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  • HCatalog UsingHCat

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No Format
alter table processedevents add partition 20100819 hdfs://data/processedevents/20100819/data

select advertiser_id, count(clicks)
from processedevents
where date = '20100819'

group by advertiser_id;

With HCatalog, Robert does not need to modify the table structure.

No Format
select advertiser_id, count(clicks)
from processedevents
where date = ‘20100819’

group by advertiser_id;

HCatalog Web API

WebHCat is a REST API for HCatalog. (REST means stands for "representational state transfer.) The ", a style of API based on HTTP verbs).  The original name of WebHCat was Templeton. For more information, see the WebHCat manual.

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Old version of this document (HCatalog 0.5.0): Overview