HBase创建快照(snapshot)出现异常的处理方法，hbasesnapshot


今天在hbase中创建快照的时候遇到了如下错误：

hbase(main):004:0> snapshot 'booking', 'booking-snapshot-20140912'

ERROR: org.apache.hadoop.hbase.snapshot.HBaseSnapshotException: Snapshot { ss=booking-snapshot-20140912 table=booking type=FLUSH } had an error.  Procedure booking-snapshot-20140912 { waiting=[hbase1.data.cn,60020,1407930968832, hbase45.data.cn,60020,1408609189376, hbase23.data.cn,60020,1407930978740, hbase37.data.cn,60020,1408608587411, hbase46.data.cn,60020,1408609190515, hbase6.data.cn,60020,1407930958926, hbase44.data.cn,60020,1408609188252, hbase7.data.cn,60020,1407930960021, hbase49.data.cn,60020,1408609193897, hbase47.data.cn,60020,1408609191647, hbase21.data.cn,60020,1407930976874, hbase39.data.cn,60020,1408608669063, hbase13.data.cn,60020,1407930966976, hbase15.data.cn,60020,1407930969235, hbase19.data.cn,60020,1407930973863, hbase16.data.cn,60020,1407930971152, hbase18.data.cn,60020,1407930972762, hbase43.data.cn,60020,1408609187126, hbase12.data.cn,60020,1407930966365, hbase10.data.cn,60020,1407930963512, hbase3.data.cn,60020,1407930955378, hbase11.data.cn,60020,1407930965112, hbase24.data.cn,60020,1407930979654, hbase2.data.cn,60020,1407930954308, hbase9.data.cn,60020,1407930962354, hbase38.data.cn,60020,1408608663894, hbase40.data.cn,60020,1408608674240, hbase41.data.cn,60020,1408609184867, hbase4.data.cn,60020,1407930956670, hbase36.data.cn,60020,1408608406292, hbase17.data.cn,60020,1407930972505, hbase35.data.cn,60020,1408607982898, hbase20.data.cn,60020,1407930974993, hbase48.data.cn,60020,1408609192763, hbase22.data.cn,60020,1407930978159, hbase8.data.cn,60020,1407930961333] done=[] }
	at org.apache.hadoop.hbase.master.snapshot.SnapshotManager.isSnapshotDone(SnapshotManager.java:342)
	at org.apache.hadoop.hbase.master.HMaster.isSnapshotDone(HMaster.java:2905)
	at org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:40494)
	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2012)
	at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:98)
	at org.apache.hadoop.hbase.ipc.FifoRpcScheduler$1.run(FifoRpcScheduler.java:73)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: org.apache.hadoop.hbase.errorhandling.ForeignException$ProxyThrowable via timer-java.util.Timer@69db0cb4:org.apache.hadoop.hbase.errorhandling.ForeignException$ProxyThrowable: org.apache.hadoop.hbase.errorhandling.TimeoutException: Timeout elapsed! Source:Timeout caused Foreign Exception Start:1410453067992, End:1410453127992, diff:60000, max:60000 ms
	at org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher.rethrowException(ForeignExceptionDispatcher.java:83)
	at org.apache.hadoop.hbase.master.snapshot.TakeSnapshotHandler.rethrowExceptionIfFailed(TakeSnapshotHandler.java:320)
	at org.apache.hadoop.hbase.master.snapshot.SnapshotManager.isSnapshotDone(SnapshotManager.java:332)
	... 10 more
Caused by: org.apache.hadoop.hbase.errorhandling.ForeignException$ProxyThrowable: org.apache.hadoop.hbase.errorhandling.TimeoutException: Timeout elapsed! Source:Timeout caused Foreign Exception Start:1410453067992, End:1410453127992, diff:60000, max:60000 ms
	at org.apache.hadoop.hbase.errorhandling.TimeoutExceptionInjector$1.run(TimeoutExceptionInjector.java:70)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)
出现这种问题的原因是因为和服务器通信超时导致的。所以需要将下面两个参数的默认值进行调整。

1、hbase.snapshot.region.timeout

2、hbase.snapshot.master.timeoutMillis

这两个值的默认值为60000，单位是毫秒，也即1min。如果通信时间超过该值，就会报上面的错误。


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snapshot，据我所知，在linux下其实就是设备映射的一种类型，一般来说，对origin设备做snapshot，就是创建一个cow设备文件，然后用dmsetup做个snapshot的映射就行了，那么执行时间就是dd出cow设备文件的时间，要是加上seek参数的话，不会实际占用磁盘空间，只是标识该文件的大小，于是就瞬间完成了，不知道在虚拟机中snapshot是怎么创建管理的，
 

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新建工程目录，按工程目录路径导出就好了！原来版本的MAYA可以导出到别的路径，我刚用2012也是这情况，不过导出到工程目录中的images中就没有问题啦！

 

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