1. Can I get invidually sorted Mapper outputs from Hadoop when using zero Reducers? stackoverflow.comI have a job in Hadoop 0.20 that needs to operate on large files, one at a time. (It's a pre-processing step to get file-oriented data into a cleaner, line-based ... |
2. Sorting large data using MapReduce/Hadoop stackoverflow.comI am reading about MapReduce and the following thing is confusing me. Suppose we have a file with 1 million entries(integers) and we want to sort them using MapReduce. The way i ... |
3. Sort and shuffle optimization in Hadoop MapReduce stackoverflow.comI'm looking for a research/implementation based project on Hadoop and I came across the list posted on the wiki page - http://wiki.apache.org/hadoop/ProjectSuggestions. But, this page was last updated in ... |
4. Running the Sort example on Hadoop (single-node cluster) stackoverflow.comI have installed |
5. MapReduce (secondary) sorting / filtering - how? stackoverflow.comI have a logfile of timestamped values (concurrent users) of different "zones" of a chatroom webapp in the format "Timestamp; Zone; Value". For each zone exists one value per minute of ... |
6. Hadoop running sort example on single-node cluster stackoverflow.comI am trying to run sort example on Hadoop single-node cluster. First of all, I start the deamons:
|
7. Hadoop MapReduce with already sorted files stackoverflow.comI'm working with Hadoop MapReduce. I've got data in HDFS and data in each file is already sorted. Is it possible to force MapReduce not to resort the data after map ... |
8. How to sort (order by) big data with hive efficiently? stackoverflow.comI want to sort a big dataset efficiently (i.e. with a custom partitioner, like described here: How does the MapReduce sort algorithm work?), but I want to do it with ... |
9. Using sorted tables in Hive stackoverflow.comIn summary: I feel that my system is ignoring the concept of pre-sorted tables. - I expected to save time on the sorting step because I was using pre-sorted data, but the query plan ... |
10. The right place for "io.sort.mb" in Hadoop? stackoverflow.comI am a bit confused, in the Hadoop cluster setup, in section "Real-World Cluster Configurations", an example is given where properties like io.sort.mb & io.sort.factor goes in core-site.xml. But ... |
11. MapReduce sorted iterator stackoverflow.comI am reading the source code of MapRedcue to gain more understanding MapReduce's internal mechanism. And I have problem when trying to understand how data produced in map phase are merged ... |
12. Hadoop combiner sort phase stackoverflow.comWhen running a MapReduce job with a specified combiner, is the combiner run during the sort phase? I understand that the combiner is run on mapper output for each spill, but ... |
13. Sorting by value in Hadoop from a file stackoverflow.comI have a file containing a String, then a space and then a number on every line. Example: |