HBase cannot connect to ZooKeeper
The following error is reported when you log on to the server after setting up the HBase Environment last time:
Hadoop @ gpmaster logs] $ hbase shell
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar: file:/home/hadoop/hbase-1.0.1.1/lib/slf4j-log4j12-1.7.7.jar! /Org/slf4j/impl/StaticLoggerBinder. class]
SLF4J: Found binding in [jar: file:/home/hadoop/hadoop-2.6.0/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar! /Org/slf4j/impl/StaticLoggerBinder. class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org. slf4j. impl. Log4jLoggerFactory]
17:27:40, 516 WARN [main] util. NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
HBase Shell; enter 'help <RETURN> 'for list of supported commands.
Type "exit <RETURN>" to leave the HBase Shell
Version 1.0.1.1, re1dbf4df30d214fca14908df71d038081577ea46, Sun May 17 12:34:26 PDT 2015
Hbase (main): 001: 0> status
ERROR: org. apache. hadoop. hbase. PleaseHoldException: Master is initializing
At org. apache. hadoop. hbase. master. HMaster. checkInitialized (HMaster. java: 1875)
At org. apache. hadoop. hbase. master. MasterRpcServices. getClusterStatus (MasterRpcServices. java: 691)
At org. apache. hadoop. hbase. protobuf. generated. MasterProtos $ MasterService $2. callBlockingMethod (MasterProtos. java: 42406)
At org. apache. hadoop. hbase. ipc. RpcServer. call (RpcServer. java: 2031)
At org. apache. hadoop. hbase. ipc. CallRunner. run (CallRunner. java: 107)
At org. apache. hadoop. hbase. ipc. RpcExecutor. consumerLoop (RpcExecutor. java: 130)
At org. apache. hadoop. hbase. ipc. RpcExecutor $ 1.run( RpcExecutor. java: 107)
At java. lang. Thread. run (Thread. java: 745)
Here is some help for this command:
Show cluster status. Can be 'summary ', 'simple', 'detailed', or 'replicase'.
Default is 'summary '. Examples:
Hbase> status
Hbase> status 'simple'
Hbase> status 'summary'
Hbase> status 'detailled'
Hbase> status 'replicase'
Hbase> status 'replicase', 'source'
Hbase> status 'replicase', 'sind'
Hbase (main): 002: 0>
After viewing the log/home/hadoop/hbase-1.0.1.1/logs/hbase-hadoop-regionserver-gpmaster.log,
Key error information found:
Client. HConnectionManager $ HConnectionImplementation: Can't get connection to ZooKeeper: keeperrorcode = ConnectionLoss for/hbase.
Based on the information, we can determine that zk cannot be connected. Run jps to check whether zk is normal. Check that the zk node configuration in the hbase-site.xml is normal. According to experience, the firewall is not closed and port 2181 cannot be accessed.
Run service iptables stop to disable the firewall and restart hbase. Go to hbase shell and execute list:
Hbase (main): 001: 0> list
TABLE
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar: file:/root/hadoop/hbase/lib/slf4j-log4j12-1.6.4.jar! /Org/slf4j/impl/StaticLoggerBinder. class]
SLF4J: Found binding in [jar: file:/root/hadoop/hadoop-2.2.0/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar! /Org/slf4j/impl/StaticLoggerBinder. class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
14:06:26, 013 WARN [main] util. NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
0 row (s) in 1.0070 seconds
=> []
In this way, everything is normal.
