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当前CentOS，JDK和Hadoop版本：
[root@master ~]# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)
[root@master ~]# java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)
[root@master ~]# hadoop version
Hadoop 3.0.3
Source code repository https://yjzhangal@git-wip-us.apache.org/repos/asf/hadoop.git -r 37fd7d752db73d984dc31e0cdfd590d252f5e075
Compiled by yzhang on 2018-05-31T17:12Z
Compiled with protoc 2.5.0
From source with checksum 736cdcefa911261ad56d2d120bf1fa
This command was run using /usr/local/hadoop/share/hadoop/common/hadoop-common-3.0.3.jar
启动遇到的坑点
问题一：
问题描述：启动hbase时报出如下Class path contains multiple SLF4J bindings错误：
[root@master ~]# start-hbase.sh
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/local/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/local/hbase/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.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]
...
解决方法：说明是这个slf4j-log4j12-1.7.25.jar和包跟其他的class path中包含的与此类似的jar包重复了，所以，应该去掉对应的jar包。
登录到每个结点上删除这个jar包即可。
[root@master ~]# rm -rf /usr/local/hbase/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.jar
[root@ceph1 ~]# rm -rf /usr/local/hbase/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.jar
[root@ceph2 ~]# rm -rf /usr/local/hbase/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.jar
[root@ceph3 ~]# rm -rf /usr/local/hbase/lib/client-facing-thirdparty/slf4j-log4j12-1.7.25.jar
问题二：
RegionServer进程启动没几秒就消失，查看日志，发现报错如下：
[root@ceph1 ~]# vim /usr/local/hbase/logs/hbase-root-regionserver-ceph1.log
2018-12-10 21:26:11,474 ERROR [main] regionserver.HRegionServer: Failed construction RegionServer
java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:635)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:619)
at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2669)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
at org.apache.hadoop.hbase.util.CommonFSUtils.getRootDir(CommonFSUtils.java:358)
at org.apache.hadoop.hbase.util.CommonFSUtils.isValidWALRootDir(CommonFSUtils.java:407)
at org.apache.hadoop.hbase.util.CommonFSUtils.getWALRootDir(CommonFSUtils.java:383)
at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeFileSystem(HRegionServer.java:691)
at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:600)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.apache.hadoop.hbase.regionserver.HRegionServer.constructRegionServer(HRegionServer.java:2991)
at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:63)
at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.run(HRegionServerCommandLine.java:87)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149)
at org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:3009)
Caused by: java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 24 more
核心问题就两句话：
1)java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
2)Caused by: java.lang.ClassNotFoundException: org.apache.htrace.SamplerBuilder
解决方法如下：
[root@ceph1 ~]# cp $HBASE_HOME/lib/client-facing-thirdparty/htrace-core-3.1.0-incubating.jar $HBASE_HOME/lib/
这里我的完整路径是：
再次启动，不论刷几次jps，妈妈再也不用担心我的HRegionServer一会就消失啦~：
[root@ceph1 ~]# hbase-daemon.sh start regionserver
[root@ceph2 ~]# hbase-daemon.sh start regionserver
[root@ceph3 ~]# hbase-daemon.sh start regionserver
问题三：
刚解决完问题二，成功启动了HRegionServer，回到主节点启动HMaster又失败了￣へ￣
HMaster进程启动没几秒就消失，查看日志，发现报错如下：
2018-02-08 17:26:54,256 ERROR [Thread-14] master.HMaster: Failed to become active master
java.lang.IllegalStateException: The procedure WAL relies on the ability to hsync for proper
operation during component failures, but the underlying filesystem does not support doing so.
Please check the config value of 'hbase.procedure.store.wal.use.hsync' to set the desired
level of robustness and ensure the config value of 'hbase.wal.dir' points to a FileSystem
mount that can provide it.
at org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore.rollWriter(WALProcedureStore.java:1044)
at org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore.rollWriter(WALProcedureStore.java:1044)
2018-12-10 22:06:39,256 ERROR [Thread-14] master.HMaster: Failed to become active master
at org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore.rollWriter(WALProcedureStore.java:1044)
at org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore.rollWriter(WALProcedureStore.java:1044)
at java.lang.Thread.run(Thread.java:748)
解决方法如下：
在hbase-site.xml中添加如下属性：
[root@master ~]# vim /usr/local/hbase/conf/hbase-site.xml
下面这个属性主要作用是禁止检查流功能(stream capabilities)[hflush/hsync]
<property>
<name>hbase.unsafe.stream.capability.enforce</name>
<value>false</value>
</property>
再次启动，不论刷几次jps，妈妈再也不用担心我的HMaster一会就消失啦~：
[root@master ~]# hbase-daemon.sh start master
