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https://issues.apache.org/jira/browse/HBASE-7525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13731848#comment-13731848
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takeshi.miao commented on HBASE-7525:
-------------------------------------
Dear [~stack]
I have added the rebased patch, pls note that I am still using the Scan for
empty startRowKey case, due to I still suffer the following exception while
testing in my Env.
{code}
...
13/08/07 10:05:11 INFO zookeeper.RecoverableZooKeeper: Process
identifier=hconnection-0x6a3b8b49 connecting to ZooKeeper
ensemble=localhost:2181
13/08/07 10:05:11 INFO zookeeper.ClientCnxn: Session establishment complete on
server localhost.localdomain/127.0.0.1:2181, sessionid = 0x140583a69570010,
negotiated timeout = 90000
Exception in thread "Thread-1" java.lang.IllegalArgumentException: Row length
is 0
at org.apache.hadoop.hbase.client.Mutation.checkRow(Mutation.java:364)
at org.apache.hadoop.hbase.client.Mutation.checkRow(Mutation.java:348)
at org.apache.hadoop.hbase.client.Get.<init>(Get.java:86)
at
org.apache.hadoop.hbase.tool.Canary$RegionServerMonitor.monitorRegionServers(Canary.java:563)
at
org.apache.hadoop.hbase.tool.Canary$RegionServerMonitor.run(Canary.java:540)
at java.lang.Thread.run(Thread.java:662)
{code}
> 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
> Fix For: 0.95.0
>
> 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-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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