But from the 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$HConnectionImplementation: Checking master
connection
What the Hmaster doing between 12:16:40 and 12:17:11? It's about 30s.
2015-05-18 22:23 GMT+08:00 Ted Yu <yuzhih...@gmail.com>:
> The exception originated from Web UI corresponding
> to HBaseAdmin.listTables().
> At that moment, master was unable to process the request - it needed some
> more time.
>
> Cheers
>
> On Sun, May 17, 2015 at 11:03 PM, Louis Hust <louis.h...@gmail.com> wrote:
>
> > Yes, ted, can you tell me what the following excpetion means in
> > l-namenode1.log?
> >
> > 2015-05-15 12:16:40,522 INFO
> > [MASTER_SERVER_OPERATIONS-l-namenode1:60000-0]
> > handler.ServerShutdownHandler: Finished processing of shutdown of
> > l-hbase31.data.cn8.qunar.com,60020,1427789773001
> > 2015-05-15 12:17:11,301 WARN [686544788@qtp-660252776-212]
> > client.HConnectionManager$HConnectionImplementation: Checking master
> > connection
> >
> > Does this mean the cluster was not operational?
> >
> >
> > 2015-05-18 11:45 GMT+08:00 Ted Yu <yuzhih...@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=OFFLINE, ts=1431663400432, server=null} to
> > > {6f806bb62b347c992cd243fc909276ff state=OPEN, ts=1431663400432, server=
> > > 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 = 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 <yuzhih...@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)
> but
> > > > 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.h...@gmail.com>
> > > wrote:
> > > >
> > > >> Hi, ted,
> > > >>
> > > >> Thanks for your reply!!
> > > >>
> > > >> I found the log in l-namenode2.dba.cn8 during the restarting
> progress:
> > > >> 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:1667)
> > > >> at
> > > >>
> > > >>
> > >
> >
> org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.callBlockingMethod(RpcClient.java:1708)
> > > >> at
> > > >>
> > > >>
> > >
> >
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$BlockingStub.isMasterRunning(MasterProtos.java:40216)
> > > >> at
> > > >>
> > > >>
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$MasterServiceState.isMasterRunning(HConnectionManager.java:1484)
> > > >> at
> > > >>
> > > >>
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.isKeepAliveMasterConnectedAndRunning(HConnectionManager.java:2110)
> > > >> at
> > > >>
> > > >>
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.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 <yuzhih...@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,
> master
> > > 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.h...@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。
> > > >> > > So you means that at 2015-05-15 12:15:04, the HMaster is
> handling
> > > 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
> handling
> > > >> > 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 <yuzhih...@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=OFFLINE, ts=1431663189621, server=null} to
> > > >> > > > {c634280ce287b2d6cebd88b61accf685 state=PENDING_OPEN,
> > > >> ts=1431663189683,
> > > >> > > > server=l-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=OFFLINE, ts=1431663189621, server=null} to
> > > >> > > > {2f60b1b4e51d32ef98ad19690f13a565 state=PENDING_OPEN,
> > > >> ts=1431663189683,
> > > >> > > > server=l-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.h...@gmail.com
> > > >
> > > >> > > wrote:
> > > >> > > >
> > > >> > > > > hi, TED,
> > > >> > > > > Any idea?
> > > >> > > > > When the HMaster restart, how can i know when it is really
> can
> > > >> handle
> > > >> > > > > request from application? is there any mark in logs?
> > > >> > > > >
> > > >> > > > > 2015-05-16 14:05 GMT+08:00 Louis Hust <louis.h...@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
> client?
> > > Is
> > > >> the
> > > >> > > > > HMaster
> > > >> > > > > > recovering or do something else?
> > > >> > > > > >
> > > >> > > > > > 2015-05-16 13:59 GMT+08:00 Louis Hust <
> louis.h...@gmail.com
> > >:
> > > >> > > > > >
> > > >> > > > > >> OK, you can get the log from
> > > >> > > > > >> http://pan.baidu.com/s/1pqS6E
> > > >> > > > > >>
> > > >> > > > > >>
> > > >> > > > > >> 2015-05-16 13:26 GMT+08:00 Ted Yu <yuzhih...@gmail.com>:
> > > >> > > > > >>
> > > >> > > > > >>> Can you check server log on 192.168.39.22
> > > >> > > > > >>> <
> http://l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000
> > >
> > > ?
> > > >> > > > > >>>
> > > >> > > > > >>> That should give you some clue.
> > > >> > > > > >>>
> > > >> > > > > >>> Cheers
> > > >> > > > > >>>
> > > >> > > > > >>> On Fri, May 15, 2015 at 8:22 PM, Louis Hust <
> > > >> > louis.h...@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=OPENING,
> > > >> > > > > >>> > ts=1431663212637, server=l-hbase26.data.cn8.qunar.com
> > > >> > > > > >>> ,60020,1431462615651}
> > > >> > > > > >>> > to {9036a3befee90eeffb9082f90a4a9afa state=OPEN,
> > > >> > > ts=1431663213136,
> > > >> > > > > >>> server=
> > > >> > > > > >>> > 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=/
> > > >> > > > 192.168.39.22:47700
> > > >> > > > > >>> > remote=
> > > >> > > > > >>> > l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000]
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1667)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.callBlockingMethod(RpcClient.java:1708)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$BlockingStub.isMasterRunning(MasterProtos.java:40216)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$MasterServiceState.isMasterRunning(HConnectionManager.java:1484)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.isKeepAliveMasterConnectedAndRunning(HConnectionManager.java:2110)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getKeepAliveMasterService(HConnectionManager.java:1836)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.listTables(HConnectionManager.java:2531)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > >
> > > >>
> > >
> org.apache.hadoop.hbase.client.HBaseAdmin.listTables(HBaseAdmin.java:298)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.__jamon_innerUnit__userTables(MasterStatusTmplImpl.java:530)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.renderNoFlush(MasterStatusTmplImpl.java:255)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.renderNoFlush(MasterStatusTmpl.java:382)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.render(MasterStatusTmpl.java:372)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.hbase.master.MasterStatusServlet.doGet(MasterStatusServlet.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:511)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:109)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:1081)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
> > > >> > > > > >>> > at
> > > >> > > > >
> > > >> org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
> > > >> > > > > >>> > at
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > >
> > > >>
> > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> > > >> > > > > >>> > 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(ContextHandlerCollection.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$RequestHandler.headerComplete(HttpConnection.java:928)
> > > >> > > > > >>> > at
> > > >> org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
> > > >> > > > > >>> > at
> > > >> > > org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> > > >> > > > > >>> > at
> > > >> > > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.mortbay.thread.QueuedThreadPool$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=/
> > > >> > > > 192.168.39.22:47700
> > > >> > > > > >>> > remote=
> > > >> > > > > >>> > 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:1650)
> > > >> > > > > >>> > ... 37 more
> > > >> > > > > >>> > Caused by: java.net.SocketTimeoutException: 60000
> millis
> > > >> > timeout
> > > >> > > > > while
> > > >> > > > > >>> > waiting for channel to be ready for read. ch :
> > > >> > > > > >>> > java.nio.channels.SocketChannel[connected local=/
> > > >> > > > 192.168.39.22:47700
> > > >> > > > > >>> > remote=
> > > >> > > > > >>> > l-namenode2.dba.cn8.qunar.com/192.168.39.22:60000]
> > > >> > > > > >>> > at
> > > >> > > > > >>> >
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > >
> >
> org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164)
> > > >> > > > > >>> > 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(RpcClient.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$Connection.readResponse(RpcClient.java:1057)
> > > >> > > > > >>> > at
> > > >> > > > > >>>
> > > >> > > > >
> > > >> > >
> > > >>
> > org.apache.hadoop.hbase.ipc.RpcClient$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?
> > > >> > > > > >>> >
> > > >> > > > > >>>
> > > >> > > > > >>
> > > >> > > > > >>
> > > >> > > > > >
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> >
> > > >>
> > > >
> > > >
> > >
> >
>
