Hi Can you see if this helps..
http://hbase.apache.org/book/performance.html ./zahoor On Mon, Aug 13, 2012 at 10:28 AM, 某因幡 <[email protected]> wrote: > Hi, I'm new to HBase. > I'm working with Hadoop-1.0.3 and HBase 0.92.1. > I have 8 data nodes which also work as region servers. > And I'm trying to import my data into HBase. > I wrote two programs, one is using HBase client API(auto flush is off, > WAL is on, multi-threaded) and the other is using HBase MR like the > Uploader example. > Row key is a combination of several meaningful fields and a hash in > the end, about 40 bytes or so. > Each row is consist of several columns. There is only 2 column > families. Average raw data of a row is less than 200 bytes. > The one using client API is about 10,000 rows written per second, > while the MR one is extremely slow, about 4~5 times slower. > This is measured after a major compaction. > Why the writing speed is so slow? Can someone help me. > > -- > language: Chinese, Japanese, English >
