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https://issues.apache.org/jira/browse/HBASE-7525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625336#comment-13625336
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takeshi.miao commented on HBASE-7525:
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I also tested it with hbase-0.95 branch
                
> A canary monitoring program specifically for regionserver
> ---------------------------------------------------------
>
>                 Key: HBASE-7525
>                 URL: https://issues.apache.org/jira/browse/HBASE-7525
>             Project: HBase
>          Issue Type: New Feature
>          Components: monitoring
>    Affects Versions: 0.94.0
>            Reporter: takeshi.miao
>            Priority: Minor
>         Attachments: HBASE-7525-0.95-v0.patch, HBASE-7525-v0.patch, 
> RegionServerCanary.java
>
>
> *Motivation*
> This ticket is to provide a canary monitoring tool specifically for 
> HRegionserver, details as follows
> 1. This tool is required by operation team due to they thought that the 
> canary for each region of a HBase is too many for them, so I implemented this 
> coarse-granular one based on the original o.a.h.h.tool.Canary for them
> 2. And this tool is implemented by multi-threading, which means the each Get 
> request sent by a thread. the reason I use this way is due to we suffered the 
> region server hung issue by now the root cause is still not clear. so this 
> tool can help operation team to detect hung region server if any.
> *example*
> 1. the tool docs
> ./bin/hbase org.apache.hadoop.hbase.tool.RegionServerCanary -help
> Usage: [opts] [regionServerName 1 [regionServrName 2...]]
>  regionServerName - FQDN serverName, can use linux command:hostname -f to 
> check your serverName
>  where [-opts] are:
>    -help Show this help and exit.
>    -e    Use regionServerName as regular expression
>       which means the regionServerName 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)
>    -daemon        Continuous check at defined intervals.
>    -interval <N>  Interval between checks (sec)
> 2. Will send a request to each regionserver in a HBase cluster
> ./bin/hbase org.apache.hadoop.hbase.tool.RegionServerCanary
> 3. Will send a request to a regionserver by given name
> ./bin/hbase org.apache.hadoop.hbase.tool.RegionServerCanary rs1.domainname
> 4. Will send a request to regionserver(s) by given regular-expression
> /opt/trend/circus-opstool/bin/hbase-canary-monitor-each-regionserver.sh -e 
> rs1.domainname.pattern
> // another example
> ./bin/hbase org.apache.hadoop.hbase.tool.RegionServerCanary -e 
> tw-poc-tm-puppet-hdn[0-9]\{1,2\}.client.tw.trendnet.org
> 5. Will send a request to a regionserver and also set a timeout limit for 
> this test
> // query regionserver:rs1.domainname with timeout limit 10sec
> // -f false, means that will not exit this program even test failed
> ./bin/hbase org.apache.hadoop.hbase.tool.RegionServerCanary -f false -t 10000 
> rs1.domainname
> // echo "1" if timeout
> echo "$?"
> 6. Will run as daemon mode, which means it will send request to each 
> regionserver periodically
> ./bin/hbase org.apache.hadoop.hbase.tool.RegionServerCanary -daemon

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