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From varun kumar <varun....@gmail.com>
Subject Re: HDFS undo Overwriting
Date Mon, 02 Jun 2014 09:40:06 GMT
Nope.

Sorry :(


On Mon, Jun 2, 2014 at 1:31 PM, Amjad ALSHABANI <ashshabani@gmail.com>
wrote:

> Thanx Zesheng,
>
> I should admit that I m not an expert in Hadoop infrastructure, but I have
> heard my colleagues talking about HDFS replicas?
> Couldn't that help in retrieving the lost data??
>
> Amjad
>
>
> On Fri, May 30, 2014 at 1:44 PM, Zesheng Wu <wuzesheng86@gmail.com> wrote:
>
>> I am afraid this cannot undo, in HDFS only the data which is deleted by
>> the dfs client and goes into the trash can be undone.
>>
>>
>> 2014-05-30 18:18 GMT+08:00 Amjad ALSHABANI <ashshabani@gmail.com>:
>>
>> Hello Everybody,
>>>
>>> I ve made a mistake when writing to HDFS. I created new database in Hive
>>> giving the location on HDFS but I found that it removed all other data that
>>> exist already.
>>>
>>> =====
>>> before creation, the directory on HDFS contains :
>>> pns@app11:~$ hadoop fs -ls /user/hive/warehouse
>>> Found 25 items
>>> drwxr-xr-x   - user1 supergroup          0 2013-11-20 13:40
>>> */user/hive/warehouse/*dfy_ans_autres
>>> drwxr-xr-x   - user1 supergroup          0 2013-11-20 13:40
>>> /user/hive/warehouse/dfy_ans_maillog
>>> drwxr-xr-x   - user1 supergroup          0 2013-11-20 14:28
>>> /user/hive/warehouse/dfy_cnx
>>> drwxr-xr-x   - user2           supergroup          0 2014-05-30 06:05
>>> /user/hive/warehouse/pns.db
>>> drwxr-xr-x   - user2          supergroup          0 2014-02-24 17:00
>>> /user/hive/warehouse/pns_fr_integ
>>> drwxr-xr-x   - user2          supergroup          0 2014-05-06 15:33
>>> /user/hive/warehouse/pns_logstat.db
>>> ...
>>> ...
>>> ...
>>>
>>>
>>> hive -e "CREATE DATABASE my_stats LOCATION 'hdfs://XXXX:9000
>>> */user/hive/warehouse/*mystats.db'"
>>>
>>> but now I couldn't see the other directories on HDFS:
>>>
>>> pns@app11:~/aalshabani$ hls /user/hive/warehouse
>>> Found 1 items
>>> drwxr-xr-x   - user2 supergroup          0 2014-05-30 11:37
>>> */user/hive/warehouse*/mystats.db
>>>
>>>
>>> Is there anyway I could restore the other directories??
>>>
>>>
>>> Best regards.
>>>
>>
>>
>>
>> --
>> Best Wishes!
>>
>> Yours, Zesheng
>>
>
>


-- 
Regards,
Varun Kumar.P

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