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[expand - 1 more] - Re: Question on the number of column families - HBase - [mail # user]
...You could narrow the number of rows to scan by using Filters. I don'tthink, you could reach/optimize to column level I/O.Block Cache is related to actual data read from HDFS per column famil...
   Author: Alok Kumar, 2014-08-05, 12:26
Re: Hbase scans taking a lot of time - HBase - [mail # user]
...Vibhav,  Hive submits a map-reduce job to hdfs cluster.* How many node cluster you have?*  taking  Do you have 'order by' or 'group by' clause in you query? Queries take longe...
   Author: Alok Kumar, 2013-01-26, 06:07
Re: how to get the record number from hbase - HBase - [mail # user]
...Hi,  See here https://blogs.apache.org/hbase/entry/coprocessor_introduction for Coprocessor Introduction. It's the first place you should look for . It has couple of example as well &nb...
   Author: Alok Kumar, 2013-01-05, 07:47
Re: Retrieving rows with specific values using SinglieColumnValueFilter - HBase - [mail # user]
...Hi,  You have set MUST_PASS_ALL. which mean both (filter1 && filter2) must be true on any single row, And it ll never happen(both condition true), that's why it is not fetching any resu...
   Author: Alok Kumar, 2012-10-16, 19:08
[expand - 1 more] - Re: HBase Replication : Do I need to create table programmatically on Replica Cluster? - HBase - [mail # user]
...Thank You JD. Now I can update my codebase accordingly.  -Alok  On Wed, Jul 25, 2012 at 8:28 PM, Jean-Daniel Cryans  wrote:...
   Author: Alok Kumar, 2012-07-25, 16:48
Re: Hbase bkup options - HBase - [mail # user]
...Hello everyone,  I too have similar use-case, where I've setup a separate HBase Replica Cluster. and enabled 'Replciation_Scope' for tables.  Q. Do I need to create 'table + ColFam...
   Author: Alok Kumar, 2012-07-23, 16:24
Re: HBase Cannot Start Again After Sudden Power-Off - HBase - [mail # user]
...hi,  you should try looking into log dir ( $HBASE_HOME/logs ), look for HMaster logs in "hbase--master-.log files.  It'll tell you exact region why HBase is not coming up.. or try ...
   Author: Alok Kumar, 2012-07-22, 11:52
Re: Hbase Replication - HBase - [mail # user]
...Hi All,  We are going to setup two clusters(Master-Slave) for disaster recovery. If Custer1 goes down.. HBase client will connect to Slave Custer2, then I can use copyTable command to u...
   Author: Alok Kumar, 2012-06-23, 11:32
Re: : question on filters - HBase - [mail # user]
...Hi,  try creating a FilterList and attach it to scan object. A FilterList may contain any number of filters, with MUSTPASS.ALL or MUSTPASS.ONE condition. This way  scan.setFilter(y...
   Author: Alok Kumar, 2012-05-25, 18:52
Re: improve performance of a MapReduce job with HBase input - HBase - [mail # user]
...Hi,  you can make use of 'setCaching' method of your scan object.  Eg: Scan objScan = new Scan(); objScan.setCaching(100); // set it to some integer, as per ur use case.  http...
   Author: Alok Kumar, 2012-05-25, 18:24
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