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Re: column based or row based storage for HBase? - HBase - [mail # user]
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...In my understanding of column-oriented structure of hbase, the first thing is the term column-oriented. The meaning is that the data which belongs to the same column family stores continuous...
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Author: yonghu,
2012-08-06, 03:37
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Re: Why Hadoop can't find Reducer when Mapper reads data from HBase? - HBase - [mail # user]
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...Strage thing is the same program works fine in the cluster. By the way, also in pseudo mode when MapReduce read data from Cassandra in Map phase and transferred to Reduce phase, the sa...
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Author: yonghu,
2012-07-13, 05:45
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Why Hadoop can't find Reducer when Mapper reads data from HBase? - HBase - [mail # user]
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...Hello, I tried the program as follows: public class MRTableAccess { static class MRTableMapper extends TableMapper{ private Text rowInfor = new Text(); private Text column =...
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Author: yonghu,
2012-07-12, 11:15
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Re: HBase RegionServer can't connect to Master - HBase - [mail # user]
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...I think you can also use ifconfig command in the VM to see the ip address. And then you can change your ip address in /etc/hosts. Regards! Yong On Wed, May 2, 2012 at 7:21 ...
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Author: yonghu,
2012-05-04, 08:00
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Re: Hbase custom filter - HBase - [mail # user]
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...It means that java run time can't find org/apache/hadoop/hbase/filter/FilterBase class. You have to add the hbase.jar in your classpath. regards! Yong On Wed, May 2, 2012 a...
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Author: yonghu,
2012-05-02, 11:45
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Re: Are minor compaction and major compaction different in HBase 0.92? - HBase - [mail # user]
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...Thanks for your reply. I install HBase in pseudo-mode. I think my situation is that the minor compaction promotes to major compaction. I have 3 HFiles for table 'test' in one RegionSer...
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Author: yonghu,
2012-04-27, 08:28
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Are minor compaction and major compaction different in HBase 0.92? - HBase - [mail # user]
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...Hello, My HBase version is 0.92.0. And I find that when I use minor compaction and major compaction to compact a table, there are no differences. In the minor compaction, it will remov...
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Author: yonghu,
2012-04-26, 06:48
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Re: Problem to Insert the row that i was deleted - HBase - [mail # user]
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...As Lars mentioned, the row is not physically deleted. The way which Hbase uses is to insert a cell called "tombstone" which is used to mask the deleted value, but value is still there (if th...
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Author: yonghu,
2012-04-25, 08:10
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Re: HBase 0.92 with Hadoop 0.22 - HBase - [mail # user]
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...yes. You can compile the hadoop jar file by yourself and put into the Hbase lib folder. Regards! Yong On Mon, Apr 16, 2012 at 2:09 PM, Harsh J wrote:...
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Author: yonghu,
2012-04-16, 12:20
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Re: Is it possible to install two different Hbase versions in the same Cluster? - HBase - [mail # user]
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...Mike, Can you explain why I can't put the RS on the same node? Thanks! Yong On Mon, Apr 16, 2012 at 1:33 PM, Michel Segel wrote:...
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Author: yonghu,
2012-04-16, 11:39
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