Hi Byambajargal, What version of pig does your distribution use ? -Thejas
On 8/22/11 3:42 AM, byambaa wrote:
Hello I have a cluster with 11 nodes each of them have 16 GB RAM, 6 core CPU, 1 TB HDD and i am using cloudera distribution CHD4b with Pig. I have two Pig Join queries which are a Parallel and a Replicated version of pig Join and MapReduce Reduce side and Map side joins. Theoretically Replicated Join could be faster than Parallel join but in my case Parallel is faster. i have a questions : 1.I am wondering why the replicated join is so slowly how it works what is the behind the replicated join. 2. MR reduce side join was faster than parallel pig join, what is implemented background the parallel pig join. i guess pig implement also MR reduce side join. Could you explain me about the Pig joins how it works and what is run behind the pig scripts Replicated Join in HDFS Replicated Join in Hbase MR Reduce side join MR Joins (Singleton pattern) obr_wp_annotation 1786MB 29 sec 50 sec 36 sec 19 obr_ct_annotation 5916MB 799 sec 523 sec 108 sec 69 obr_pm_annotation 16983MB 1794 sec 707 sec 248 sec 138 the relation file is 659MB thanks you very much Byambajargal
