错误信息：
015-12-24 10:57:26,527 INFO [main] mortbay.log: jetty-6.1.26.cloudera.4
2015-12-24 10:57:26,553 WARN [main] mortbay.log: tmpdir
java.io.IOException: Permission denied
at java.io.UnixFileSystem.createFileExclusively(Native Method)
at java.io.File.createTempFile(File.java:2001)
at java.io.File.createTempFile(File.java:2047)
at org.mortbay.jetty.webapp.WebAppContext.getTempDirectory(WebAppContext.java:784)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:491)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at org.apache.hadoop.hbase.http.HttpServer.start(HttpServer.java:956)
at org.apache.hadoop.hbase.http.InfoServer.start(InfoServer.java:91)
at org.apache.hadoop.hbase.regionserver.HRegionServer.putUpWebUI(HRegionServer.java:1719)
at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:566)
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:526)
at org.apache.hadoop.hbase.regionserver.HRegionServer.constructRegionServer(HRegionServer.java:2515)
at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:64)
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:126)
at org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:2532)
原因：
hbase-regionserver启动时默认会在/tmp/目录下锁文件和进程文件，jetty的临时文件。意外关闭没有清理临时文件导致无法启动。
清理hbase相关的目录,如下图
