Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase, mail # user - how to get the timestamp of hfile, like when it's generated.


Copy link to this message
-
Re: how to get the timestamp of hfile, like when it's generated.
Stack 2012-10-17, 05:09
On Tue, Oct 16, 2012 at 9:06 PM, Ramkrishna.S.Vasudevan
<[EMAIL PROTECTED]> wrote:
> Hi Yun Peng
>
> You want to know the creation time? I could see the getModificationTime()
> api.  Internally it is used to get a store file with minimum timestamp.
> I have not tried it out.  Let me know if it solves your purpose.
> Just try it out.
>

To add to Rams' response, if you have a reader on the file, you can
get some of its attributes (which I believe come from metadata block
-- you should check the code) and you can iterate the metadata too
which has stuff first and last keys, average size, etc.  See here:
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/io/hfile/HFile.Reader.html
 To look at a particular file's metadata, see the hfile tool at
"9.7.5.2.2. HFile Tool" in the reference guide.

St.Ack