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From Amandeep Khurana <ama...@gmail.com>
Subject Re: Connection problem during data import into hbase
Date Sat, 21 Feb 2009 09:44:22 GMT
Here's another thing thats happening. I was trying to truncate the table.

hbase(main):001:0> truncate 'in_table'
Truncating in_table; it may take a while
Disabling table...
NativeException: org.apache.hadoop.hbase.RegionException: Retries exhausted,
it took too long to wait for the table in_table to be disabled.
    from org/apache/hadoop/hbase/client/HBaseAdmin.java:387:in
`disableTable'
    from org/apache/hadoop/hbase/client/HBaseAdmin.java:348:in
`disableTable'
    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'
    from org/jruby/internal/runtime/methods/SimpleCallbackMethod.java:67:in
`call'
    from org/jruby/internal/runtime/methods/DynamicMethod.java:78:in `call'
    from org/jruby/runtime/CallSite.java:155:in `cacheAndCall'
    from org/jruby/runtime/CallSite.java:332:in `call'
    from org/jruby/evaluator/ASTInterpreter.java:649:in `callNode'
    from org/jruby/evaluator/ASTInterpreter.java:324:in `evalInternal'

I left it for a few minutes and tried again. It worked. There was no load on
the cluster at all. changed the config (both) and added
dfs.datanode.socket.write.timeout property with value 0. I also defined the
property in the job config.

Amandeep


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


On Sat, Feb 21, 2009 at 1:23 AM, Amandeep Khurana <amansk@gmail.com> wrote:

> 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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