1. Life without JOINs... understanding, and common practices stackoverflow.comLots of "BAW"s (big ass-websites) are using data storage and retrieval techniques that rely on huge tables with indexes, and using queries that won't/can't use JOINs in their queries (BigTable, HQL, ... |
2. Hadoop: intervals and JOIN stackoverflow.comI'm very new to Hadoop and I'm currently trying to join two sources of data where the key is an interval (say [date-begin/date-end]). For example: input1: |
3. Hadoop's Map-side join implements Hash join? stackoverflow.comI try to implement Hash join in Hadoop. However, Hadoop seems to have already a map-side join and a reduce - side join already implemented. What is the difference between these techniques and ... |
4. Is Hadoop a good open-source project to join? stackoverflow.comI've been learning Java for the last 2 months with a Core Java book. Now I want to write something real, but at first I decided that I need to improve ... |
5. Similarity join using Hadoop stackoverflow.comI'm new to hadoop. I'd like to run some approaches with you that I came up with.
Problem: |
6. How would you suggest performing "Join" with Hadoop streaming? stackoverflow.comI have two files, in the following formats: field1, field2, field3 field4, field1, field5 where different field number indicates different meaning. I want to join the two files using Hadoop Streaming based on the mutual ... |
7. Understanding SQL joins within WHERE clause stackoverflow.comI have a query in SQL that I'm trying to translate into Pig Latin (for use on a Hadoop cluster). Most of the time I have no problem moving the ... |
8. Combine MapReduce result with data stackoverflow.comHow could i combine with map/reduce these two files: File1. Data. |
9. Implementing cross join in hadoop stackoverflow.comI am trying to implement cross join using hadoop in java. Both sides of the join are large enough that I can't keep any of them in memory. I have tried ... |
10. Is a collocated join (a-la-netezza) theoretically possible in hive? stackoverflow.comWhen you join tables which are distributed on the same key and used these key columns in the join condition, then each SPU (machine) in netezza works 100% independent of the ... |
11. Join vs COGROUP in PIG stackoverflow.comAre there any advantages (wrt performance / no of map reduces ) when i use COGROUP instead of JOIN in pig ? http://developer.yahoo.com/hadoop/tutorial/module6.html talks about the difference in ... |
12. How can I do this inner join properly in Apache PIG? stackoverflow.comI have two files, one called a-records |
13. How to do outer join on two columns in Pig Latin stackoverflow.comI do outer joins on single columns in Pig like this |