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From Holger Stenzhorn <holger.stenzh...@gmail.com>
Subject Re: NoSuchElementException when creating a table
Date Tue, 06 Nov 2007 20:24:25 GMT

As mentioned before, setting "${hadoop.tmp.dir}" to a clean (or 
non-existent) directory works fine and the HBase starts nicely. ...also 
showing the mentioned ".META." entries in the log file. So, no need to 
worry anymore - I guess... :-)

Perhaps you could add to the "10 minutes" page at point 3.1 an example 
for Unix and Windows/Cygwin to make the different path handling a bit 


Michael Stack wrote:
> Holger Stenzhorn wrote:
>>>>> Hadoop RunJar looks to contain the only use of hadoop.tmp.dir 
>>>>> other than test and contrib code.  It does the following: 'new 
>>>>> File(new Configuration().get("hadoop.tmp.dir"));' using 
>>>>> java.io.File.  In hbase, its all Path and hadoop FileSystem. So, 
>>>>> yes, content of hadoop.tmp.dir is treated differently.
>>>> Could that be changed? ...meaning, wouldn't it be sensible to 
>>>> change HBase (to use Path etc.) so it behaves like Hadoop?
>>> You mean, can hadoop be changed?  (Its hbase that's drunk the 
>>> kool-aid; its the one that goes via hadoop FileSystem for all 
>>> filesystem accesses whereas the hadoop use of hadoop.tmp.dir goes 
>>> via java.io.File).
>> Nope. I mean the other way around: Can you change the HBase code so 
>> it goes via the Hadoop filesystem? ...or would this imply a 
>> performance drop for HBase?
> It already does (See my comments above).
>>> What happens if you clean up your local directory removing 
>>> ${hadoop.tmp.dir} and retry?
>> Again, if I use "c:\tmp\hadoop-holste" as value for 
>> "${hadoop.tmp.dir}" it works: The log reflects just the situation 
>> when this variable is not set in "hbase-site.xml" - then it does not 
>> work.
>> I also forgot to mention in my last my that it is not just 
>> "${hadoop.tmp.dir}" set to "/tmp/hadoop-${user.name}" that causes the 
>> problem but also if it is set to "/tmp/hadoop-holste".
> Did you try my suggestion of removing anything that might once have 
> been a value for hadoop.tmp.dir?
> Testing here on cygwin using local filesystem and all defaults, it all 
> just works fine.  I'm disturbed by the state you seem to be in where 
> the .META. table is not being deployed AND there is no exception 
> saying why.   The only think I can think is that previous runs have 
> left a horked -ROOT- region on the filesystem.
> Good on you Holger,
> St.Ack
>>> Thanks,
>>> St.Ack
>>>>> Did you just change the value of hadoop.tmp.dir from 
>>>>> /tmp/hadoop-${user.name} to /tmp/hadoop-holste on cygwin and it 
>>>>> then worked?
>>>> No. I changed it to changed the value "c:\tmp\hadoop-holste".
>>>>>> Also, I tried to do the very same (as described in my intitial 
>>>>>> mail) on Ubuntu also *without* specifying "hadoop.tmp.dir".
>>>>>> There it works wihtout problems...
>>>>> Yeah.  I know things work out-of-the-box on linux/macosx.  Jim has 
>>>>> been doing a bunch of work trying to get the same to happen on 
>>>>> cygwin (10Minutes has the latest fruit of his work).
>>>>>> As requested by Michel Stack I also attach my log (turned to 
>>>>>> debug) when starting the server.
>>>>> Thanks for the log.  Comments interlaced.
>>>>>> Cheers,
>>>>>> Holger
>>>>>> 07/11/02 13:40:09 DEBUG conf.Configuration: java.io.IOException:

>>>>>> config()
>>>>>>   at 
>>>>>> org.apache.hadoop.conf.Configuration.<init>(Configuration.java:144)
>>>>>>   at 
>>>>>> org.apache.hadoop.hbase.HBaseConfiguration.<init>(HBaseConfiguration.java:30)

>>>>>>   at org.apache.hadoop.hbase.HMaster.doMain(HMaster.java:3043)
>>>>>>   at org.apache.hadoop.hbase.HMaster.main(HMaster.java:3097)
>>>> ...

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