Thats interesting to hear. Keep us posted.
HBase asks the filesystem if its in safe mode and if it is, it parks
itself. Here is code from master:
if (this.fs instanceof DistributedFileSystem) {
// Make sure dfs is not in safe mode
String message = "Waiting for dfs to exit safe mode...";
while (((DistributedFileSystem) fs).setSafeMode(
FSConstants.SafeModeAction.SAFEMODE_GET)) {
LOG.info(message);
try {
Thread.sleep(this.threadWakeFrequency);
} catch (InterruptedException e) {
//continue
}
}
}
Then there is hbase's notion of safemode. It will be in safe mode until it
does initial scan of catalog tables. The master keeps a flag in zookeeper
while its in safemode so regionservers are aware of the state:
public boolean inSafeMode() {
if (safeMode) {
if(isInitialMetaScanComplete() && regionsInTransition.size() == 0 &&
tellZooKeeperOutOfSafeMode()) {
master.connection.unsetRootRegionLocation();
safeMode = false;
LOG.info("exiting safe mode");
} else {
LOG.info("in safe mode");
}
}
return safeMode;
}
Have you seen the .META. and -ROOT- deploy to regionservers? Have you seen
that these regions being scanned in the master log? (Enable DEBUG if not
already enabled).
Yours,
ST.Ack
On Wed, Oct 7, 2009 at 10:06 AM, Ananth T. Sarathy <
[email protected]> wrote:
> We have been running Hbase on a s3 filesystem. It's the hbase regionserver,
> not HDFS since we are using s3. We haven't felt like it's been too slow,
> though the amount of data we are pushing isn't sufficiently large enough to
> notice yet.
> Ananth T Sarathy
>
>
> On Wed, Oct 7, 2009 at 12:47 PM, stack <[email protected]> wrote:
>
> > HBase or HDFS is in safe mode. My guess is that its the latter. Can
> you
> > figure from HDFS logs why it won't leave safe mode? Usually
> > under-replication or a loss of a large swath of the cluster will flip on
> > the
> > safe-mode switch.
> >
> > Are you trying to run HBASE on an S3 filesystem? An HBasista tried it in
> > the past and, FYI, found it insufferably slow. Let us know how it goes
> for
> > you.
> >
> > Thanks,
> > St.Ack
> >
> > On Wed, Oct 7, 2009 at 9:33 AM, Ananth T. Sarathy <
> > [email protected]> wrote:
> >
> > > my regionserver has been stuck in safemode. What can i do to get it
> out
> > > safemode?
> > >
> > > Ananth T Sarathy
> > >
> >
>
