Increase your replication factor as suggested by Nitin. Replication
factor > 1 is a must to avoid data loss. And you can use "fsck"
command to check the HDFS. Also verify whether you are able to see all
the datanodes at the namenode WEBUI page.
Regards,
Mohammad Tariq
On Thu, Jul 5, 2012 at 12:30 PM, Nitin Pawar <nitinpawar...@gmail.com> wrote:
> if you have 2 nodes and replication factor is 1 then this is a problem,
>
> I would like to suggest minimum replication factor as 2
> this would make sure that even if 1 node is down, data is served from
> replicated blocks
>
>
> On Thu, Jul 5, 2012 at 12:27 PM, shaik ahamed <shaik5...@gmail.com> wrote:
>>
>> Thanks for the reply guys,
>>
>> Yesterday night im able to fecth the data .And my second node is down in
>> the sence im not able to connect to the 2 machine as i have 3 machiens 1
>> master and 2 slave .As the 2 second one im not able to connect .Is this the
>> prob for not retreiving the data, or other than this.
>>
>>
>>
>> On Thu, Jul 5, 2012 at 12:23 PM, Nitin Pawar <nitinpawar...@gmail.com>
>> wrote:
>>>
>>> can you check dfs health?
>>>
>>> I think few of your nodes are down
>>>
>>>
>>> On Thu, Jul 5, 2012 at 12:17 PM, shaik ahamed <shaik5...@gmail.com>
>>> wrote:
>>>>
>>>> Hi All,
>>>>
>>>>
>>>> Im not able to fetch the data from the hive table
>>>> ,getting the below error
>>>>
>>>> FAILED: Error in semantic analysis:
>>>>
>>>> hive> select * from vender;
>>>> OK
>>>> Failed with exception java.io.IOException:java.io.IOException: Could not
>>>> obtain block: blk_-3328791500929854839_1178
>>>> file=/user/hive/warehouse/vender/bigtest.txt
>>>> Time taken: 9.129 seconds
>>>> Please help me in this
>>>>
>>>> Regards
>>>> shaik.
>>>
>>>
>>>
>>>
>>> --
>>> Nitin Pawar
>>>
>>
>
>
>
> --
> Nitin Pawar
>
