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Why use "Reverse Timestamp" as the Row Key? - Hadoop - [mail # user]
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...Hi, I was studying Hbase with "Hadoop: The Definitive Guide". There was a schema example that had as the row key, "Group Id + Reverse Timestamp." This way the same groups will be located nea...
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Author: edward choi,
2011-07-22, 07:18
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TableOutputFormat not efficient than direct HBase API calls? - Hadoop - [mail # user]
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...Hi, I am writing an Hadoop application that uses HBase as both source and sink. There is no reducer job in my application. I am using TableOutputFormat as the OutputFormatC...
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Author: edward choi,
2011-06-22, 02:22
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Re: Custom TableInputFormat not working correctly - Hadoop - [mail # user]
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...Hello, St.Ack I found the reason at last on 3:00 am last night. org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob() is hardcoded to select "TableInputFormat.class...
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Author: edward choi,
2011-06-21, 00:10
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Custom TableInputFormat not working correctly - Hadoop - [mail # user]
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...Hi, I have implemented a custom TableInputFormat. I call it TableInputFormatMapPerRow and that is exactly what it does. The getSplits() of my custom TableInputFormat creates a TableSpl...
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Author: edward choi,
2011-06-19, 15:49
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How to split a specified number of rows per Map - Hadoop - [mail # user]
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...Hi, I am using HBase as a source of my MapReduce jobs. I recently found out that TableInputFormat automatically splits the input table so that each region of the table will be as...
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Author: edward choi,
2011-06-05, 11:04
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hbase and hypertable comparison - Hadoop - [mail # user]
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...I'm planning to use a NoSQL distributed database. I did some searching and came across a lot of database systems such as MongoDB, CouchDB, Hbase, Cassandra, Hypertable, etc. Since what...
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Author: edward choi,
2011-05-25, 07:47
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Inserting many small files into HBase - Hadoop - [mail # user]
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...Hi, I'm planning to crawl thousands of news rss feeds via MapReduce, and save each news article into HBase directly. My concern is that Hadoop does not work well with a large num...
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Author: edward choi,
2011-03-21, 01:39
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Does HBase use spaces of HDFS? - Hadoop - [mail # user]
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...Sorry for this totally newbie question. I'm just wondering if HBase uses HDFS space. I read it in the reference book that HBase table size increases automatically as the table en...
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Author: edward choi,
2011-03-08, 05:42
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Inserting data directly into HBase? - Hadoop - [mail # user]
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...Hi, I am trying to crawl several thousands of rss feeds every 30 minutes. I thought I could use Hadoop and HBase as my platform. However, I am not familiar with the HBase a...
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Author: edward choi,
2011-03-01, 11:28
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Re: How to make a CGI with HBase? - Hadoop - [mail # user]
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...Wow thanks for the tip. I could definitely use that. Just like you said, I am trying to do one at a time :) Thanks Lance. 2011년 3월 1일 오후 2:06, Lance Norskog 님의 말: you e e n...
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Author: edward choi,
2011-03-01, 09:26
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