Could we able to find the root cause?
On Thu, May 9, 2013 at 11:28 AM, lars hofhansl <la...@apache.org> wrote: > Good news is that as far as I can tell no data was lost. > Eventually all logs were split and replayed. > > > -- Lars > > > > ----- Original Message ----- > From: lars hofhansl <la...@apache.org> > To: HBase Dev List <dev@hbase.apache.org> > Cc: > Sent: Thursday, May 9, 2013 11:13 AM > Subject: Re: All region server died due to "Parent directory doesn't exist" > > Thanks Stack. > > I sent the logs. > Also, I have since bounced HDFS and ZK and the problem is gone now (I can > start RSs again and they stay up). Something got into a weird state. > > > -- Lars > > > > ________________________________ > From: Stack <st...@duboce.net> > To: HBase Dev List <dev@hbase.apache.org>; lars hofhansl <la...@apache.org > > > Sent: Thursday, May 9, 2013 10:34 AM > Subject: Re: All region server died due to "Parent directory doesn't exist" > > > > Want to send me a regionserver log Lars? (off-list) > St.Ack > > > > On Thu, May 9, 2013 at 10:03 AM, lars hofhansl <la...@apache.org> wrote: > > Thanks Ted and Varun. > > > > > >Let me check on the .META. server. > > > > > >The majority (13) of the RSs died within 2 minutes. The remaining 3 died > over the following 10 minutes. > >So that would point to general issue. I did not see any ZK issues but > I'll double check. > > > > > >It is just interesting that even now, if I start and RS it aborts within > a minute or two, because of this issue. > > > > > >-- Lars > > > > > >----- Original Message ----- > >From: Ted Yu <yuzhih...@gmail.com> > >To: dev@hbase.apache.org > > > >Cc: > >Sent: Thursday, May 9, 2013 9:51 AM > >Subject: Re: All region server died due to "Parent directory doesn't > exist" > > > >Thanks Varun for sharing your experience. > > > >Lars: > >Was the server carrying .META. functioning properly around the time when > >you observed the problem ? > > > >Cheers > > > >On Thu, May 9, 2013 at 9:41 AM, Varun Sharma <va...@pinterest.com> wrote: > > > >> I meant no NTP/clock synchronization b/w zookeeper quorum and the HBase > >> cluster. I am not sure if you are seeing the exact same issue though. We > >> did not have mass failures at the same time due to this.. > >> > >> Thanks > >> Varun > >> > >> > >> On Thu, May 9, 2013 at 9:39 AM, Varun Sharma <va...@pinterest.com> > wrote: > >> > >> > Btw, I am not 100 % sure but I have some seen something like this > before: > >> > > >> > 1) ZK connection flakiness causes ephemeral nodes to expire > >> > 2) Master detects failure and renames the logs into a splitting > directory > >> > - this is intentional so that in case that region server comes back > up, > >> it > >> > cannot write to the logs being split > >> > 3) Region server dies because the log is renamed > >> > > >> > So, the yanking away of files is done by the HBase master and is > expected > >> > if the master feels the server is dead. We found that the Region > server > >> > logs DFS exceptions like crazy (1000s of them) in that case and we > always > >> > suspected that this is some kind of DFS error but when we really go > upto > >> > the point where it started, we found some zookeeper session issues. > >> > > >> > We had two cases of this - either super high load or NTP/no clock > >> > synchronization b/w the clusters causing this issue for us. > >> > > >> > Thanks > >> > Varun > >> > > >> > > >> > On Thu, May 9, 2013 at 9:16 AM, lars hofhansl <la...@apache.org> > wrote: > >> > > >> >> Thanks Ted. I'll do the same. > >> >> > >> >> > >> >> ----- Original Message ----- > >> >> From: Ted Yu <yuzhih...@gmail.com> > >> >> To: dev@hbase.apache.org; lars hofhansl <la...@apache.org> > >> >> Cc: > >> >> Sent: Thursday, May 9, 2013 9:07 AM > >> >> Subject: Re: All region server died due to "Parent directory doesn't > >> >> exist" > >> >> > >> >> I went through the patch for HBASE-7824 one more time and didn't find > >> >> direct correlation to the issue Lars reported. > >> >> > >> >> I am going over the other JIRAs in Lars' list. > >> >> > >> >> Cheers > >> >> > >> >> On Thu, May 9, 2013 at 8:48 AM, lars hofhansl <la...@apache.org> > wrote: > >> >> > >> >> > I will try. I do not think this is the issue, though. > >> >> > > >> >> > The master is up in my case. > >> >> > Right now the cluster is in a state where each region server aborts > >> >> itself > >> >> > shortly after being started (which coincides with having it's log > >> >> directory > >> >> > renamed to ...-splitting). > >> >> > > >> >> > > >> >> > This is a test cluster and I could just start from scratch... This > >> >> appears > >> >> > to be a serious enough problem, though, and I would like to track > down > >> >> the > >> >> > issue. > >> >> > > >> >> > -- Lars > >> >> > > >> >> > > >> >> > > >> >> > ----- Original Message ----- > >> >> > From: Ted Yu <yuzhih...@gmail.com> > >> >> > To: "dev@hbase.apache.org" <dev@hbase.apache.org> > >> >> > Cc: "dev@hbase.apache.org" <dev@hbase.apache.org> > >> >> > Sent: Thursday, May 9, 2013 2:04 AM > >> >> > Subject: Re: All region server died due to "Parent directory > doesn't > >> >> exist" > >> >> > > >> >> > The config came from hbase-7824. > >> >> > > >> >> > There are other JIRAs in Lars' list which are related to log > >> splitting. > >> >> > > >> >> > I think more investigation is needed. > >> >> > > >> >> > Cheers > >> >> > > >> >> > On May 9, 2013, at 1:59 AM, Andrew Purtell <apurt...@apache.org> > >> wrote: > >> >> > > >> >> > > So that is HBASE-7824, right? > >> >> > > > >> >> > > On Thu, May 9, 2013 at 4:33 PM, Ted Yu <yuzhih...@gmail.com> > wrote: > >> >> > > > >> >> > >> hbase.master.wait.for.log.splitting > >> >> > > > >> >> > > > >> >> > > > >> >> > > > >> >> > > -- > >> >> > > Best regards, > >> >> > > > >> >> > > - Andy > >> >> > > > >> >> > > Problems worthy of attack prove their worth by hitting back. - > Piet > >> >> Hein > >> >> > > (via Tom White) > >> >> > > >> >> > > >> >> > >> >> > >> > > >> > > > > >
