Many reasons... like broken disk, ram, any sort of hardware malfunction, just plain failure of namenode for any reason. Generally, I guess I should be stopping regionservers before namenode restart, at least I won't generate unflushed data.
-Jack On Tue, Oct 5, 2010 at 11:25 PM, Jonathan Gray <[email protected]> wrote: > Currently HBase cannot ride over an HDFS restart. > > Might be feasible in the future but not currently planned. Some of the > NameNode HA solutions might indirectly address this. > > Why is it that you need to restart your namenode? > >> -----Original Message----- >> From: Jack Levin [mailto:[email protected]] >> Sent: Tuesday, October 05, 2010 10:45 PM >> To: [email protected] >> Subject: stopping namenode and regionservers >> >> Hi, is it possible to tell regionservers not to die/stop when namenode >> is restarted? Every onces in a while I need to restart namenode, and >> it causes all regionservers pretty much to shutdown, and in many cases >> not cleanly, which causes long start up delays (hlog, etc). >> >> Thanks. >> >> -Jack >
