Martinus,
High-Availability NameNode is being worked upon and an initial version
will be out soon. Check out the
https://issues.apache.org/jira/browse/HDFS-1623 JIRA for its
state/discussions.
You can also clone the Hadoop repo and switch to branch 'HDFS-1623' to
give it a whirl, although it is still being worked upon presently.
For now, we recommend using multiple ${dfs.name.dir} directories
(across mounts), preferably one of them being a reliable-enough NFS
point.
On Wed, Jan 4, 2012 at 2:26 PM, Martinus Martinus <martinus...@gmail.com> wrote:
> Hi Bharath,
>
> Thanks for your answer. I remembered hadoop has single point of failure,
> which is it's namenode. Is there a way to make my hadoop clusters to become
> fault tolerant, even when the master node (namenode) fail?
>
>
> Thanks and Happy New Year 2012.
>
> On Tue, Jan 3, 2012 at 2:20 AM, Bharath Mundlapudi <mundlap...@gmail.com>
> wrote:
>>
>> You might want to check the datanode logs. Go to the 3 remaining nodes
>> which didn't start and restart the datanode.
>>
>> -Bharath
>>
>>
>> On Sun, Jan 1, 2012 at 7:23 PM, Martinus Martinus <martinus...@gmail.com>
>> wrote:
>>>
>>> Hi,
>>>
>>> I have setup a hadoop clusters with 4 nodes and I have start-all.sh and
>>> checked in every node, there are tasktracker and datanode run, but when I
>>> run hadoop dfsadmin -report it's said like this :
>>>
>>> Configured Capacity: 30352158720 (28.27 GB)
>>> Present Capacity: 3756392448 (3.5 GB)
>>> DFS Remaining: 3756355584 (3.5 GB)
>>> DFS Used: 36864 (36 KB)
>>> DFS Used%: 0%
>>> Under replicated blocks: 1
>>> Blocks with corrupt replicas: 0
>>> Missing blocks: 0
>>>
>>> -------------------------------------------------
>>> Datanodes available: 1 (1 total, 0 dead)
>>>
>>> Name: 192.168.1.1:50010
>>> Decommission Status : Normal
>>> Configured Capacity: 30352158720 (28.27 GB)
>>> DFS Used: 36864 (36 KB)
>>> Non DFS Used: 26595766272 (24.77 GB)
>>> DFS Remaining: 3756355584(3.5 GB)
>>> DFS Used%: 0%
>>> DFS Remaining%: 12.38%
>>> Last contact: Mon Jan 02 11:19:44 CST 2012
>>>
>>> Why is there only total 1 node available? How to fix this problem?
>>>
>>> Thanks.
>>
>>
>
--
Harsh J
