一、執行$ hbase hbck 命令時，出現以下提示：
Invalid maximum heap size: -Xmx4096m
The specified size exceeds the maximum representable size.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
原因：jvm設置的內存過大，減小配置文件hbase-env.sh內的設置即可。例如：
export HBASE_HEAPSIZE=1024
二、無法啟動hbase，regionserver log里會有這樣的錯誤，zookeeper也有初始化問題的錯誤
FATAL org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING region server 10.210.70.57,60020,1340088145399: Initialization of RS failed. Hence aborting RS.
因為之前安裝配置的時候是好好的，中間經歷過強行kill daemon的過程，又是報錯初始化問題，所以估計是有緩存影響了，所以清理了tmp里的數據，然后發現HRegionServer依然無法啟動，不過還好的是zookeeper啟動了，一怒之下把hdfs里的hbase數據也都清理了，同時再清理tmp，檢查各個節點是否有殘留hbase進程，kill掉，重啟hbase，然后這個世界都正常了。不知道具體哪里影響了，不推薦這種暴力解決辦法，如果有誰知道原因請告之。
三、無法啟動reginserver daemon，報錯如下：
Exception in thread "main" java.lang.RuntimeException: Failed construction of Regionserver: class org.apache.hadoop.hbase.regionserver.HRegionServer
...
Caused by: java.net.BindException: Problem binding to /10.210.70.57:60020 : Cannot assign requested address
根據錯誤提示，檢查ip對應的機器是否正確，如果出錯機器的ip正確，檢查60020端口是否被占用。
四、執行hbase程序orshell命令出現如下提示：
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/hbase-0.92.1/lib/slf4j-log4j12-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/hadoop-1.0.3/lib/slf4j-log4j12-1.4.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
是因為hbase和hadoop里都有這個jar包，選擇其一移除即可。
五、執行hbase的mapreduce作業，有些節點無任何報錯正常執行，有些節點總報類似Status : FAILED
java.lang.NullPointerException的錯誤，查看tasktracker的log日志有如下錯誤：
WARN org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
...
caused by java.net.ConnectException: Connection refused
官方對這個錯誤給了說明，
Errors like this... are either due to ZooKeeper being down, or unreachable due to network issues.
當初配置zookeeper時只說盡量配置奇數節點防止down掉一個節點無法選出leader，現在看這個問題貌似所以想執行任務的節點都必須配置zookeeper啊。
六、報告找不到方法異常，但是報告的函數並非自己定義的，也並沒有調用這樣的函數，類似信息如下：
java.lang.RuntimeException: java.lang.NoSuchMethodException: com.google.hadoop.examples.Simple$MyMapper.()
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:45)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:32)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:53)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:209)
at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1210)
Caused by: java.lang.NoSuchMethodException: com.google.hadoop.examples.Simple$MyMapper.()
at java.lang.Class.getConstructor0(Class.java:2705)
at java.lang.Class.getDeclaredConstructor(Class.java:1984)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:41)
... 4 more
網上找到解決方法如下：
This is actually the() function. The display on the web page doesn't translate into html, but dumps plain text, sois treated as a (nonexistant) tag by your browser. This function is created as a default initializer for non-static classes. This is most likely caused by having a non-static Mapper or Reducer class. Try adding the static keyword to your class declaration, ie:
意思是缺少static關鍵字～添加上即可。如下：
public static class MyMapper extends MapReduceBase implements Mapper {...}
七、使用mapreduce程序寫HFile操作hbase時，可能會有這樣的錯誤：
java.lang.IllegalArgumentException: Can't read partitions file
...
Caused by: java.io.IOException: wrong key class: org.apache.hadoop.io.*** is not class org.apache.hadoop.hbase.io.ImmutableBytesWritable
這里需要注意的是無論是map還是reduce作為最終的輸出結果，輸出的key和value的類型應該是：< ImmutableBytesWritable, KeyValue> 或者< ImmutableBytesWritable, Put>。改成這樣的類型就行了。
八、如果啟動hbase集群出現regionserver無法啟動，日志報告如下類似錯誤時，說明是集群的時間不同步，只需要同步即可解決。
FATAL org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING region server 10.210.78.22,60020,1344329095415: Unhandled exceptio
n: org.apache.hadoop.hbase.ClockOutOfSyncException: Server 10.210.78.22,60020,1344329095415 has been rejected; Reported time is too far out of sync with mast
er. Time difference of 90358ms > max allowed of 30000ms
org.apache.hadoop.hbase.ClockOutOfSyncException: org.apache.hadoop.hbase.ClockOutOfSyncException: Server 10.210.78.22,60020,1344329095415 has been rejected;
Reported time is too far out of sync with master. Time difference of 90358ms > max allowed of 30000ms
......
Caused by: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hbase.ClockOutOfSyncException: Server 10.210.78.22,60020,1344329095415 has been rejected;
Reported time is too far out of sync with master. Time difference of 90358ms > max allowed of 30000ms
只需要執行一下這條命令即可同步國際時間：
/usr/sbin/ntpdate tick.ucla.edu tock.gpsclock.com ntp.nasa.gov timekeeper.isi.edu usno.pa-x.dec.com;/sbin/hwclock --systohc > /dev/null