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Date: Mon, 18 May 2015 07:23:24 -0700
Message-ID: 
 <CALte62xY5sPPm=ZZ9qitF6RDUP8gNCjAX9J-RJt8QjRFGQdR9A@mail.gmail.com>
Subject: Re: HMaster restart with error
From: Ted Yu <yuzhihong@gmail.com>
To: "user@hbase.apache.org" <user@hbase.apache.org>
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The exception originated from Web UI corresponding
to HBaseAdmin.listTables().
At that moment, master was unable to process the request - it needed some
more time.

Cheers

On Sun, May 17, 2015 at 11:03 PM, Louis Hust <louis.hust@gmail.com> wrote:

> Yes, ted, can you tell me what the following excpetion means in
> l-namenode1.log?
>
> 2015-05-15 12:16:40,522 INFO
>  [MASTER_SERVER_OPERATIONS-l-namenode1:60000-0]
> handler.ServerShutdownHandler: Finished processing of shutdown of
> l-hbase31.data.cn8.qunar.com,60020,1427789773001
> 2015-05-15 12:17:11,301 WARN  [686544788@qtp-660252776-212]
> client.HConnectionManager$HConnectionImplementation: Checking master
> connection
>
> Does this mean the cluster was not operational?
>
>
> 2015-05-18 11:45 GMT+08:00 Ted Yu <yuzhihong@gmail.com>:
>
> > After l-namenode1 became active master , it assigned regions:
> >
> > 2015-05-15 12:16:40,432 INFO  [master:l-namenode1:60000]
> > master.RegionStates: Transitioned {6f806bb62b347c992cd243fc909276ff
> > state=3DOFFLINE, ts=3D1431663400432, server=3Dnull} to
> > {6f806bb62b347c992cd243fc909276ff state=3DOPEN, ts=3D1431663400432, ser=
ver=3D
> > l-hbase31.data.cn8.qunar.com,60020,1431462584879}
> >
> > However, l-hbase31 went down:
> >
> > 2015-05-15 12:16:40,508 INFO
> >  [MASTER_SERVER_OPERATIONS-l-namenode1:60000-0]
> > handler.ServerShutdownHandler: Splitting logs for
> > l-hbase31.data.cn8.qunar.com,60020,1427789773001   before assignment.
> >
> > l-namenode1 was restarted :
> >
> > 2015-05-15 12:20:25,322 INFO  [main] util.VersionInfo: HBase
> 0.96.0-hadoop2
> > 2015-05-15 12:20:25,323 INFO  [main] util.VersionInfo: Subversion
> > https://svn.apache.org/repos/asf/hbase/branches/0.96 -r 1531434
> >
> > However, it went down due to zookeeper session expiration:
> >
> > 2015-05-15 12:20:25,580 WARN  [main] zookeeper.ZooKeeperNodeTracker:
> Can't
> > get or delete the master znode
> > org.apache.zookeeper.KeeperException$SessionExpiredException:
> > KeeperErrorCode =3D Session expired for /hbase/master
> >
> > It started again after that and AssignmentManager did a lot of
> assignments.
> >
> > Looks like the cluster was operational this time.
> >
> > Cheers
> >
> > On Sun, May 17, 2015 at 8:24 AM, Ted Yu <yuzhihong@gmail.com> wrote:
> >
> > > bq. the backup master take over at 2015-05-15 12:16:40,024 ?
> > >
> > > The switch of active master should be earlier than 12:16:40,024 -
> shortly
> > > after 12:15:58
> > >
> > > l-namenode1 would do some initialization (such as waiting for region
> > > servers count to settle) after it became active master.
> > >
> > > I tried to download from http://pan.baidu.com/s/1eQlKXj0 (at home) bu=
t
> > > the download progress was very slow.
> > >
> > > Will try downloading later in the day.
> > >
> > > Do you have access to pastebin ?
> > >
> > > Cheers
> > >
> > > On Sun, May 17, 2015 at 2:07 AM, Louis Hust <louis.hust@gmail.com>
> > wrote:
> > >
> > >> Hi, ted,
> > >>
> > >> Thanks for your reply!!
> > >>
> > >> I found the log in l-namenode2.dba.cn8 during the restarting progres=
s:
> > >> 2015-05-15 12:11:36,540 INFO  [master:l-namenode2:60000]
> > >> master.ServerManager: Finished waiting for region servers count to
> > settle;
> > >> checked in 5, slept for 4511 ms, expecting minimum of 1, maximum of
> > >> 2147483647, master is running.
> > >>
> > >> So this means the HMaster ready for handle request at 12:11:36?
> > >>
> > >> The backup master is l-namenode1.dba.cn8 and you can get the log at =
:
> > >>
> > >> http://pan.baidu.com/s/1eQlKXj0
> > >>
> > >> After the l-namenode2.dba.cn8 is stopped by me at 12:15:58,
> > >> the backup master l-namenode1 take over, and i found log:
> > >>
> > >> 2015-05-15 12:16:40,024 INFO  [master:l-namenode1:60000]
> > >> master.ServerManager: Finished waiting for region servers count to
> > settle;
> > >> checked in 4, slept for 5663 ms, expecting minimum of 1, maximum of
> > >> 2147483647, master is running.
> > >>
> > >> So the backup master take over at 2015-05-15 12:16:40,024 ?
> > >>
> > >> But it seems the l-namenode2 not working normally with the exception
> in
> > >> log:
> > >>
> > >> 2015-05-15 12:16:40,522 INFO
> > >>  [MASTER_SERVER_OPERATIONS-l-namenode1:60000-0]
> > >> handler.ServerShutdownHandler: Finished processing of shutdown of
> > >> l-hbase31.data.cn8.qunar.com,60020,1427789773001
> > >> 2015-05-15 12:17:11,301 WARN  [686544788@qtp-660252776-212]
> > >> client.HConnectionManager$HConnectionImplementation: Checking master
> > >> connection
> > >> com.google.protobuf.ServiceException: java.net.ConnectException:
> > >> Connection
> > >> refused
> > >> at
> > >>
> > >>
> >
> org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1=
667)
> > >> at
> > >>
> > >>
> >
> org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.ca=
llBlockingMethod(RpcClient.java:1708)
> > >> at
> > >>
> > >>
> >
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$Blo=
ckingStub.isMasterRunning(MasterProtos.java:40216)
> > >> at
> > >>
> > >>
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementati=
on$MasterServiceState.isMasterRunning(HConnectionManager.java:1484)
> > >> at
> > >>
> > >>
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementati=
on.isKeepAliveMasterConnectedAndRunning(HConnectionManager.java:2110)
> > >> at
> > >>
> > >>
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementati=
on.getKeepAliveMasterService(HConnectionManager.java:1836)
> > >>
> > >> Is the exception means the HMaster not working normally or somewhat?
> > >>
> > >>
> > >>
> > >> 2015-05-17 11:06 GMT+08:00 Ted Yu <yuzhihong@gmail.com>:
> > >>
> > >> > bq. the HMaster is handling two region server down, and not ready =
to
> > >> handle
> > >> > client request?
> > >> >
> > >> > I didn't mean that - for a functioning master, handling region
> server
> > >> > shutdown is part of the master's job.
> > >> >
> > >> > You should see something similar to the following in (functioning)
> > >> master
> > >> > log:
> > >> >
> > >> > 2015-05-13 04:06:36,266 INFO  [master:c6401:60000]
> > master.ServerManager:
> > >> > Finished waiting for region servers count to settle; checked in 1,
> > slept
> > >> > for 71582 ms, expecting minimum of 1, maximum of 2147483647, maste=
r
> > is
> > >> > running.
> > >> >
> > >> > bq. wait the backend HMaster to take over
> > >> >
> > >> > Was there exception in backup master log after it took over ?
> > >> >
> > >> > On Sat, May 16, 2015 at 6:44 PM, Louis Hust <louis.hust@gmail.com>
> > >> wrote:
> > >> >
> > >> > > hi,ted,
> > >> > >
> > >> > > Thanks very much!
> > >> > >
> > >> > > Namenode process was not running on
> > >> l-namenode2.dba.cn8(192.168.39.22),
> > >> > > just HMaster run on it=E3=80=82
> > >> > > So you means that at 2015-05-15 12:15:04,  the HMaster is handli=
ng
> > two
> > >> > > region server down, and not
> > >> > > ready to handle client request? And how can i tell when the
> HMaster
> > is
> > >> > > ready to handle client request
> > >> > > from the logs?
> > >> > >
> > >> > > I stop the Hmaster at 12:15:58 cause the HMaster can not handlin=
g
> > >> > request,
> > >> > > so i want to stop it and wait
> > >> > > the backend HMaster to take over.
> > >> > >
> > >> > >
> > >> > >
> > >> > >
> > >> > > 2015-05-17 0:29 GMT+08:00 Ted Yu <yuzhihong@gmail.com>:
> > >> > >
> > >> > > > In the period you identified, master was assigning regions.
> > >> > > > e.g.
> > >> > > >
> > >> > > > 2015-05-15 12:13:09,683 INFO
> > >> > > > [l-namenode2.dba.cn8.qunar.com
> > >> > > ,60000,1431663090427-GeneralBulkAssigner-0]
> > >> > > > master.RegionStates: Transitioned
> > {c634280ce287b2d6cebd88b61accf685
> > >> > > > state=3DOFFLINE, ts=3D1431663189621, server=3Dnull} to
> > >> > > > {c634280ce287b2d6cebd88b61accf685 state=3DPENDING_OPEN,
> > >> ts=3D1431663189683,
> > >> > > > server=3Dl-hbase26.data.cn8.qunar.com,60020,1431462615651}
> > >> > > > 2015-05-15 12:13:09,683 INFO
> > >> > > > [l-namenode2.dba.cn8.qunar.com
> > >> > > ,60000,1431663090427-GeneralBulkAssigner-2]
> > >> > > > master.RegionStates: Transitioned
> > {2f60b1b4e51d32ef98ad19690f13a565
> > >> > > > state=3DOFFLINE, ts=3D1431663189621, server=3Dnull} to
> > >> > > > {2f60b1b4e51d32ef98ad19690f13a565 state=3DPENDING_OPEN,
> > >> ts=3D1431663189683,
> > >> > > > server=3Dl-hbase30.data.cn8.qunar.com,60020,1431462562233}
> > >> > > >
> > >> > > > Then two region servers went down:
> > >> > > >
> > >> > > > 2015-05-15 12:14:40,699 INFO  [main-EventThread]
> > >> > > > zookeeper.RegionServerTracker: RegionServer ephemeral node
> > deleted,
> > >> > > > processing expiration [l-hbase27.data.cn8.qunar.com,60020,
> > >> > > >  1431663208899]
> > >> > > > 2015-05-15 12:15:04,899 INFO  [main-EventThread]
> > >> > > > zookeeper.RegionServerTracker: RegionServer ephemeral node
> > deleted,
> > >> > > > processing expiration [l-hbase25.data.cn8.qunar.com,60020,
> > >> > > >  1431663193865]
> > >> > > >
> > >> > > > Master was stopped afterwards:
> > >> > > >
> > >> > > > Fri May 15 12:15:58 CST 2015 Terminating master
> > >> > > >
> > >> > > > Namenode process was running on l-namenode2.dba.cn8, right ?
> > >> > > >
> > >> > > > Cheers
> > >> > > >
> > >> > > > On Sat, May 16, 2015 at 7:50 AM, Louis Hust <
> louis.hust@gmail.com
> > >
> > >> > > wrote:
> > >> > > >
> > >> > > > > hi, TED,
> > >> > > > > Any idea?
> > >> > > > > When the HMaster restart, how can i know when it is really c=
an
> > >> handle
> > >> > > > > request from application? is there any mark in logs?
> > >> > > > >
> > >> > > > > 2015-05-16 14:05 GMT+08:00 Louis Hust <louis.hust@gmail.com>=
:
> > >> > > > >
> > >> > > > > > @Ted,
> > >> > > > > > plz see the log from 12:11:29 to 12:15:28, this timerange
> the
> > >> > HMaster
> > >> > > > is
> > >> > > > > > in restarting stage, but can not handle request from clien=
t?
> > Is
> > >> the
> > >> > > > > HMaster
> > >> > > > > > recovering or do something else?
> > >> > > > > >
> > >> > > > > > 2015-05-16 13:59 GMT+08:00 Louis Hust <louis.hust@gmail.co=
m
> >:
> > >> > > > > >
> > >> > > > > >> OK, you can get the log from
> > >> > > > > >> http://pan.baidu.com/s/1pqS6E
> > >> > > > > >>
> > >> > > > > >>
> > >> > > > > >> 2015-05-16 13:26 GMT+08:00 Ted Yu <yuzhihong@gmail.com>:
> > >> > > > > >>
> > >> > > > > >>> Can you check server log on 192.168.39.22
> > >> > > > > >>> <http://l-namenode2.dba.cn8.qunar.com/192.168.39.22:6000=
0
> >
> > ?
> > >> > > > > >>>
> > >> > > > > >>> That should give you some clue.
> > >> > > > > >>>
> > >> > > > > >>> Cheers
> > >> > > > > >>>
> > >> > > > > >>> On Fri, May 15, 2015 at 8:22 PM, Louis Hust <
> > >> > louis.hust@gmail.com>
> > >> > > > > >>> wrote:
> > >> > > > > >>>
> > >> > > > > >>> > Hi all,
> > >> > > > > >>> >
> > >> > > > > >>> > I use hbase0.96.0 with hadoop 2.2.0,
> > >> > > > > >>> > and the custom said they can not write into hbase
> cluster,
> > >> > > > > >>> > So i stop the HMaster and start it soon,
> > >> > > > > >>> >
> > >> > > > > >>> > But it seems that the HMaster not response to request,
> > >> > following
> > >> > > is
> > >> > > > > the
> > >> > > > > >>> > HMaster log:
> > >> > > > > >>> >
> > >> > > > > >>> > {logs}
> > >> > > > > >>> > 2015-05-15 12:13:33,136 INFO  [AM.ZK.Worker-pool2-t16]
> > >> > > > > >>> master.RegionStates:
> > >> > > > > >>> > Transitioned {9036a3befee90eeffb9082f90a4a9afa
> > >> state=3DOPENING,
> > >> > > > > >>> > ts=3D1431663212637, server=3Dl-hbase26.data.cn8.qunar.=
com
> > >> > > > > >>> ,60020,1431462615651}
> > >> > > > > >>> > to {9036a3befee90eeffb9082f90a4a9afa state=3DOPEN,
> > >> > > ts=3D1431663213136,
> > >> > > > > >>> server=3D
> > >> > > > > >>> > l-hbase26.data.cn8.qunar.com,60020,1431462615651}
> > >> > > > > >>> > 2015-05-15 12:13:33,139 INFO  [AM.ZK.Worker-pool2-t4]
> > >> > > > > >>> master.RegionStates:
> > >> > > > > >>> > Onlined 9036a3befee90eeffb9082f90a4a9afa on
> > >> > > > > >>> l-hbase26.data.cn8.qunar.com
> > >> > > > > >>> > ,60020,1431462615651
> > >> > > > > >>> > 2015-05-15 12:14:40,699 INFO  [main-EventThread]
> > >> > > > > >>> > zookeeper.RegionServerTracker: RegionServer ephemeral
> node
> > >> > > deleted,
> > >> > > > > >>> > processing expiration [l-hbase27.data.cn8.qunar.com
> > >> > > > > >>> ,60020,1431663208899]
> > >> > > > > >>> > 2015-05-15 12:15:04,899 INFO  [main-EventThread]
> > >> > > > > >>> > zookeeper.RegionServerTracker: RegionServer ephemeral
> node
> > >> > > deleted,
> > >> > > > > >>> > processing expiration [l-hbase25.data.cn8.qunar.com
> > >> > > > > >>> ,60020,1431663193865]
> > >> > > > > >>> > 2015-05-15 12:15:24,465 WARN
> [249240421@qtp-591022857-33
> > ]
> > >> > > > > >>> > client.HConnectionManager$HConnectionImplementation:
> > >> Checking
> > >> > > > master
> > >> > > > > >>> > connection
> > >> > > > > >>> > com.google.protobuf.ServiceException:
> > >> > > > > java.net.SocketTimeoutException:
> > >> > > > > >>> Call
> > >> > > > > >>> > to l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000
> > failed
> > >> > > > because
> > >> > > > > >>> > java.net.SocketTimeoutException: 60000 millis timeout
> > while
> > >> > > waiting
> > >> > > > > for
> > >> > > > > >>> > channel to be ready for read. ch :
> > >> > > > > >>> > java.nio.channels.SocketChannel[connected local=3D/
> > >> > > > 192.168.39.22:47700
> > >> > > > > >>> > remote=3D
> > >> > > > > >>> > l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000]
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1=
667)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.ca=
llBlockingMethod(RpcClient.java:1708)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$Blo=
ckingStub.isMasterRunning(MasterProtos.java:40216)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementati=
on$MasterServiceState.isMasterRunning(HConnectionManager.java:1484)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementati=
on.isKeepAliveMasterConnectedAndRunning(HConnectionManager.java:2110)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementati=
on.getKeepAliveMasterService(HConnectionManager.java:1836)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementati=
on.listTables(HConnectionManager.java:2531)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> > org.apache.hadoop.hbase.client.HBaseAdmin.listTables(HBaseAdmin.java:29=
8)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.__jamon_innerUni=
t__userTables(MasterStatusTmplImpl.java:530)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.renderNoFlush(Ma=
sterStatusTmplImpl.java:255)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.renderNoFlush(Master=
StatusTmpl.java:382)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.render(MasterStatusT=
mpl.java:372)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.master.MasterStatusServlet.doGet(MasterStatusServ=
let.java:95)
> > >> > > > > >>> > at
> > >> javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
> > >> > > > > >>> > at
> > >> javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > >
> > >> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:51=
1)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHand=
ler.java:1221)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(=
StaticUserWebFilter.java:109)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHand=
ler.java:1212)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.=
java:1081)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHand=
ler.java:1212)
> > >> > > > > >>> > at
> > >> > > > >
> > >> org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHand=
ler.java:1212)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:21=
6)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > >
> > org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerC=
ollection.java:230)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> > >> > > > > >>> > at org.mortbay.jetty.Server.handle(Server.java:326)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > >
> > >>
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnec=
tion.java:928)
> > >> > > > > >>> > at
> > >> org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
> > >> > > > > >>> > at
> > >> > > org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> > >> > > > > >>> > at
> > >> > > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:4=
10)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:=
582)
> > >> > > > > >>> > Caused by: java.net.SocketTimeoutException: Call to
> > >> > > > > >>> > l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000
> failed
> > >> > because
> > >> > > > > >>> > java.net.SocketTimeoutException: 60000 millis timeout
> > while
> > >> > > waiting
> > >> > > > > for
> > >> > > > > >>> > channel to be ready for read. ch :
> > >> > > > > >>> > java.nio.channels.SocketChannel[connected local=3D/
> > >> > > > 192.168.39.22:47700
> > >> > > > > >>> > remote=3D
> > >> > > > > >>> > l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000]
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.apache.hadoop.hbase.ipc.RpcClient.wrapException(RpcClient.java:1475)
> > >> > > > > >>> > at
> > >> > > org.apache.hadoop.hbase.ipc.RpcClient.call(RpcClient.java:1450)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1=
650)
> > >> > > > > >>> > ... 37 more
> > >> > > > > >>> > Caused by: java.net.SocketTimeoutException: 60000 mill=
is
> > >> > timeout
> > >> > > > > while
> > >> > > > > >>> > waiting for channel to be ready for read. ch :
> > >> > > > > >>> > java.nio.channels.SocketChannel[connected local=3D/
> > >> > > > 192.168.39.22:47700
> > >> > > > > >>> > remote=3D
> > >> > > > > >>> > l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000]
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:1=
64)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131)
> > >> > > > > >>> > at
> > >> java.io.FilterInputStream.read(FilterInputStream.java:133)
> > >> > > > > >>> > at
> > >> java.io.FilterInputStream.read(FilterInputStream.java:133)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.ipc.RpcClient$Connection$PingInputStream.read(Rpc=
Client.java:553)
> > >> > > > > >>> > at
> > >> > java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
> > >> > > > > >>> > at
> > >> > java.io.BufferedInputStream.read(BufferedInputStream.java:254)
> > >> > > > > >>> > at
> > java.io.DataInputStream.readInt(DataInputStream.java:387)
> > >> > > > > >>> > at
> > >> > > > > >>> >
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.ipc.RpcClient$Connection.readResponse(RpcClient.j=
ava:1057)
> > >> > > > > >>> > at
> > >> > > > > >>>
> > >> > > > >
> > >> > >
> > >>
> org.apache.hadoop.hbase.ipc.RpcClient$Connection.run(RpcClient.java:719)
> > >> > > > > >>> > Fri May 15 12:15:58 CST 2015 Terminating master
> > >> > > > > >>> > {/logs}
> > >> > > > > >>> > So what the exception means? Why? and how to solve the
> > >> problem?
> > >> > > > > >>> >
> > >> > > > > >>>
> > >> > > > > >>
> > >> > > > > >>
> > >> > > > > >
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> > >
> > >
> >
>

--047d7b676d52cc7e8e05165bef77--