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From Jignesh Patel <jigneshmpa...@gmail.com>
Subject Re: Could not resolve the DNS name of unknown
Date Fri, 21 Oct 2011 17:58:10 GMT
I have clean up the zookeeper and it seems my computer name is also changed
today as setting of dynamic ip.

Jignesh-MacBookPro:hadoop hadoop-user$ hostname
Jignesh-MacBookPro.local

But I still have old error

Could not resolve the DNS name of *unknowne4ce8f3898fc*

Why would HServerAddress get old name, instead of taking the latest one.

According to the following article, it advise us to refrain from adding
hardcoded  name as hadoop is efficient to pickup the appropriate DNS name.

http://wiki.datameer.com/display/DAS1/Hadoop+Cluster+Configuration+Tips

On Thu, Oct 20, 2011 at 7:43 PM, Shrijeet Paliwal
<shrijeet@rocketfuel.com>wrote:

> Look for a DNS /etc/hosts related suggestion mentioned here :
> http://search-hadoop.com/m/N45fnRFrG12
> also here
> http://ria101.wordpress.com/2010/01/28/setup-hbase-in-pseudo-distributed-mode-and-connect-java-client/
> Also clean up data from zookeeper if needed and do a restart of
> services , zookkper directory is here usually :
> ${hbase.tmp.dir}/zookeeper
>
>
> PS: This issues has been reported bunch of times. Look deeper in
> mailing archives for changes required in /etc/hosts to get standalone
> hbase running.
>
> On Thu, Oct 20, 2011 at 2:24 PM, Jignesh Patel <jigneshmpatel@gmail.com>
> wrote:
> >
> > Shrijeet
> > I have tried to take help from Mac group and their respond.
> >
> > "An app you wrote, or somebody else's app?
> > I'm not sure exactly how you want us to help, unknowne4ce8f3898fc is
> indeed
> > an invalid hostname."
> >
> > According to them it seems this is a app problem, but I haven' changed
> > anything and my zookeeper recognizes the IP.
> >
> > 2011-10-20 14:19:04,736 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
> > master:49232-0x133228e8a8f0000 Successfully deleted unassigned node for
> > region 70236052 in expected state RS_ZK_REGION_OPENED
> > 2011-10-20 14:19:04,737 DEBUG
> > org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: Opened region
> > -ROOT-,,0.70236052 on 1*92.168.1.120*,49235,1319134727150
> > 2011-10-20 14:19:04,846 ERROR org.apache.hadoop.hbase.HServerAddress:
> Could
> > not resolve the DNS name of *unknowne4ce8f3898fc*
> > 2011-10-20 14:19:04,847 FATAL org.apache.hadoop.hbase.master.HMaster:
> > Unhandled exception. Starting shutdown.
> > java.lang.IllegalArgumentException: hostname can't be null
> >
> > So while I am researching with them, I post their response so that if
> > somebody encounter same problem can direct me.
> >
> > -Jignesh
> > On Thu, Oct 20, 2011 at 2:54 PM, Shrijeet Paliwal
> > <shrijeet@rocketfuel.com>wrote:
> >
> > > Jignesh,
> > > This
> > >
> > >
> http://search-hadoop.com/?q=hbase+dns&fc_project=HBase&fc_type=mail+_hash_+user
> > > and
> > > this
> > > http://www.plus.net/support/software/dns/changing_dns_mac.shtml
> > >
> > > As Stack pointed out in other thread , you can find mac OS communities
> more
> > > helpful for some of your how-toes.
> > >
> > > -Shrijeet
> > >
> > > On Thu, Oct 20, 2011 at 11:47 AM, Jignesh Patel <
> jigneshmpatel@gmail.com
> > > >wrote:
> > >
> > > > Thanks Stack,
> > > >
> > > > Is there any link I can refer for that? I am using Lion OS x. Google
> > > > doesn't
> > > > help me much for this.
> > > >
> > > > -Jignesh
> > > >
> > > > On Thu, Oct 20, 2011 at 12:05 PM, Stack <stack@duboce.net> wrote:
> > > >
> > > > > Fix your DNS, name resolving.
> > > > > St.Ack
> > > > >
> > > > > On Thu, Oct 20, 2011 at 9:02 AM, Jignesh Patel <
> > > jigneshmpatel@gmail.com>
> > > > > wrote:
> > > > > > Hbase was working till yesterday but I am seeing following error
> > > today.
> > > > > >
> > > > > > 2011-10-20 11:52:02,329 ERROR
> org.apache.hadoop.hbase.HServerAddress:
> > > > > Could
> > > > > > not resolve the DNS name of unknowne4ce8f3898fc
> > > > > > 2011-10-20 11:52:02,329 FATAL
> org.apache.hadoop.hbase.master.HMaster:
> > > > > > Unhandled exception. Starting shutdown.
> > > > > > java.lang.IllegalArgumentException: hostname can't be null
> > > > > > at java.net.InetSocketAddress.<init>(InetSocketAddress.java:121)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.HServerAddress.getResolvedAddress(HServerAddress.java:108)
> > > > > > at
> > > > org.apache.hadoop.hbase.HServerAddress.<init>(HServerAddress.java:64)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.catalog.MetaReader.readLocation(MetaReader.java:339)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.catalog.MetaReader.readMetaLocation(MetaReader.java:281)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.catalog.CatalogTracker.getMetaServerConnection(CatalogTracker.java:282)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.catalog.CatalogTracker.verifyMetaRegionLocation(CatalogTracker.java:488)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.master.HMaster.assignRootAndMeta(HMaster.java:441)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:388)
> > > > > > at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:282)
> > > > > > at
> > > > > >
> > > > >
> > > >
> > >
> org.apache.hadoop.hbase.master.HMasterCommandLine$LocalHMaster.run(HMasterCommandLine.java:193)
> > > > > > at java.lang.Thread.run(Thread.java:680)
> > > > > >
> > > > >
> > > >
> > >
>

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