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[expand - 2 more] - Re: How to speedup Hbase query throughput - HBase - [mail # user]
...I think i traced this to a bug in my compaction scheduler that would have missed scheduling about half the regions, hence the 240gb vs 480gb.  To confirm: major compaction will always r...
   Author: Matt Corgan, 2011-05-19, 19:41
Re: GC and High CPU - HBase - [mail # user]
...Isn't a 20mb young generation pretty small these days?  For a 4gb heap, you might want to try giving 5-10% of it to the young generation by setting  -XX:NewSize=256M  Some of ...
   Author: Matt Corgan, 2011-05-17, 14:27
[expand - 1 more] - Re: heap memory allocation - HBase - [mail # user]
...J-D - yes, I think that increasing block size by 4x would cut the index size by 4x, assuming 1 index entry per block.  Random reads are not as important for this table, and tend to cach...
   Author: Matt Corgan, 2011-04-15, 17:15
Re: Row Counters - HBase - [mail # user]
...Jeff,  The problem is that when hbase receives a put or delete, it doesn't know if the put is overwriting an existing row or inserting a new one, and it doesn't know if whether the requ...
   Author: Matt Corgan, 2011-03-16, 20:59
Re: Long client pauses with compression - HBase - [mail # user]
...I've run into this problem and mitigated it by setting the memstore flush size to 256mb, but i'm curious why flushing an uncompressed file would help the situation?  Also, would there b...
   Author: Matt Corgan, 2011-03-15, 16:26
Re: what's the roadmap of secondary index of hbase? - HBase - [mail # dev]
...I was wondering if it wouldn't be simpler to start with the synchronous version of secondary indexes.  It's more complex at the time of the Put, but at least you don't have to worry abo...
   Author: Matt Corgan, 2011-03-01, 21:44
Re: question about long column family name and column name - HBase - [mail # user]
...The full row name, column family name, and column qualifier are stored with every cell (called a KeyValue).  Using gzip or lzo compression can greatly reduce the size of the data stored...
   Author: Matt Corgan, 2011-01-26, 18:08
Re: many 'Got brand-new compressor' messages in region server log - HBase - [mail # dev]
...That happened to me when using GZ compression without the native compression libraries installed properly.  You must add them to hbase .90 manually.  Without them it uses the pure-...
   Author: Matt Corgan, 2011-01-23, 02:59
[expand - 2 more] - Re: delete using server's timestamp - HBase - [mail # user]
...Ah - i see.  I didn't notice the difference between KeyValue.Type.Delete and KeyValue.Type.DeleteColumn.  Sorry about that, Matt   On Fri, Jan 21, 2011 at 8:24 PM, Ryan Rawson...
   Author: Matt Corgan, 2011-01-22, 01:33
Re: Enable Compression on a Table - HBase - [mail # user]
...Another issue is that hbase doesn't currently merge small regions together.  After doing something similar, my regions shrank from 125mb to 5mb (large prefixes), and since it's time ser...
   Author: Matt Corgan, 2011-01-19, 01:20
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