Grokbase Groups Hive user May 2011
FAQ
You're pretty much going to overwrite the partition every time you want
to add data to it. I wish there was an append but there isn't. We're
basically doing it the same way you are (looking at your insert statement).

The challenge I'm running into (doing the same thing you are) is when
I'm bulk loading historical logs into hadoop/hive I see heap memory
errors appear. However when I load smaller batches I rarely see those
same out of memory errors go away. I'm curious if you (or anyone) has a
better way of loading historicals.


On 05/10/2011 11:56 AM, bichonfrise74 wrote:
Hi,

My end goal is to load the daily Apache logs. I wish to partition it
by date and the group has helped me in giving some advices, but it
seems that I am still stuck.

My "daily Apache logs" can contain dates for 2 days ago, yesterday,
and today. So, what I did was I created a staging_weblog table and
used hive (using SerDe) to load the logs without any partition. Then I
ran a select distinct to get all the unique dates. And I converted
this date into YYYY-MM-DD format.

After this I created a multi-insert statement like this:
from staging_weblog
insert overwrite table real_weblog
partition ( logdate = '<yyyy-mm-dd>')
select * where regexp_extract( logtime, '([^:]*):.*', 1) = 'dd/MMM/yyyy'

The above works fine if there is no existing partition. But if there
is an existing partition, then it 'overwrites' and replace the old
partition with the new one. The 'overwrite' keyword is mandatory based
on the documentation. But I wish to just append the data to the
existing partition.

Has anyone solved this problem before?

Or let me ask a general question, how do you load your daily Apache
logs into Hadoop so that you can use Hive to process the data?

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postedMay 10, '11 at 5:56p
activeMay 11, '11 at 7:57p
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