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Re: Hbase scalability performance - HBase - [mail # user]
...Note that adding nodes will improve throughput and not latency. So, if your client application for benchmarking is single threaded, do not expect an improvement in number of reads per second...
   Author: Varun Sharma, 2012-12-22, 16:50
Re: recommended nodes - HBase - [mail # user]
...Hmm, I thought that RAID0 simply stripes across all disks. So if you got 4 disks - an HFile block for example could get striped across 4 disks. So to read that block, you would need all 4 of...
   Author: Varun Sharma, 2012-12-20, 21:37
[HBASE-7313] ColumnPaginationFilter should reset count when moving to NEXT_ROW - HBase - [issue]
...ColumnPaginationFilter does not reset count to zero on moving to next row. Hence, if we have already gotten "limit" number of columns - the subsequent rows will always return 0 columns....
http://issues.apache.org/jira/browse/HBASE-7313    Author: Varun Sharma, 2012-12-19, 06:06
Publishing Hbase thrift metrics - HBase - [mail # user]
...Hi,  I am trying to publish hbase thrift2 metrics to ganglia on hbase-0.94.3 - I have modified the "hadoop-metrics.properties" to have the correct GMETAD IP. I can get metrics for the r...
   Author: Varun Sharma, 2012-12-18, 18:52
Re: Filtering/Collection columns during Major Compaction - HBase - [mail # user]
...Hi Lars,  Thanks for the detailed tip - we will go down that path. Looking at the javadoc for InternalScanner.next() - it says grab the next row's values - is this rows in the hbase sen...
   Author: Varun Sharma, 2012-12-12, 00:51
Re: Does HBase combine multiple Puts against the same region server? - HBase - [mail # user]
...The code does the the following:  1) Add put to buffer 2) If buffer is > size (2MB) - then flush the puts 3) Finally, for the left over puts in the buffer - if auto flush if on (whic...
   Author: Varun Sharma, 2012-12-06, 19:24
Re: .META. region server DDOSed by too many clients - HBase - [mail # user]
...I see - I am going to try the patch then - looks like all the threads have deadlocked and are holding the lock to the same block integer. The cache hit ratio is pretty high. Also the server ...
   Author: Varun Sharma, 2012-12-06, 11:29
Re: Long row + column keys - HBase - [mail # user]
...Hi Anoop,  I agree - I am not so concerned about the savings on disk - rather I am thinking about the savings inside the block cache. I am not sure how stable PrefixDeltaEncoding is and...
   Author: Varun Sharma, 2012-12-04, 05:48
Re: HTablePool dead locks/freezing - HBase - [mail # user]
...Okay - this was contention issue - https://issues.apache.org/jira/browse/HBASE-2939 solves the issue - upping the IPC pool size. Thanks !  On Mon, Dec 3, 2012 at 8:04 PM, Varun Sharma &...
   Author: Varun Sharma, 2012-12-04, 04:42
Re: Region server deadlocks in master master replication - HBase - [mail # user]
...Hi Jean,  I looked at the release notes for 0.94.1 and 0.94.2 and it looks like all the fixes there have to do with splitting of regions (I maybe wrong). For my cluster(s), splits are o...
   Author: Varun Sharma, 2012-11-30, 18:08
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