HBASE启动失败
org.apache.hadoop.hbase.ClockOutOfSyncException: org.apache.hadoop.hbase.ClockOutOfSyncException: Server hadoop74,60020,1372320861420 has been rejected; Reported time is too far out of sync with master. Time difference of 143732ms > max allowed of 30000ms
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:95)
at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:79)
at org.apache.hadoop.hbase.regionserver.HRegionServer.reportForDuty(HRegionServer.java:2093)
at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:744)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hbase.ClockOutOfSyncException: Server hadoop74,60020,1372320861420 has been rejected; Reported time is too far out of sync with master. Time difference of 143732ms > max allowed of 30000ms
原因：时间不一致造成的
解决方案1：
配置：hbase.master.maxclockske
<property>
<name>hbase.master.maxclockskew</name>
<value>200000</value>
<description>Time difference of regionserver from master</description>
</property>
解决方案2：
修改个节点时间
hbase并发问题
2012-06-01 16:05:22,776 INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: 打开的文件过多
2012-06-01 16:05:22,776 INFO org.apache.hadoop.hdfs.DFSClient: Abandoning block blk_3790131629645188816_18192
2012-06-01 16:13:01,966 WARN org.apache.hadoop.hdfs.DFSClient: DFS Read: java.io.IOException: Could not obtain block: blk_-299035636445663861_7843 file=/hbase/SendReport/83908b7af3d5e3529e61b870a16f02dc/data/17703aa901934b39bd3b2e2d18c671b4.9a84770c805c78d2ff19ceff6fecb972
at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1812)
at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1638)
at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1767)
at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1695)
at java.io.DataInputStream.readBoolean(DataInputStream.java:242)
at org.apache.hadoop.hbase.io.Reference.readFields(Reference.java:116)
at org.apache.hadoop.hbase.io.Reference.read(Reference.java:149)
at org.apache.hadoop.hbase.regionserver.StoreFile.<init>(StoreFile.java:216)
at org.apache.hadoop.hbase.regionserver.Store.loadStoreFiles(Store.java:282)
at org.apache.hadoop.hbase.regionserver.Store.<init>(Store.java:221)
at org.apache.hadoop.hbase.regionserver.HRegion.instantiateHStore(HRegion.java:2510)
at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:449)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3228)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3176)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:331)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:107)
at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
原因及修改方法：由于 Linux系统最大可打开文件数一般默认的参数值是1024，通过 ulimit -n 65535 可即时修改，但重启后就无效了。或者有如下修改方式：
有如下三种修改方式：
1.在/etc/rc.local 中增加一行 ulimit -SHn 65535
2.在/etc/profile 中增加一行 ulimit -SHn 65535
3.在/etc/security/limits.conf最后增加如下两行记录
* soft nofile 65535
* hard nofile 65535
如果hadoop版本不是hbase默认对于版本，运行phoenix异步索引MR会报错
2017-07-13 21:18:41,438 INFO [main] mapreduce.Job: Job job_1498447686527_0002 running in uber mode : false
2017-07-13 21:18:41,439 INFO [main] mapreduce.Job: map 0% reduce 0%
2017-07-13 21:18:55,554 INFO [main] mapreduce.Job: map 100% reduce 0%
2017-07-13 21:19:05,642 INFO [main] mapreduce.Job: map 100% reduce 100%
2017-07-13 21:19:06,660 INFO [main] mapreduce.Job: Job job_1498447686527_0002 completed successfully
2017-07-13 21:19:06,739 ERROR [main] index.IndexTool: An exception occurred while performing the indexing job: IllegalArgumentException: No enum constant org.apache.hadoop.mapreduce.JobCounter.MB_MILLIS_REDUCES at:
java.lang.IllegalArgumentException: No enum constant org.apache.hadoop.mapreduce.JobCounter.MB_MILLIS_REDUCES
at java.lang.Enum.valueOf(Enum.java:236)
使用./hbase classpath 查看hbase使用的jar包路径，我用的habse0.98默认对应hadoop2.2.0，而我的是2.6.4版本，解决办法是移出hbase/lib下的hadoop*,删除outpath或者重新指定outpath运行该MR，运行完刷新索引，索引表就可用了。
phoenix查询count租约过期问题
首先租约过期解决方案，将租约时间增加：
首先租约过期解决方案，将租约时间增加：
划拉到底，增加时间到3分钟
将统计count（参数）中的参数用1代替，如select count(1) from ehrmain;
重启hadoop时namenode启动失败
部分日志：
This node has namespaceId '1770688123 and clusterId 'CID-57ffa982-419d-4c6a-81a1-d59761366cd1' but the requesting node expected '1974358097' and 'CID-57ffa982-419d-4c6a-81a1-d59761366cd1'
2017-04-25 19:20:01,508 WARN org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer: Edit log tailer interrupted
java.lang.InterruptedException: sleep interrupted
-------做的操作
停掉所有的进程，修改core-site.xml中的ipc参数
<property>
<name>ipc.client.connect.max.retries</name>
<value>100</value>
</property>
<property>
<name>ipc.client.connect.retry.interval</name>
<value>10000</value>
</property>
备份namenode的current，格式化namenode，将备用namenode的current替换成格式化后的namenode的current，修改journal的current中的VERSION的namespaceID和clusterID，使其值与namenode的VERSION对应值一致重启hadoop
小松鼠连接不上
重启hbase后数据查不到，小松鼠客户端连接不上，hbase shell扫描报错：ERROR: org.apache.hadoop.hbase.exceptions.RegionOpeningException: Region ADVICE,,1484647165178.b827fafe905eda29996dfb56bd9fd61f. is opening on hadoop79,60020,1497005577348
Region EHRMAIN,,1489599097179.61688929e93c5143efbe19b68f995c76. is not online on hadoop79,60020,1497002696781
phoenix报错：is opening on hadoop78,60020
命令hbase hbck：出现大量异常信息
解决办法：关掉hbase集群，在每个RegionServer上的hbase-site.xml配置文件里面增加如下
<property>
<name>hbase.regionserver.executor.openregion.threads</name>
<value>100</value>
</property>
重启hbase集群，命令hbase hbck：Summary:
Table CONSULTATIONRECORD is okay.
Number of regions: 6
Deployed on: hadoop76,60020,1497006965624 hadoop77,60020,1497006965687 hadoop78,60020,1497006965700 hadoop79,60020,1497006965677
Table PT_LABREPORT is okay.所有表都ok。
注：hbase hbck -fix可以修复hbase数据不一致
无法启动datanode问题
hadoop集群启动start-all.sh的时候，slave总是无法启动datanode，并会报错：… could only be replicated to 0 nodes, instead of 1 … 就是有节点的标识可能重复。也可能有其他原因，以下解决方法请依次尝试。
解决方法：
1).删除所有节点dfs.data.dir和dfs.tmp.dir目录（默认为tmp/dfs/data和tmp/dfs/tmp）下的数据文件；然后重新hadoop namenode -format 格式化节点；然后启动。
2).如果是端口访问的问题，你应该确保所用的端口都打开，比如hdfs://machine1:9000/、50030、50070之类的。执行#iptables -I INPUT -p tcp –dport 9000 -j ACCEPT 命令。如果还有报错：hdfs.DFSClient: Exception in createBlockOutputStream java.net.ConnectException: Connection refused；应该是datanode上的端口不能访问，到datanode上修改iptables：#iptables -I INPUT -s machine1 -p tcp -j ACCEPT
3).还有可能是防火墙的限制集群间的互相通信。尝试关闭防火墙。/etc/init.d/iptables stop
4).最后还有可能磁盘空间不够了，请查看 df -al
权限问题导致的启动失败
ERROR namenode.NameNode: java.io.IOException: Cannot create directory /export/home/dfs/name/current
ERROR namenode.NameNode: java.io.IOException: Cannot remove current directory: /usr/local/hadoop/hdfsconf/name/current
原因是 没有设置 /usr/hadoop/tmp 的权限没有设置， 将之改为：
chown –R hadoop:hadoop /usr/hadoop/tmp
sudo chmod -R a+w /usr/local/hadoop
Hadoop格式化HDFS报错
此报错一般是配置中定义的相关name和data文件夹没有创建或者权限不足，也有可能是曾经其他版本使用过的文件夹，解决办法，如果已有删除重建，没有就创建这两个文件夹，保证是当前用户创建的，再重新格式化即可。
MR操作hbase
java.lang.ClassNotFoundException: org.apache.hadoop.hbase.protobuf.generated.ClientProtos$Result
解决办法：hbase少了protobuf的jar包
删除hbase的jar包，重新导入全部hbase*.jar
---------------------------------------
java.lang.NoClassDefFoundError: org/cloudera/htrace/Trace
导入htrace包
phoenix报错
WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
查看hadoop/lib目录，发现用户是500 500，修改 chown root.root -R *
重启系统，启动所有组建../sqlline.py 192.168.204.111 启动成功
-------------------------------
如若报错而且很长时间才启动 Can't get master address from ZooKeeper; znode data == null
--hbase master挂了
phoenix启动报错：Error: org.apache.hadoop.hbase.DoNotRetryIOException: Class org.apache.phoenix.coprocessor.MetaDataRegionObserver cannot be loaded Set hbase.table.sanity.checks to false at conf or table descriptor if you want to bypass sanity checks
必须重启hbase包括Hmaster
phoenix报错：Error: ERROR 1012 (42M03): Table undefined. tableName=ZLH_PERSON (state=42M03,code=1012)
查看是否存在TABLE_SCHEM，写上就好了
0: jdbc:phoenix:hadoop74,hadoop75,hadoop76:21> select * from test.zlh_person;
+------+-------+------+
| ID | NAME | AGE |
+------+-------+------+
| 100 | 灏忕孩 | 18 |
+------+-------+------+
hbase-0.98.21/bin/stop-hbase.sh
stopping hbasecat: /tmp/hbase-hadoop-master.pid: No such file or directory
原因是，默认情况下pid文件保存在/tmp目录下，/tmp目录下的文件很容易丢失（重启后基本就会删除），解决办法：在hbase-env.sh中修改pid文件的存放路径
[java]
# The directory where pid files are stored. /tmp by default.
export HBASE_PID_DIR=/var/hadoop/pids
hadoop中
no namenode to stop hadoop关闭找不到pid，修改集群中hadoop-env.sh和yarn-daemon.sh中的pid选项即可
2016-09-09 15:32:59,380 WARN [main-SendThread(hadoop74:2181)] zookeeper.ClientCnxn: Session 0x0 for server hadoop74/172.18.3.74:2181, unexpected error, closing socket connection and attempting reconnect
java.io.IOException: Connection reset by peer
连不上zookeeper，查看zookeeper的日志文件有报too many connections from host - max is 10 的错误，因为hbase连接zookeeper的连接数太多，默认zookeeper给每个客户端IP使用的连接数为10个，目前每个regionserver有三百个region，stop zookeeper修改zoo.cfg：maxClientCnxns=300，重启zookeeper
ambari部署集群ssh主机注册时不成功，查看日志Ambari agent machine hostname (localhost.localdomain) does not match expected ambari server hostname (hadoop-node-101). Aborting registration.
发现/etc/hosts文件有问题，hostname之间不是空格 localhost和hostname都放在了最后，修改成正确的hosts文件后解决
正确格式：
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
172.18.*.* hadoop-node-*
..............
ambari的phoenix版本太低不支持分页问题解决
1、删除phoenix相关的表
2、hbase shell删除phoenix四个系统表（"SYSTEM.CATALOG", "SYSTEM.FUNCTION", "SYSTEM.SEQUENCE", "SYSTEM.STATS"）
3、修改相应的phoenix jar包名替换ambari的phoenix jar
phoenix-4.4.0.2.4.2.0-258-client.jar,phoenix-core-4.4.0.2.4.2.0-258-tests.jar,phoenix-server-client-4.4.0.2.4.2.0-258.jar,phoenix-4.4.0.2.4.2.0-258-thin-client.jar,phoenix-server-4.4.0.2.4.2.0-258.jar,phoenix-core-4.4.0.2.4.2.0-258.jar,phoenix-server-4.4.0.2.4.2.0-258-tests.jar
4、小松鼠加入新jar重建驱动（phoenix-4.4.0.2.4.2.0-258-client.jar,phoenix-server-4.4.0.2.4.2.0-258.jar,phoenix-core-4.4.0.2.4.2.0-258.jar）
5、关闭hbase,修改 Advanced hbase-site下的RegionServer WAL Codec：org.apache.hadoop.hbase.regionserver.wal.IndexedWALEditCodec
6、重启hbase
java.lang.NoSuchMethodError: org.apache.hadoop.conf.Configuration.addDeprecations([Lorg/apache/hadoop/conf/Configuration$DeprecationDelta;)V
缺少hadoop-mapreduce-client-core-2.2.0.jar包
hbase宕机does not exist or is not under Constructionblk_1075156057_1415896
设置-XX:CMSInitiatingOccupancyFraction=60，提早cms进行老生带的回收，减少cms的时间