Yes,the reduce's log get this exception:
----------------------------------------
2016-05-06 09:33:29,020 INFO [main] org.apache.zookeeper.ZooKeeper: Client
environment:user.home=/home/hadoop
2016-05-06 09:33:29,020 INFO [main] org.apache.zookeeper.ZooKeeper: Client
environment:user.dir=/var/u01/hadoop/yarn_dir/local/usercache/hadoop/appcache/application_1461663034262_4223/container_1461663034262_4223_01_000019
2016-05-06 09:33:29,021 INFO [main] org.apache.zookeeper.ZooKeeper:
Initiating client connection, connectString=localhost:2181
sessionTimeout=180000 watcher=hconnection-0x24fc81b40x0,
quorum=localhost:2181, baseZNode=/hbase
2016-05-06 09:33:29,221 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:29,223 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, 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:739)
at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-06 09:33:29,329 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:29,329 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected
error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-06 09:33:29,335 INFO [main]
org.apache.hadoop.hbase.util.RetryCounter: Sleeping 1000ms before retry
#0...
2016-05-06 09:33:30,430 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:30,431 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, 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:739)
at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-06 09:33:30,531 INFO [main]
org.apache.hadoop.hbase.util.RetryCounter: Sleeping 2000ms before retry
#1...
2016-05-06 09:33:30,531 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:30,532 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected
error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-06 09:33:31,632 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:31,633 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, 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:739)
at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-06 09:33:31,733 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:31,734 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected
error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-06 09:33:32,835 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:32,835 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, 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:739)
at
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2016-05-06 09:33:32,936 INFO [main]
org.apache.hadoop.hbase.util.RetryCounter: Sleeping 4000ms before retry
#2...
2016-05-06 09:33:32,936 INFO [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL
(unknown error)
2016-05-06 09:33:32,936 WARN [main-SendThread(localhost:2181)]
org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected
error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
--------------------------------------------------------------------------
But My HBase's config has this option:
<property>
<name>hbase.zookeeper.quorum</name>
<value>hadoop21:2181,hadoop25:2181,hadoop37:2181,hadoop45:2181,hadoop140:2181</value>
</property>
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