The loggers will write to local disk, however, the TabletServer will write out files to HDFS during major and minor compactions.
I don't know how complex the tablet assignment algorithm is, but it's safe to assume that if your tablet spans multiple HDFS blocks, a TServer will, in all likelihood, only be hosting 1 HDFS block of a given tablet at any given time, and do fetches for other HDFS (and RFile) blocks as the need arises. There is a caching mechanism for holding on to RFile blocks. On Mon, Jun 25, 2012 at 10:13 AM, Cardon, Tejay E <[email protected]> wrote: > All, > > If I understand things correctly, when an Accumulo tablet > server writes data, things are organized such that those writes go to the > local disk (ie each tablet server writes and reads data to/from the disk > local to that server). Is this correct? And if so, then is it correct to > assume that every tablet server should run on an HDFS data node? Or am I > completely off base here? > > > > Thanks, > > Tejay Cardon
