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Could it improve read performance by storing HFile consecutive on disk? - HBase - [mail # user]
...In our use case memory/cache is small, and we want to improve read/load (from-disk) performance by storing HFile blocks consecutively on disk... The idea is that if we store blocks more clos...
   Author: yun peng, 2013-07-09, 15:49
Any mechanism in Hadoop to run in background - HBase - [mail # user]
...Hi, All... We have a user case intended to run Mapreduce in background, while the server serves online operations. The MapReduce job may have lower priority comparing to the online jobs.. &n...
   Author: yun peng, 2013-06-22, 14:55
Re: difference between major and minor compactions? - HBase - [mail # user]
...I am more concerned with CompactionPolicy available that allows application to manipulate a bit how compaction should go... It looks like  there is newest API in .97 version *ExploringC...
   Author: yun peng, 2013-06-22, 14:35
Re: Possibility of using timestamp as row key in HBase - HBase - [mail # user]
...Thanks Asaf and Anoop.  You are right, data in Memstore is already sorted so flush() would not block too much with current write stream to another Memstore...  But wait,,,, flush()...
   Author: yun peng, 2013-06-21, 15:38
Re: Hbase write stream blocking and any solutions? - HBase - [mail # user]
...thanks lars for the insights. I guess current hbase may have to block write stream even when data write rate does not reach the limit of IO subsystems. Blocking happen because of the compact...
   Author: yun peng, 2013-06-10, 02:17
Re: How does BlockCache find relevant Blocks? - HBase - [mail # user]
...Thanks for the clarification, and I am interested in knowing a bit deep...  So how does hbase maintains which block is in memory and which is not. is there an extra level of index (like...
   Author: yun peng, 2013-05-29, 12:07
What is in BlockCache? - HBase - [mail # user]
...Hi, All, I am wondering what is exactly stored in BlockCache: Is it the same raw blocks as in HFile? or does HBase merge several raw blocks and store the merged block in cache to serve futur...
   Author: yun peng, 2013-05-20, 12:07
Re: How practical is it to add a timestamp oracle on Zookeeper - HBase - [mail # user]
...Hi, Jean and Jieshan, Are you saying client can directly contact region servers? Maybe I overlooked, but I think the client may need lookup regions by first contacting Zk as in figure 8-11 f...
   Author: yun peng, 2013-04-16, 12:40
Re: On source code of File Section mechanism in minor compaction - HBase - [mail # user]
...Hi Ted, thanks a lot for the reference.  Ted and All, I have additional minor question though. Would a flush in HBase cause cascaded minor compaction? To be more specific, when a minor ...
   Author: yun peng, 2013-04-11, 19:24
How HBase perform per-column scan? - HBase - [mail # user]
...Hi, All, I want to find all existing values for a given column in a HBase, and would that result in a full-table scan in HBase? For example, given a column C, the table is of very large numb...
   Author: yun peng, 2013-03-09, 19:11
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