It is enough for you to know whice Dirctory in the HDFS contain your index datat rather than whice datanode.
2008/9/6, Jean-Daniel Cryans <[EMAIL PROTECTED]>: > > Hi, > > I suggest that you read how data is stored in HDFS, see > http://hadoop.apache.org/core/docs/r0.18.0/hdfs_design.html > > J-D > > On Sat, Sep 6, 2008 at 12:11 AM, ZhiHong Fu <[EMAIL PROTECTED]> wrote: > > > hello. I'm a new user to hadoop. and Now I hava a problem in > understanding > > Hdfs. > > In such a scene. I have several databases and want to index them. So > > when > > I map indexing database, I have to control which database index was > stored > > in which datanode. So when database updated, The index can be updated > > correspondely. > > So how can i get to do this? thanks > > > -- Sorry for my englist!! 明
