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From Zesheng Wu <wuzeshen...@gmail.com>
Subject Re: HDFS undo Overwriting
Date Fri, 30 May 2014 11:44:51 GMT
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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