[jira] [Commented] (HBASE-7525) A canary monitoring program specifically for regionserver

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-7525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767688#comment-13767688 ] 

stack commented on HBASE-7525:
------------------------------

bq. Yes, it's default behavior is just align with the old one, does the all regions monitoring

Ok.  The original behavior is a little 'surprising' but if it has been this way up to this, it is fair-enough changing it.

bq. It is the internal DEBUG msg, for counting how many loop of this monitor instance did; It can help user to observe the monitor instance's behavior whether as expected

I did not understand this log message.  I did not seem to ask for more than one loop so seeing more than one w/o asking for it is unexpected.

bq. The option '-regionserver' (regionserver mode) is exclusive with the default mode (region mode), which means user can only choose to use default mode or regionserver mode either

Understood.  We should fix the usage to make it more plain it exclusive w/ table ops:

Usage: ./bin/hbase Canary [opts] [table1 [table2]...] | [regionserver1 [regionserver2]..]

... or something like that.  As is it would seem to mix the exlusive args.

Your suggestion would allow:

Canary table1 regionserver2 ,etc.

Suggest that in the usage you are more clear that it is table OR regionserver ops.
                
> 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: Critical
>             Fix For: 0.98.0
>
>         Attachments: HBASE-7525-0.95-v0.patch, HBASE-7525-0.95-v1.patch, HBASE-7525-0.95-v3.patch, HBASE-7525-0.95-v4.patch, HBASE-7525-0.95-v6.patch, HBASE-7525-trunk-v2.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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