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From Stack <st...@duboce.net>
Subject Re: Could not resolve the DNS name of unknown
Date Fri, 21 Oct 2011 22:29:21 GMT
That the servername makes no sense in a particular context has been
fixed in newer versions of hbase.

Is the data in your dev laptop critical?  If not just throw it away
when you move or update.

HBase has not been optimized to run on fellows' laptops.

St.Ack


On Fri, Oct 21, 2011 at 3:15 PM, Jignesh Patel <jigneshmpatel@gmail.com> wrote:
> Statck,
>
> I am at home now in my home network I see one change now the machine name
> is unknowne4ce8f3898fc.
> I will fix this by taking help from Mac people.
>
> But tomorrow I might go from x to y place and machine name may be different
> there.So again Hbase will stop working.
>
> But as per the previous post even after fixing the weird machine name issue
> hbase is not going to forget this name. So what action I need to take so
> that hbase will take up the correct machine name.
> -Jignesh
>
> On Fri, Oct 21, 2011 at 4:36 PM, Stack <stack@duboce.net> wrote:
>
>> Try making it resolve temporarily by adding it to your /etc/hosts.
>> St.Ack
>>
>> On Fri, Oct 21, 2011 at 12:54 PM, Jignesh Patel <jigneshmpatel@gmail.com>
>> wrote:
>> > When I start the hbase first time I always see following error.
>> >
>> > ERROR: java.lang.reflect.UndeclaredThrowableException: Call to
>> > 192.168.1.120/192.168.1.120:49188 failed on local exception:
>> > java.io.EOFException
>> >
>> > but my log file shows
>> >
>> > 2011-10-21 15:45:21,772 ERROR org.apache.hadoop.hbase.HServerAddress:
>> Could
>> > not resolve the DNS name of unknowne4ce8f3898fc
>> > 2011-10-21 15:45:21,773 FATAL org.apache.hadoop.hbase.master.HMaster:
>> > Unhandled exception. Starting shutdown.
>> > java.lang.IllegalArgumentException: hostname can't be null
>> >
>> > How to debug this. Even by searching in the old email it says there was a
>> > bug in 0.90 which is fixed. I am not able to get anything more.
>> >
>> > -Jignesh
>> > On Fri, Oct 21, 2011 at 1:58 PM, Jignesh Patel <jigneshmpatel@gmail.com
>> >wrote:
>> >
>> >> 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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