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.
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.
Next: HCatalog Installation