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From aiyoh79 <tcheng...@gmail.com>
Subject Hbase Compression
Date Tue, 24 Sep 2013 10:50:34 GMT
Hi,

I am using hbase 0.94.11 and i feel a bit confuse when looking at the log
file below:

13/09/24 13:11:00 INFO regionserver.Store: Flushed , sequenceid=687077,
memsize=
122.1m, into tmp file
hdfs://192.168.123.123:54310/hbase/usertable/b19289cf9b1400
c6daddc347337bac03/.tmp/13f0d91efe784372a796585a6c1e05d3
13/09/24 13:11:00 INFO regionserver.Store: Added
hdfs://192.168.123.123:54310/hba
se/usertable/b19289cf9b1400c6daddc347337bac03/family/13f0d91efe784372a796585a6c1
e05d3, entries=432620, sequenceid=687077, filesize=64.4m
13/09/24 13:11:00 INFO regionserver.HRegion: Finished memstore flush of
~128.2m/
134402240, currentsize=48.0m/50366240 for region
usertable,user4\xB4\xB0,1379998
895119.b19289cf9b1400c6daddc347337bac03. in 1163ms, sequenceid=687077,
compactio
n requested=false

It seems like it will first flush into a tmp file and the memsize is 122.1m,
but when it finally added, the size is 64.4m. Lastly, there are 2 more
parameters which is 128.2m and 48.0m for currentsize.

I never specify hbase.regionserver.codecs preperty in my hbase-site.xml
file, so is the size difference still because of compression?

Thanks,

aiyoh79  



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