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HBase >> mail # user >> Starting Abnormally After Shutting Down For Some Time

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Re: Starting Abnormally After Shutting Down For Some Time
Dear Manish,

I appreciate so much for your replies!

The system tmp directory is changed to anther location in my hdfs-site.xml.

If I ran $HADOOP_HOME/bin/start-all.sh, all of the services were listed,
including job tracker and task tracker.

    10211 SecondaryNameNode
    10634 Jps
    9992 DataNode
    10508 TaskTracker
    10312 JobTracker
    9797 NameNode

In the job tracker's log, one exception was found.

org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot delete
s/Hadoop/FS/mapred/system. Name node is in safe mode.

In my system, I didn't see the directory, ~/mapred. How should I configure
for it?

For the properties you listed, they were not set in my system. Are they
required? Since they have default values (
http://hbase.apache.org/docs/r0.20.6/hbase-conf.html), do I need to update

     - hbase.zookeeper.property.clientPort.
     - hbase.zookeeper.quorum.
     - hbase.zookeeper.property.dataDir

Now the system was reinstalled. At least, the pseudo-distributed mode runs
well. I also tried to shut down the ubuntu machine and started it again.
The system worked fine. But I worried the master-related problem must
happen if the machine was shutdown for more time. I really don't understand
the reason.

Thanks so much!


On Wed, Mar 28, 2012 at 3:11 PM, Manish Bhoge <[EMAIL PROTECTED]>wrote:

> Bing,
> As per my experience on the configuration I can list down some points one
> of which may be your solution.
> - first and foremost don't store your service metadata into system tmp
> directory because it may get cleaned up in every start and you loose all
> your job tracker, datanode information. It is as good as you're formatting
> your namenode.
> - if you're using CDH make sure you set up permission perfectly for root,
> dfs data directory and mapred directories.(Refer CDH documentation)
> - I didn't see job tracker in your service list. It should be up and
> running. Check the job tracker log if there is any permission issue when
> starting job tracker and task tracker.
> - before trying your stuff on Hbase set up make sure all your Hadoop
> services are up and running. You can check that by running a sample program
> and check whether job tracker, task tracker responding for your
> mapred.system and mapred.local directories to create intermediate files.
> - once you have all hadoop services up don't set/change any permission.
> As far as Hbase configuration is concerned there are 2 path for set up:
> either you set up zookeeper within hbase-site.xml Or configure separately
> via zoo.cfg. If you are going with hbase setting for zookeeper then confirm
> following setting:
> - hbase.zookeeper.property.clientPort.
> - hbase.zookeeper.quorum.
> - hbase.zookeeper.property.dataDir
> Once you have right setting for these and set up root directory for hbase
> then there not much excercise is required.(Make sure zookeeper service is
> up before you start hbase)
> I think if you follow above rules you should be fine. There is no issue
> because of long time shutdown or frequent machine restart.
>  Champ, moreover you need to have good amount of patience to understand
> the problem :) I do understand how frustating when you set up everything
> and next day you find the things are completely down.
> Sent from my BlackBerry, pls excuse typo
> -----Original Message-----
> From: Bing Li <[EMAIL PROTECTED]>
> Date: Wed, 28 Mar 2012 14:32:12
> Subject: Re: Starting Abnormally After Shutting Down For Some Time
> Jean-Daniel,
> I changed dfs.data.dir and dfs.name.dir to new paths in the hdfs-site.xml.
> I really cannot figure out why the HBase/Hadoop got a problem after a
> couple of days of shutting down. If I use it frequently, no such a master
> problem happens.
> Each time, I have to reinstall not only HBase/Hadoop but also Ubuntu for