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From Amjad ALSHABANI <ashshab...@gmail.com>
Subject Re: HDFS undo Overwriting
Date Mon, 02 Jun 2014 08:01:24 GMT
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
>

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