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Finding the latest updated rows - HBase - [mail # user]
...Hi, In HBase, the time stamp is set for each column, not for the entire row. If somehow I want to find the latest updated (put new row, or update only certain columns in some rows, etc) rows...
   Author: William Kang, 2014-01-21, 04:06
[expand - 1 more] - Re: HBase load distribution vs. scan efficiency - HBase - [mail # user]
...Hi James, Thanks for the link.  Does this mean that the system has to remember the prefix, and append the prefix to the original key before the scan starts?  If this is the case, i...
   Author: William Kang, 2014-01-21, 02:59
[expand - 2 more] - Re: Hbase 0.90.2 problems - HBase - [mail # user]
...Hi Harsh J, Thanks for your reply.  I will try the append version. But I already set HBase manage zookeeper. For some reason, it did not start it.   William  On Sat, Apr 9, 20...
   Author: William Kang, 2011-04-09, 18:45
[expand - 1 more] - Re: HBase random access in HDFS and block indices - HBase - [mail # user]
...Hi JG and Ryan, Thanks for the excellent answers.  So, I am going to push everything to the extremes without considering the memory first. In theory, if in HBase, every cell size equals...
   Author: William Kang, 2010-10-19, 03:21
Fwd: HBase random access in HDFS and block indices - HBase - [mail # user]
...Hi, Recently I have spent some efforts to try to understand the mechanisms of HBase to exploit possible performance tunning options. And many thanks to the folks who helped with my questions...
   Author: William Kang, 2010-10-19, 02:49
[expand - 1 more] - Re: More on Column Family versus Column - HBase - [mail # user]
...Hi Jacques, No. A block can certainly contain multiple rows.   William  On Mon, Oct 18, 2010 at 12:17 PM, Jacques  wrote: eone w may . te: g. e ion ek t this so 000...
   Author: William Kang, 2010-10-18, 19:43
Re: HBase cluster with heterogeneous resources - HBase - [mail # user]
...HDFS blocks are streaming files, which means you cannot random access those HDFS blocks quickly like other file systems. So that means if your HBase block is in the middle of a HDFS block, y...
   Author: William Kang, 2010-10-16, 19:30
[expand - 2 more] - Re: Help needed! Performance related questions - HBase - [mail # user]
...Hey J-D, Thanks a lot! That has cleared a lot of my confusions. :) I really appreciate it.   William   On Thu, Oct 14, 2010 at 2:51 PM, Jean-Daniel Cryans  wrote:...
   Author: William Kang, 2010-10-14, 19:44
[expand - 4 more] - Re: Limits on HBase - HBase - [mail # user]
...So, basically, there is no limit for row as long as a single row does not go beyond the region server's storage capacity? And why the cell size should not be larger than 20M? Dose the data b...
   Author: William Kang, 2010-10-13, 08:31
[expand - 1 more] - Re: Number of column families vs Number of column family qualifiers - HBase - [mail # user]
...Hi Ryan, Thanks for your reply. So, even if I use get.addColumn(byte[] family, byte[] qualifier) for  a certain cell, the HBase will have to traverse from the beginning of the column fa...
   Author: William Kang, 2010-10-13, 08:03
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB