
-daemon Continuous check at defined intervals.
-interval <N> Interval between checks (sec)
-e Use region/regionserver as regular expression
which means the region/regionserver is regular expression pattern
-f <B> stop whole program if first error occurs, default is true
-t <N> timeout for a check, default is 600000 (milisecs)
（1）检测每一个表的每一个region的每一个列簇。
hbase org.apache.hadoop.hbase.tool.Canary
（2）检测指定表的每一个region的每一个列簇，表之间用空格分开
hbase orghapache.hadoop.hbase.tool.Canary test-01 test-02
（3）检测regionserver
hbase orghapache.hadoop.hbase.tool.Canary -regionserver
（4）正则表达式检测
hbase orghapache.hadoop.hbase.tool.Canary -e test-0[1-2]
(5)以daemon模式运行
hbase orghapache.hadoop.hbase.tool.Canary -daemon
时间间隔为50000毫秒，出现错误不会停止
hbase orghapache.hadoop.hbase.tool.Canary -daemon -interval 50000 -f false
（6）指定超时
hbase orghapache.hadoop.hbase.tool.Canary -daemon -t 6000000