row « hbase « Java Database Q&A





1. facing problems while updating rows in hbase    stackoverflow.com

Hello i've just started exploring hbase i've run samples : SampleUploader,PerformanceEvaluation and rowcount as given in hadoop wiki: http://wiki.apache.org/hadoop/Hbase/MapReduce The problem im facing ...

2. Sequential Row IDs in Column Oriented DBs (HBase, Cassandra)?    stackoverflow.com

I've seen two contradictory pieces of advice when it comes to designing row IDs in HBase, (specifically, but I think it applies to Cassandra as well.)

  1. Group keys that you'll be aggregating ...

3. Will HBase store column families for the same row in different machine?    stackoverflow.com

Column families for the same row belong to the same RegionServer. So, the question here is will a RegionServer store different column families in different machine?

4. Efficient way to delete multiple rows in HBase    stackoverflow.com

Is there an efficient way to delete multiple rows in HBase or does my use case smell like not suitable for HBase? There is a table say 'chart', which contains items that ...

5. create table in hbase    stackoverflow.com

i am new to hbase and hadoop. Any how i have succeeded in setting up a hadoop cluster which consists of 3 machines. Now i need some help on building up ...

6. how to list all row keys in an hbase table?    stackoverflow.com

Can anybody tell me, how to list all row keys in an hbase table?

7. How to list all row keys in an hbase table?    stackoverflow.com

How do I list all row keys in an hbase table? I need to do this using PHP with a REST interface.

8. Passing multiple rows of HBase (based on condition) as as input to Map task of mapreduce    stackoverflow.com

Hello everyone I have a system which collects statistics data from two disparate systems(each generated with its own timestamp). The data from source1 is stored in Hbase table tbl in column A, ...

9. Get HBase Row Keys in Range without Retrieving Data?    stackoverflow.com

Is there a way to retrieve the row keys in a given range without actually retrieving the columns/CFs associated with that row key? For clarification: In my example, our table's ...





10. HBase: How to delete rows using Map-Reduce    stackoverflow.com

I want to know how to delete specific rows in HBase using Map-Reduce?

11. How does HBase deletes rows?    stackoverflow.com

I have read in HBase Book that it's now possible to delete rows from table.
How does it exactly works? Is this data moved somewhere for later deletion? HBase ...

12. How does HBase guarantee row level atomicity?    stackoverflow.com

Considering the fact that HBase stores each column family in a separate HFile and the fact that a row can span many Column Families. How does HBase ensure that a put/delete ...

13. HBase copy one row (rename row key) in Java    stackoverflow.com

I know in HBase, the key of the row can not be changed. But I really need a row key rename function. How can I copy one row to another row ...

14. HBql :: Any tips on how to limit query based on row ID?    stackoverflow.com

Thanks for reading this one =) I'm trying to figure out how to figure out how to limit query in HBql based on row ID. I've spent hours, looking up to see ...

15. Where does HBase store all the row keys?    stackoverflow.com

I am working on hbase. I have some questions:

  1. Where does HBase store the row key? Is it in the memory of each region server? Or on the disk?
  2. If my row keys ...

16. Hbase. Sequential column reading in the big row. Is it possible?    stackoverflow.com

I use HBase in a single-node mode. My rows in the table are huge. I have to read sequentially all columns in all rows using Java API. But Get and Scan ...





17. why so slow when I insert row with many columns into HBase?    stackoverflow.com

I want to insert data into HBase from database, but One row with many columns(more than fifty, there is only one column family). And I have 4 region servers, but the performance of ...

18. HBase scan with compare filters has long delay when returning last row    stackoverflow.com

I have HBase running in standalone mode and encountered some problems when I query the tables using the Java API. The table has several million entries (but might grow to billions) which ...

19. Should the MapReduce job kicked off by HBase shell to count table rows be visible in the JobTracker?    stackoverflow.com

The HBase shell help for the count command states: Count the number of rows in a table. This operation may take a LONG time (Run '$HADOOP_HOME/bin/hadoop jar hbase.jar rowcount' to run a counting mapreduce ...

20. How to use "multiple AND in columns" to filter the row in hbase?    stackoverflow.com

The scenario like this: In a hbase table, there are different columns for different rows, e.g.: row1 have columns fm:a, fm:b, fm:c row2 have columns fm:a, fm:d So I want to use a scan to ...

21. HBase Row names    stackoverflow.com

Im a new HBase user and could not understand it well yet. I have some doubts about the row index generation:

  1. What is the correct/best way to generate a row name/index for ...

22. What is the most network efficient method of fetching a set of rows in HBase?    stackoverflow.com

Say that I have a set of row keys (as a Set). What is the most network efficient method of fetching a particular column family for this set of rows ? ...

24. Retrieving timestamp from hbase row    stackoverflow.com

Using Hbase API (Get/Put) or HBQL API, is it possible to retrieve timestamp of a particular column?