Mario Casola 2013-06-14, 15:54
Sanjay Subramanian 2013-06-14, 16:21
Mario Casola 2013-06-14, 16:54
-Re: hive to hbase mapping
kulkarni.swarnim@... 2013-06-15, 01:43
Since your jobs are at 0%, it might actually be a problem with your hadoop cluster rather than hive. Couple of things to check would be:
1. Does a simple M/R job complete successfully?
2. Do logs for the jobs say something? Are the jobs in running state or pending state?
3. It is possible that job submitted from hive is unable to find the zookeeper quorum. To do that, you need to set "hbase.zookeeper.quorum" property in your hive-site.xml to point to your zookeeper quorum.
Hope this helps.
On Jun 14, 2013, at 11:54 AM, Mario Casola <[EMAIL PROTECTED]> wrote:
> Hi Sanjay,
> thanks for the response.
> I need Hbase because is perfect for aggregating data through the counters, and write performance is great.
> Now the problem is...Which is the best way for loading periodically (every hour for example) Hbase data in Hive table?
> 2013/6/14 Sanjay Subramanian <[EMAIL PROTECTED]>
>> 6 months back I was tasked with building a Data platform for logs and I benchmarked
>> Hbase + Hive (queries were 8X slower)
>> Hive only
>> So I decided for Hive option and am deploying that solution to production.
>> Couple of things u can think while u design if u really want to go HBase+Hive (also look at this http://hadoopstack.com/hive-on-hbase-part-1/)
>> - Query only todays data in a Hive+Hbase architecture
>> - Older data than one day query Hive only
>> Hope I am not diverting from your question and problem
>> From: Mario Casola <[EMAIL PROTECTED]>
>> Reply-To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
>> Date: Friday, June 14, 2013 8:54 AM
>> To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
>> Subject: hive to hbase mapping
>> I have a performance issue when I query HBase from Hive.
>> My idea is to build the scenario below:
>> 1. Collect data in hbase for aggregation purpose
>> 2. Create an external table that map Hive to Hbase
>> 3. Create a real Hive table
>> 4. Periodically transfer data from hbase to Hive through "INSERTO INTO <real hive table> SELECT * FROM <external table> WHERE time = 201305212909"
>> Currently I'm doing a test on a Hbase table that has 70,000,000 rows and I'm trying to query this table with a single column value filter, like the query above.
>> If I try this type of query directly in Hbase the response time is around 80 seconds.
>> If I try the query in Hive shell, after 30 minutes, all the tasks (9 in my case) are 0,00% complete.
>> Which could be the problem?
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Mario Casola 2013-06-17, 13:00
Sanjay Subramanian 2013-06-18, 06:54