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Re: Slow Get Performance (or how many disk I/O does it take for one non-cached read?) - HBase - [mail # user]
...Actually there are 2 read aheads in linux (from what I learned last time, Idid benchmarking on random reads). One is the filesystem readahead whichlinux does and then there is also a disk le...
   Author: Varun Sharma, 2014-02-02, 19:03
[expand - 6 more] - Re: Sporadic memstore slowness for Read Heavy workloads - HBase - [mail # dev]
...Ohk I think I understand this better now. So the order will actually be,something like this, at step #3(ROW, , T=2)(ROW, COL1, T=3)(ROW, COL1, T=1)  - filtered(ROW, COL2, T=3)(ROW, COL2...
   Author: Varun Sharma, 2014-01-28, 17:44
[expand - 4 more] - Re: Balancer switch runs causing problems - HBase - [mail # dev]
...But continue to see reads on META - no idea why ?On Mon, Jan 27, 2014 at 8:52 PM, Varun Sharma  wrote:> We are not seeing any balancer related logs btw anymore...>>> On Mon,...
   Author: Varun Sharma, 2014-01-28, 04:57
Question about the HBase thrift server - HBase - [mail # user]
...Hi everyone,  I have a question about the hbase thrift server and running scans in particular. The thrift server maintains a map of  -> ResultScanner(s). These integers are pass...
   Author: Varun Sharma, 2013-12-07, 05:17
[expand - 1 more] - Re: Next big thing for HBase - HBase - [mail # dev]
...I think I sent that too early - I could buy the results for the HDD comparison but I dont buy the Fusion I/O comparison at all. I have been able to push it much much more on SSD(s) on EC2. I...
   Author: Varun Sharma, 2013-11-27, 17:55
[expand - 1 more] - Re: Question about hbase.rpc.timeout - HBase - [mail # user]
...I am looking through the code - it seems like HConnectionImplementation keeps rpcTimeout as a class variable. I thought there is a single HConnection object and there is a factory of some Co...
   Author: Varun Sharma, 2013-11-11, 21:09
[expand - 1 more] - Re: ColumnPaginationFilter called twice per line? - HBase - [mail # dev]
...Not really - IIRC, ColumnPaginationFilter was broken prior to this fix - it was doing some incorrect version counting and it had to do with the way version tracking and filtering was entangl...
   Author: Varun Sharma, 2013-10-18, 22:15
[expand - 1 more] - Re: Regarding QoS for Handlers - HBase - [mail # dev]
...Or a slightly alternative approach would be to have a CallQueue implementation which is more of a priorityQueue.  The Queue wrapper has a number of different queues [TableName:RpcName] ...
   Author: Varun Sharma, 2013-10-13, 20:54
Re: HBase Random Read latency > 100ms - HBase - [mail # user]
...How many reads per second per region server are you throwing at the system - also is 100ms the average latency ?   On Mon, Oct 7, 2013 at 2:04 PM, lars hofhansl  wrote:  ...
   Author: Varun Sharma, 2013-10-08, 19:14
[expand - 2 more] - Re: Is there a problem with having 4000 tables in a cluster? - HBase - [mail # user]
...Okay, thanks for the explanation. You can hash or salt (as many people say) the keys to avoid the hot spotting problem. What this means is that you push the part that issues filtered range q...
   Author: Varun Sharma, 2013-09-25, 04:55
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