HBase Master: Failed to become active master

[#1]

HBase Master cannot start up!!

Here is the error (trace):

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2015-05-08 09:31:02,675 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.library.path=/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/hadoop/lib/native
2015-05-08 09:31:02,675 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.io.tmpdir=/tmp
2015-05-08 09:31:02,675 INFO org.apache.zookeeper.ZooKeeper: Client environment:java.compiler=<NA>
2015-05-08 09:31:02,675 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.name=Linux
2015-05-08 09:31:02,675 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.arch=amd64
2015-05-08 09:31:02,675 INFO org.apache.zookeeper.ZooKeeper: Client environment:os.version=2.6.32-431.el6.x86_64
2015-05-08 09:31:02,676 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.name=hbase
2015-05-08 09:31:02,676 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.home=/var/lib/hbase
2015-05-08 09:31:02,676 INFO org.apache.zookeeper.ZooKeeper: Client environment:user.dir=/var/run/cloudera-scm-agent/process/1831-hbase-MASTER
2015-05-08 09:31:02,676 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=node1:2181,master:2181,node2:2181 sessionTimeout=60000 watcher=master:600000x0, quorum=node1:2181,master:2181,node2:2181, baseZNode=/hbase
2015-05-08 09:31:02,687 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server node1/10.15.230.41:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-08 09:31:02,690 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to node1/10.15.230.41:2181, initiating session
2015-05-08 09:31:02,695 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete on server node1/10.15.230.41:2181, sessionid = 0x24d3137ed890570, negotiated timeout = 60000
2015-05-08 09:31:02,729 INFO org.apache.hadoop.hbase.ipc.RpcServer: RpcServer.responder: starting
2015-05-08 09:31:02,729 INFO org.apache.hadoop.hbase.ipc.RpcServer: RpcServer.listener,port=60000: starting
2015-05-08 09:31:02,776 INFO org.mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
2015-05-08 09:31:02,780 INFO org.apache.hadoop.hbase.http.HttpRequestLog: Http request log for http.requests.master is not defined
2015-05-08 09:31:02,788 INFO org.apache.hadoop.hbase.http.HttpServer: Added global filter 'safety' (class=org.apache.hadoop.hbase.http.HttpServer$QuotingInputFilter)
2015-05-08 09:31:02,790 INFO org.apache.hadoop.hbase.http.HttpServer: Added filter static_user_filter (class=org.apache.hadoop.hbase.http.lib.StaticUserWebFilter$StaticUserFilter) to context master
2015-05-08 09:31:02,790 INFO org.apache.hadoop.hbase.http.HttpServer: Added filter static_user_filter (class=org.apache.hadoop.hbase.http.lib.StaticUserWebFilter$StaticUserFilter) to context static
2015-05-08 09:31:02,791 INFO org.apache.hadoop.hbase.http.HttpServer: Added filter static_user_filter (class=org.apache.hadoop.hbase.http.lib.StaticUserWebFilter$StaticUserFilter) to context logs
2015-05-08 09:31:02,803 INFO org.apache.hadoop.hbase.http.HttpServer: Jetty bound to port 60010
2015-05-08 09:31:02,803 INFO org.mortbay.log: jetty-6.1.26.cloudera.4
2015-05-08 09:31:03,061 INFO org.mortbay.log: Started SelectChannelConnector@0.0.0.0:60010
2015-05-08 09:31:03,063 INFO org.apache.hadoop.hbase.master.HMaster: hbase.rootdir=hdfs://master:8020/hbase, hbase.cluster.distributed=true
2015-05-08 09:31:03,073 INFO org.apache.hadoop.hbase.master.HMaster: Adding backup master ZNode /hbase/backup-masters/master,60000,1431091861873
2015-05-08 09:31:03,142 INFO org.apache.hadoop.hbase.master.ActiveMasterManager: Deleting ZNode for /hbase/backup-masters/master,60000,1431091861873 from backup master directory
2015-05-08 09:31:03,149 INFO org.apache.hadoop.hbase.master.ActiveMasterManager: Registered Active Master=master,60000,1431091861873
2015-05-08 09:31:03,152 INFO org.apache.hadoop.conf.Configuration.deprecation: fs.default.name is deprecated. Instead, use fs.defaultFS
2015-05-08 09:31:03,161 INFO org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: Process identifier=hconnection-0x348d62d4 connecting to ZooKeeper ensemble=node1:2181,master:2181,node2:2181
2015-05-08 09:31:03,162 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=node1:2181,master:2181,node2:2181 sessionTimeout=60000 watcher=hconnection-0x348d62d40x0, quorum=node1.net:2181,master:2181,node2:2181, baseZNode=/hbase
2015-05-08 09:31:03,162 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server node2/10.15.230.42:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-08 09:31:03,163 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to node2/10.15.230.42:2181, initiating session
2015-05-08 09:31:03,164 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete on server node2/10.15.230.42:2181, sessionid = 0x34d3137ea45057a, negotiated timeout = 60000
2015-05-08 09:31:03,184 INFO org.apache.hadoop.hbase.regionserver.HRegionServer: ClusterId : d72a7eb0-8dba-485b-a8bc-2fbf5a182ed7
2015-05-08 09:31:03,365 INFO org.apache.hadoop.hbase.fs.HFileSystem: Added intercepting call to namenode#getBlockLocations so can do block reordering using class class org.apache.hadoop.hbase.fs.HFileSystem$ReorderWALBlocks
2015-05-08 09:31:03,370 INFO org.apache.hadoop.hbase.coordination.SplitLogManagerCoordination: Found 0 orphan tasks and 0 rescan nodes
2015-05-08 09:31:03,383 INFO org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: Process identifier=hconnection-0x7ae2a774 connecting to ZooKeeper ensemble=node1:2181,master:2181,node2:2181
2015-05-08 09:31:03,383 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=node1:2181,master:2181,node2:2181 sessionTimeout=60000 watcher=hconnection-0x7ae2a7740x0, quorum=node1:2181,master:2181,node2:2181, baseZNode=/hbase
2015-05-08 09:31:03,385 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server node1/10.15.230.41:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-08 09:31:03,385 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to node1/10.15.230.41:2181, initiating session
2015-05-08 09:31:03,386 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete on server node1/10.15.230.41:2181, sessionid = 0x24d3137ed890571, negotiated timeout = 60000
2015-05-08 09:31:03,398 INFO org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer: loading config
2015-05-08 09:31:03,439 INFO org.apache.hadoop.hbase.master.HMaster: Server active/primary master=master,60000,1431091861873, sessionid=0x24d3137ed890570, setting cluster-up flag (Was=true)
2015-05-08 09:31:03,452 INFO org.apache.hadoop.hbase.procedure.ZKProcedureUtil: Clearing all procedure znodes: /hbase/online-snapshot/acquired /hbase/online-snapshot/reached /hbase/online-snapshot/abort
2015-05-08 09:31:03,458 INFO org.apache.hadoop.hbase.procedure.ZKProcedureUtil: Clearing all procedure znodes: /hbase/flush-table-proc/acquired /hbase/flush-table-proc/reached /hbase/flush-table-proc/abort
2015-05-08 09:31:03,485 INFO org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: Process identifier=replicationLogCleaner connecting to ZooKeeper ensemble=node1:2181,master:2181,node2:2181
2015-05-08 09:31:03,485 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=node1:2181,master:2181,node2:2181 sessionTimeout=60000 watcher=replicationLogCleaner0x0, quorum=node1:2181,master:2181,node2:2181, baseZNode=/hbase
2015-05-08 09:31:03,486 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server node1/10.15.230.41:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-08 09:31:03,486 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to node1/10.15.230.41:2181, initiating session
2015-05-08 09:31:03,487 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete on server node1/10.15.230.41:2181, sessionid = 0x24d3137ed890572, negotiated timeout = 60000
2015-05-08 09:31:03,495 INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for 0 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms.
2015-05-08 09:31:04,998 INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for 1503 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms.
2015-05-08 09:31:06,300 INFO org.apache.hadoop.hbase.master.ServerManager: Registering server=node2,60020,1431091828858
2015-05-08 09:31:06,300 INFO org.apache.hadoop.hbase.master.ServerManager: Registering server=node3,60020,1431091829281
2015-05-08 09:31:06,300 INFO org.apache.hadoop.hbase.master.ServerManager: Registering server=node5,60020,1431091828696
2015-05-08 09:31:06,301 INFO org.apache.hadoop.hbase.master.ServerManager: Registering server=node4,60020,1431091828684
2015-05-08 09:31:06,301 INFO org.apache.hadoop.hbase.master.ServerManager: Registering server=node1,60020,1431091828790
2015-05-08 09:31:06,301 INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 4, slept for 2806 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms.
2015-05-08 09:31:06,352 INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 5, slept for 2857 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms.
2015-05-08 09:31:07,855 INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 5, slept for 4360 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms.
2015-05-08 09:31:08,006 INFO org.apache.hadoop.hbase.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
2015-05-08 09:31:08,012 INFO org.apache.hadoop.hbase.master.MasterFileSystem: Log folder hdfs://master:8020/hbase/WALs/node1,60020,1431091828790 belongs to an existing region server
2015-05-08 09:31:08,013 INFO org.apache.hadoop.hbase.master.MasterFileSystem: Log folder hdfs://master:8020/hbase/WALs/node2,60020,1431091828858 belongs to an existing region server
2015-05-08 09:31:08,015 INFO org.apache.hadoop.hbase.master.MasterFileSystem: Log folder hdfs://master:8020/hbase/WALs/node3,60020,1431091829281 belongs to an existing region server
2015-05-08 09:31:08,016 INFO org.apache.hadoop.hbase.master.MasterFileSystem: Log folder hdfs://master:8020/hbase/WALs/node4,60020,1431091828684 belongs to an existing region server
2015-05-08 09:31:08,017 INFO org.apache.hadoop.hbase.master.MasterFileSystem: Log folder hdfs://master:8020/hbase/WALs/node5,60020,1431091828696 belongs to an existing region server
2015-05-08 09:31:08,081 INFO org.apache.hadoop.hbase.master.RegionStates: Transition {1588230740 state=OFFLINE, ts=1431091868026, server=null} to {1588230740 state=OPEN, ts=1431091868081, server=node3,60020,1431091829281}
2015-05-08 09:31:08,083 INFO org.apache.hadoop.hbase.master.ServerManager: AssignmentManager hasn't finished failover cleanup; waiting
2015-05-08 09:31:08,084 INFO org.apache.hadoop.hbase.master.HMaster: hbase:meta assigned=0, rit=false, location=node3,60020,1431091829281
2015-05-08 09:31:08,128 INFO org.apache.hadoop.hbase.MetaMigrationConvertingToPB: hbase:meta doesn't have any entries to update.
2015-05-08 09:31:08,128 INFO org.apache.hadoop.hbase.MetaMigrationConvertingToPB: META already up-to date with PB serialization
2015-05-08 09:31:08,145 INFO org.apache.hadoop.hbase.master.AssignmentManager: Clean cluster startup. Assigning user regions
2015-05-08 09:31:08,150 INFO org.apache.hadoop.hbase.master.AssignmentManager: Joined the cluster in 22ms, failover=false
2015-05-08 09:31:08,161 INFO org.apache.hadoop.hbase.master.TableNamespaceManager: Namespace table not found. Creating...
2015-05-08 09:31:08,189 FATAL org.apache.hadoop.hbase.master.HMaster: Failed to become active master
org.apache.hadoop.hbase.TableExistsException: hbase:namespace
        at org.apache.hadoop.hbase.master.handler.CreateTableHandler.checkAndSetEnablingTable(CreateTableHandler.java:152)
        at org.apache.hadoop.hbase.master.handler.CreateTableHandler.prepare(CreateTableHandler.java:125)
        at org.apache.hadoop.hbase.master.TableNamespaceManager.createNamespaceTable(TableNamespaceManager.java:233)
        at org.apache.hadoop.hbase.master.TableNamespaceManager.start(TableNamespaceManager.java:86)
        at org.apache.hadoop.hbase.master.HMaster.initNamespace(HMaster.java:897)
        at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:739)
        at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:169)
        at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1469)
        at java.lang.Thread.run(Thread.java:745)
2015-05-08 09:31:08,195 FATAL org.apache.hadoop.hbase.master.HMaster: Master server abort: loaded coprocessors are: []
2015-05-08 09:31:08,195 FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception. Starting shutdown.

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[#2]

Hi,

Can you please describe how you arrived into this? Have you tried to remove some files from HDFS or some data from ZK?

From the logs, sound like the master is not able to find the namespace table, so tries to create it and failed because it exist.

Can you paste the result of the following command?

hadoop fs -ls -R /hbase/data/hbase/

Thanks,

JMS

[#3]

I 've got many HDFS corrupt blocks and I have re-deployed the HBase service.

I did clean the HBase env before I re-installed it.

Here is the outcome:

[root@master ~]# hadoop fs -ls -R /hbase/data/hbase/
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/.tabledesc
-rw-r--r--   2 hbase hbase        372 2015-05-08 09:30 /hbase/data/hbase/meta/.tabledesc/.tableinfo.0000000001
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/.tmp
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740
-rw-r--r--   2 hbase hbase         32 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/.regioninfo
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/info
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/recovered.edits
-rw-r--r--   2 hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/recovered.edits/3.seqid

[#4]

OK. The namespace table is not there.

So your HBase is empty, right?

Can you provide hadoop fs -ls -R /hbase/data/ then?

Have you also cleared the ZK nodes?

If you want to clear HBase correctly you need to:

1) Clear /hbase/* and make sure /hbase belongs to the HBase user

2) Clear all HBase zk nodes.

Thanks,

JM

[#5]

I have already cleared the /hbase/* HDFS folder.

But I cannot clear the HBase zk nodes!!

When I launch zookeeper client it hangs....

The output is same as before:

 [root@master ~]# hadoop fs -ls -R /hbase/data/
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/.tabledesc
-rw-r--r--   2 hbase hbase        372 2015-05-08 09:30 /hbase/data/hbase/meta/.tabledesc/.tableinfo.0000000001
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/.tmp
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740
-rw-r--r--   2 hbase hbase         32 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/.regioninfo
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/info
drwxr-xr-x   - hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/recovered.edits
-rw-r--r--   2 hbase hbase          0 2015-05-08 09:30 /hbase/data/hbase/meta/1588230740/recovered.edits/3.seqid

[#6]

Any other suggestions to resolve the issue??

[#7]

Hi TS, sorry, had to transit to was not able to reply yesterday.

So there is 2 issues here.

1) You can not access ZK

2) HBase can not create the namespace table.

They might be related. If we can not access ZK, maybe HBase can't too.

So let's focus on the ZK issue first.

Please stop all HBase services and make sure ZK is running. When you try to run the zkClient command, what do you get? What do you have on the ZK logs? Have you tried to restart the ZK service?

JM

[#8]

Hi JM, thank you!

I have restarted ZK, but still I am unable to get the ZK Client working!

[root@master ~]# zookeeper-client
Connecting to localhost:2181
2015-05-09 21:32:09,148 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-cdh5.4.0--1, built on 04/21/2015 19:11 GMT
2015-05-09 21:32:09,150 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=master
2015-05-09 21:32:09,151 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.7.0/jre
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../build/classes:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../build/lib/*.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j-log4j12.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j-log4j12-1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j-api-1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/netty-3.2.2.Final.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/log4j-1.2.16.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/jline-2.11.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../zookeeper-3.4.5-cdh5.4.0.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../src/java/lib/*.jar:/etc/zookeeper/conf::/etc/zookeeper/conf:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/zookeeper-3.4.5-cdh5.4.0.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/zookeeper.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/jline-2.11.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/netty-3.2.2.Final.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/slf4j-api-1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/log4j-1.2.16.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/slf4j-log4j12.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/slf4j-log4j12-1.7.5.jar
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=2.6.32-431.el6.x86_64
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/root
2015-05-09 21:32:09,154 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@2fe85210
Welcome to ZooKeeper!
JLine support is disabled
2015-05-09 21:32:09,171 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@975] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-09 21:32:09,175 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@852] - Socket connection established to localhost/127.0.0.1:2181, initiating session
2015-05-09 21:32:09,181 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1235] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x14d3b6fdf7d0005, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

Here is the ZK Log:

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

2015-05-09 21:32:09,175 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /127.0.0.1:35338
2015-05-09 21:32:09,178 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /127.0.0.1:35338
2015-05-09 21:32:09,179 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0005 with negotiated timeout 30000 for client /127.0.0.1:35338
2015-05-09 21:32:17,657 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50721
2015-05-09 21:32:17,657 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50721
2015-05-09 21:32:17,658 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0006 with negotiated timeout 30000 for client /10.15.230.22:50721
2015-05-09 21:32:17,674 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50721 which had sessionid 0x14d3b6fdf7d0006
2015-05-09 21:33:22,661 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50815
2015-05-09 21:33:22,661 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50815
2015-05-09 21:33:22,662 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0007 with negotiated timeout 30000 for client /10.15.230.22:50815
2015-05-09 21:33:22,680 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50815 which had sessionid 0x14d3b6fdf7d0007
2015-05-09 21:34:22,663 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50899
2015-05-09 21:34:22,663 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50899
2015-05-09 21:34:22,664 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0008 with negotiated timeout 30000 for client /10.15.230.22:50899
2015-05-09 21:34:22,720 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50899 which had sessionid 0x14d3b6fdf7d0008
2015-05-09 21:35:22,666 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50978
2015-05-09 21:35:22,666 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50978
2015-05-09 21:35:22,669 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0009 with negotiated timeout 30000 for client /10.15.230.22:50978
2015-05-09 21:35:22,685 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50978 which had sessionid 0x14d3b6fdf7d0009
2015-05-09 21:36:22,667 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:51056
2015-05-09 21:36:22,668 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:51056
2015-05-09 21:36:22,669 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d000a with negotiated timeout 30000 for client /10.15.230.22:51056
2015-05-09 21:36:22,685 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:51056 which had sessionid 0x14d3b6fdf7d000a

[#9]

JM thank you!

I have restarted ZK but the issue still persists!

[root@DAST-master ~]# zookeeper-client
Connecting to localhost:2181
2015-05-09 21:32:09,148 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-cdh5.4.0--1, built on 04/21/2015
2015-05-09 21:32:09,150 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=master
2015-05-09 21:32:09,151 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.7.0/jre
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.ib/zookeeper/bin/../build/classes:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../build/lib/*.jar:/opt/cloudera/parcels0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j-log4j12.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j-api-1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh27/lib/zookeeper/bin/../lib/netty-3.2.2.Final.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/log4j-1.2.16.jar:dera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/jline-2.11.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeepezookeeper-3.4.5-cdh5.4.0.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../src/java/lib/*.jar:/etc/zookeeper/conf::/eper/conf:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/zookeeper-3.4.5-cdh5.4.0.jar:/opt/cloudera/parcels/CDH-5.4.0-1.p0.27/bin/../lib/zookeeper/zookeeper.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/jline-2.11.j             ls/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/netty-3.2.2.Final.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bi             /slf4j-api-1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/log4j-1.2.16.jar:/opt/cloudera/pa             .4.0.p0.27/bin/../lib/zookeeper/lib/slf4j-log4j12.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/bin/../lib/zookeeper/lib/             r
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd             lib:/usr/lib
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2015-05-09 21:32:09,152 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=2.6.32-431.el6.x86_64
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2015-05-09 21:32:09,153 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/root
2015-05-09 21:32:09,154 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessio             =org.apache.zookeeper.ZooKeeperMain$MyWatcher@2fe85210
Welcome to ZooKeeper!
JLine support is disabled
2015-05-09 21:32:09,171 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@975] - Opening socket connection              7.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-09 21:32:09,175 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@852] - Socket connection establis             .0.1:2181, initiating session
2015-05-09 21:32:09,181 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1235] - Session establishment com             ost/127.0.0.1:2181, sessionid = 0x14d3b6fdf7d0005, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

Here is the ZK Log:

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

2015-05-09 21:32:09,175 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /127.0.0.1:35338
2015-05-09 21:32:09,178 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /127.0.0.1:35338
2015-05-09 21:32:09,179 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0005 with negotiated timeout 30000 for client /127.0.0.1:35338
2015-05-09 21:32:17,657 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50721
2015-05-09 21:32:17,657 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50721
2015-05-09 21:32:17,658 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0006 with negotiated timeout 30000 for client /10.15.230.22:50721
2015-05-09 21:32:17,674 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50721 which had sessionid 0x14d3b6fdf7d0006
2015-05-09 21:33:22,661 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50815
2015-05-09 21:33:22,661 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50815
2015-05-09 21:33:22,662 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0007 with negotiated timeout 30000 for client /10.15.230.22:50815
2015-05-09 21:33:22,680 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50815 which had sessionid 0x14d3b6fdf7d0007
2015-05-09 21:34:22,663 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50899
2015-05-09 21:34:22,663 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50899
2015-05-09 21:34:22,664 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0008 with negotiated timeout 30000 for client /10.15.230.22:50899
2015-05-09 21:34:22,720 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50899 which had sessionid 0x14d3b6fdf7d0008
2015-05-09 21:35:22,666 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:50978
2015-05-09 21:35:22,666 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:50978
2015-05-09 21:35:22,669 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d0009 with negotiated timeout 30000 for client /10.15.230.22:50978
2015-05-09 21:35:22,685 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:50978 which had sessionid 0x14d3b6fdf7d0009
2015-05-09 21:36:22,667 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection from /10.15.230.22:51056
2015-05-09 21:36:22,668 INFO org.apache.zookeeper.server.ZooKeeperServer: Client attempting to establish new session at /10.15.230.22:51056
2015-05-09 21:36:22,669 INFO org.apache.zookeeper.server.ZooKeeperServer: Established session 0x14d3b6fdf7d000a with negotiated timeout 30000 for client /10.15.230.22:51056
2015-05-09 21:36:22,685 INFO org.apache.zookeeper.server.NIOServerCnxn: Closed socket connection for client /10.15.230.22:51056 which had sessionid 0x14d3b6fdf7d000a

[#10]

BTW, even when I execute the zKCli.sh script hangs, but now I am getting "connection refused" error:

[root@master ~]# /opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/zkCli.sh
Connecting to localhost:2181
2015-05-09 21:42:32,601 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-cdh5.4.0--1, built o                n 04/21/2015 19:11 GMT
2015-05-09 21:42:32,603 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=DAST-master.am.hedani.net
2015-05-09 21:42:32,603 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0
2015-05-09 21:42:32,604 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2015-05-09 21:42:32,604 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.7.0/jre
2015-05-09 21:42:32,604 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/opt/cloudera/parcels/CDH-5.                4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../build/classes:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../bu                ild/lib/*.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j-log4j12.jar:/opt/cloudera/parcels/                CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/slf4j-log4j12-1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib                /zookeeper/bin/../lib/slf4j-api-1.7.5.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/netty-3.2.2.                Final.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/log4j-1.2.16.jar:/opt/cloudera/parcels/CDH-5                .4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../lib/jline-2.11.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin                /../zookeeper-3.4.5-cdh5.4.0.jar:/opt/cloudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../src/java/lib/*.jar:/opt/c                loudera/parcels/CDH-5.4.0-1.cdh5.4.0.p0.27/lib/zookeeper/bin/../conf:
2015-05-09 21:42:32,604 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd                64:/usr/lib64:/lib64:/lib:/usr/lib
2015-05-09 21:42:32,604 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2015-05-09 21:42:32,604 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2015-05-09 21:42:32,605 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2015-05-09 21:42:32,605 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2015-05-09 21:42:32,605 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=2.6.32-431.el6.x86_64
2015-05-09 21:42:32,605 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2015-05-09 21:42:32,605 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2015-05-09 21:42:32,605 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/root
2015-05-09 21:42:32,606 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessio                nTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@49b979c0
Welcome to ZooKeeper!
JLine support is disabled
2015-05-09 21:42:32,622 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@975] - Opening socket connection                 to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-09 21:42:32,627 [myid:] - WARN  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1102] - Session 0x0 for server nu                ll, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:701)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2015-05-09 21:42:32,730 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@975] - Opening socket connection                 to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2015-05-09 21:42:32,730 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@852] - Socket connection establis                hed to localhost/127.0.0.1:2181, initiating session
2015-05-09 21:42:32,737 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1235] - Session establishment com                plete on server localhost/127.0.0.1:2181, sessionid = 0x14d3b6fdf7d0012, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null