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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/PerformanceEvaluation" by stack
Date Sat, 17 Jan 2009 06:15:18 GMT
Dear Wiki user,

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The following page has been changed by stack:
http://wiki.apache.org/hadoop/Hbase/PerformanceEvaluation

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  Of note, the mapfile numbers are less than those of hbase when writing because the mapfile
tests write one file whereas hbase after first split is writing to multiple files concurrently.
 On the other hand, hbase random read is very like mapfile random read, at least in single
client case; we're effectively asking the filesystem for a random value from the midst of
a file in both cases.  The mapfile numbers are useful as guage of how much hdfs has come on
since the last time we ran PE.
  
- Block compression is a little slower writing, way slower random-reading but about same scanning.
+ Block compression (zlib -- hbase bug won't let you specify lzo) is a little slower writing,
way slower random-reading but about same scanning.
  
  Will post a new state, 8 concurrent clients, in a while so we can start tracking how we
are doing when contending clients.
  

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