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[HBASE-6564] HDFS space is not reclaimed when a column family is deleted - HBase - [issue]
...When a column family of a table is deleted, the HDFS space of the column family does not seem to be reclaimed even after a major compaction....
http://issues.apache.org/jira/browse/HBASE-6564    Author: J Mohamed Zahoor, 2012-12-19, 09:14
Re: Scan exception when running MR - HBase - [mail # user]
...No Worries. It was a stray hbase jar that caused the problem.  ./zahoor  On 22-Oct-2012, at 10:43 PM, Bryan Beaudreault   wrote:  wrote: org.apache.hadoop.hbase.client.Sc...
   Author: J Mohamed Zahoor, 2012-10-23, 06:51
Re: Slow scanning for PrefixFilter on EncodedBlocks - HBase - [mail # user]
...+1 for making PrefixFIlter seek instead of using a startRow explicitly.  ./zahoor  On Thu, Oct 18, 2012 at 4:05 AM, lars hofhansl  wrote:  ...
   Author: J Mohamed Zahoor, 2012-10-18, 07:45
Re: DoubleColumnInterpretor for my coprocessor - HBase - [mail # user]
...After some dig up. it was some goof up with the jar file i loaded.. It works in both the case flawlessly now.  ./Zahoor  On 26-Sep-2012, at 3:35 PM, Julian Wissmann  wrote: &n...
   Author: J Mohamed Zahoor, 2012-10-02, 06:12
Re: HBASE garbage collection problem - HBase - [mail # user]
...Ignore the permgen advice.  Thought promotion failure as permgen failure.   ./zahoor  On 12-Sep-2012, at 8:39 PM, "Amlan Roy"  wrote:  ...
   Author: J Mohamed Zahoor, 2012-09-12, 15:21
Getting rid of -ROOT- Region - HBase - [mail # dev]
...Hi  I see that there were some discussions (HBASE-4524) in the past on getting rid of ROOT and storing the location of META on zk. People seem to agree on the topic also... is there any...
   Author: J Mohamed Zahoor, 2012-08-28, 05:25
Getting rid of -ROOT- - HBase - [mail # dev]
...Hi  I see that there were some discussions (HBASE-4524) in the past on getting rid of ROOT and storing the location of META on zk. People seem to agree on the topic also... is there any...
   Author: J Mohamed Zahoor, 2012-08-28, 05:23
Re: Using timestamps as "transaction ids" for idempotent counters. - HBase - [mail # user]
...Hi  One of the supported data type in HBase is "Counters". HTable already has a method called "incrementColumnValue", which atomically increments a column value. The lock is acquired at...
   Author: J Mohamed Zahoor, 2012-08-25, 16:45
Re: How to avoid stop-the-world GC for HBase Region Server under big heap size - HBase - [mail # user]
...Slab cache might help http://www.cloudera.com/blog/2012/01/caching-in-hbase-slabcache/  ./zahoor  On Thu, Aug 23, 2012 at 11:36 AM, Gen Liu  wrote:  ...
   Author: J Mohamed Zahoor, 2012-08-23, 06:16
Re: Using HBase serving to replace memcached - HBase - [mail # user]
...If you need to search row and column qualifiers you can pick  row+ col bloom  to help you skip blocks.  ./Zahoor@iPad  On 22-Aug-2012, at 10:58 PM, "Pamecha, Abhishek" &n...
   Author: J Mohamed Zahoor, 2012-08-23, 04:04
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