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From Amandeep Khurana <ama...@gmail.com>
Subject Re: Connection problem during data import into hbase
Date Sat, 21 Feb 2009 09:23:59 GMT
I have 1 master + 2 slaves.
Am using 0.19.0 for both Hadoop and Hbase.
I didnt change any config from the default except the hbase.rootdir and the
hbase.master.

I have gone through the FAQs but couldnt find anything. What exactly are you
pointing to?


Amandeep Khurana
Computer Science Graduate Student
University of California, Santa Cruz


On Sat, Feb 21, 2009 at 1:14 AM, stack <stack@duboce.net> wrote:

> It looks like regionserver hosting root crashed:
>
> org.apache.hadoop.hbase.client.NoServerForRegionException: Timed out trying
> to locate root region
>
> How many servers you running?
>
> You made similar config. to that reported by Larry Compton in a mail from
> earlier today?  (See FAQ and Troubleshooting page for more on his listed
> configs.)
>
> St.Ack
>
>
> On Sat, Feb 21, 2009 at 1:01 AM, Amandeep Khurana <amansk@gmail.com>
> wrote:
>
> > Yes, the table exists before I start the job.
> >
> > I am not using TableOutputFormat. I picked up the sample code from the
> docs
> > and am using it.
> >
> > Here's the job conf:
> >
> > JobConf conf = new JobConf(getConf(), IN_TABLE_IMPORT.class);
> >        FileInputFormat.setInputPaths(conf, new Path("import_data"));
> >        conf.setMapperClass(MapClass.class);
> >        conf.setNumReduceTasks(0);
> >        conf.setOutputFormat(NullOutputFormat.class);
> >        JobClient.runJob(conf);
> >
> > Interestingly, the hbase shell isnt working now either. Its giving errors
> > even when I give the command "list"...
> >
> >
> >
> > Amandeep Khurana
> > Computer Science Graduate Student
> > University of California, Santa Cruz
> >
> >
> > On Sat, Feb 21, 2009 at 12:10 AM, stack <stack@duboce.net> wrote:
> >
> > > The table exists before you start the MR job?
> > >
> > > When you say 'midway through the job', are you using tableoutputformat
> to
> > > insert into your table?
> > >
> > > Which version of hbase?
> > >
> > > St.Ack
> > >
> > > On Fri, Feb 20, 2009 at 9:55 PM, Amandeep Khurana <amansk@gmail.com>
> > > wrote:
> > >
> > > > I dont know if this is related or not, but it seems to be. After this
> > map
> > > > reduce job, I tried to count the number of entries in the table in
> > hbase
> > > > through the shell. It failed with the following error:
> > > >
> > > > hbase(main):002:0> count 'in_table'
> > > > NativeException: java.lang.NullPointerException: null
> > > >    from java.lang.String:-1:in `<init>'
> > > >    from org/apache/hadoop/hbase/util/Bytes.java:92:in `toString'
> > > >    from
> > > org/apache/hadoop/hbase/client/RetriesExhaustedException.java:50:in
> > > > `getMessage'
> > > >    from
> > > org/apache/hadoop/hbase/client/RetriesExhaustedException.java:40:in
> > > > `<init>'
> > > >    from org/apache/hadoop/hbase/client/HConnectionManager.java:841:in
> > > > `getRegionServerWithRetries'
> > > >    from org/apache/hadoop/hbase/client/MetaScanner.java:56:in
> > `metaScan'
> > > >    from org/apache/hadoop/hbase/client/MetaScanner.java:30:in
> > `metaScan'
> > > >    from org/apache/hadoop/hbase/client/HConnectionManager.java:411:in
> > > > `getHTableDescriptor'
> > > >    from org/apache/hadoop/hbase/client/HTable.java:219:in
> > > > `getTableDescriptor'
> > > >    from sun.reflect.NativeMethodAccessorImpl:-2:in `invoke0'
> > > >    from sun.reflect.NativeMethodAccessorImpl:-1:in `invoke'
> > > >    from sun.reflect.DelegatingMethodAccessorImpl:-1:in `invoke'
> > > >    from java.lang.reflect.Method:-1:in `invoke'
> > > >    from org/jruby/javasupport/JavaMethod.java:250:in
> > > > `invokeWithExceptionHandling'
> > > >    from org/jruby/javasupport/JavaMethod.java:219:in `invoke'
> > > >    from org/jruby/javasupport/JavaClass.java:416:in `execute'
> > > > ... 145 levels...
> > > >    from org/jruby/internal/runtime/methods/DynamicMethod.java:74:in
> > > `call'
> > > >    from org/jruby/internal/runtime/methods/CompiledMethod.java:48:in
> > > `call'
> > > >    from org/jruby/runtime/CallSite.java:123:in `cacheAndCall'
> > > >    from org/jruby/runtime/CallSite.java:298:in `call'
> > > >    from
> > > >
> > > >
> > >
> >
> ruby/hadoop/install/hbase_minus_0_dot_19_dot_0/bin//hadoop/install/hbase/bin/../bin/hirb.rb:429:in
> > > > `__file__'
> > > >    from
> > > >
> > > >
> > >
> >
> ruby/hadoop/install/hbase_minus_0_dot_19_dot_0/bin//hadoop/install/hbase/bin/../bin/hirb.rb:-1:in
> > > > `__file__'
> > > >    from
> > > >
> > > >
> > >
> >
> ruby/hadoop/install/hbase_minus_0_dot_19_dot_0/bin//hadoop/install/hbase/bin/../bin/hirb.rb:-1:in
> > > > `load'
> > > >    from org/jruby/Ruby.java:512:in `runScript'
> > > >    from org/jruby/Ruby.java:432:in `runNormally'
> > > >    from org/jruby/Ruby.java:312:in `runFromMain'
> > > >    from org/jruby/Main.java:144:in `run'
> > > >    from org/jruby/Main.java:89:in `run'
> > > >    from org/jruby/Main.java:80:in `main'
> > > >    from /hadoop/install/hbase/bin/../bin/HBase.rb:444:in `count'
> > > >    from /hadoop/install/hbase/bin/../bin/hirb.rb:348:in `count'
> > > >    from (hbase):3:in `binding'
> > > >
> > > >
> > > > Amandeep Khurana
> > > > Computer Science Graduate Student
> > > > University of California, Santa Cruz
> > > >
> > > >
> > > > On Fri, Feb 20, 2009 at 9:46 PM, Amandeep Khurana <amansk@gmail.com>
> > > > wrote:
> > > >
> > > > > Here's what it throws on the console:
> > > > >
> > > > > 09/02/20 21:45:29 INFO mapred.JobClient: Task Id :
> > > > > attempt_200902201300_0019_m_000006_0, Status : FAILED
> > > > > java.io.IOException: table is null
> > > > >         at IN_TABLE_IMPORT$MapClass.map(IN_TABLE_IMPORT.java:33)
> > > > >         at IN_TABLE_IMPORT$MapClass.map(IN_TABLE_IMPORT.java:1)
> > > > >         at
> org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> > > > >         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:332)
> > > > >         at org.apache.hadoop.mapred.Child.main(Child.java:155)
> > > > >
> > > > > attempt_200902201300_0019_m_000006_0:
> > > > > org.apache.hadoop.hbase.client.NoServerForRegionException: Timed
> out
> > > > trying
> > > > > to locate root region
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:768)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:448)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:430)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:557)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:457)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:430)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:557)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:461)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:423)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > > org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:114)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > > org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:97)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > > IN_TABLE_IMPORT$MapClass.configure(IN_TABLE_IMPORT.java:120)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:83)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > > org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:83)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > > org.apache.hadoop.mapred.MapTask.run(MapTask.java:328)
> > > > > attempt_200902201300_0019_m_000006_0:   at
> > > > > org.apache.hadoop.mapred.Child.main(Child.java:155)
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Amandeep Khurana
> > > > > Computer Science Graduate Student
> > > > > University of California, Santa Cruz
> > > > >
> > > > >
> > > > > On Fri, Feb 20, 2009 at 9:43 PM, Amandeep Khurana <
> amansk@gmail.com
> > > > >wrote:
> > > > >
> > > > >> I am trying to import data from a flat file into Hbase using
a Map
> > > > Reduce
> > > > >> job. There are close to 2 million rows. Mid way into the job,
it
> > > starts
> > > > >> giving me connection problems and eventually kills the job. When
> the
> > > > error
> > > > >> comes, the hbase shell also stops working.
> > > > >>
> > > > >> This is what I get:
> > > > >>
> > > > >> 2009-02-20 21:37:14,407 INFO org.apache.hadoop.ipc.HBaseClass:
> > > Retrying
> > > > connect to server: /171.69.102.52:60020. Already tried 0 time(s).
> > > > >>
> > > > >> What could be going wrong?
> > > > >>
> > > > >> Amandeep
> > > > >>
> > > > >>
> > > > >> Amandeep Khurana
> > > > >> Computer Science Graduate Student
> > > > >> University of California, Santa Cruz
> > > > >>
> > > > >
> > > > >
> > > >
> > >
> >
>

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