今日在练习HDFS文件的读取输出，写入，追加写入时，
读取输出，写入都没问题，在追加写入时出现了问题。
报错如下：
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2017-07-14 10:50:00,046 WARN [org.apache.hadoop.hdfs.DFSClient] - DataStreamer Exception
java.io.IOException: Failed to replace a bad datanode on the existing pipeline due to no more good datanodes being available to try. (Nodes: current=[DatanodeInfoWithStorage[192.168.153.138:50010,DS-1757abd0-ffc8-4320-a277-3dfb1022533e,DISK], DatanodeInfoWithStorage[192.168.153.137:50010,DS-ddd9a357-58d6-4c2a-921e-c16087974edb,DISK]], original=[DatanodeInfoWithStorage[192.168.153.138:50010,DS-1757abd0-ffc8-4320-a277-3dfb1022533e,DISK], DatanodeInfoWithStorage[192.168.153.137:50010,DS-ddd9a357-58d6-4c2a-921e-c16087974edb,DISK]]). The current failed datanode replacement policy is DEFAULT, and a client may configure this via 'dfs.client.block.write.replace-datanode-on-failure.policy' in its configuration.
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:918)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:992)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1160)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:455)
java.io.IOException: Failed to replace a bad datanode on the existing pipeline due to no more good datanodes being available to try. (Nodes: current=[DatanodeInfoWithStorage[192.168.153.138:50010,DS-1757abd0-ffc8-4320-a277-3dfb1022533e,DISK], DatanodeInfoWithStorage[192.168.153.137:50010,DS-ddd9a357-58d6-4c2a-921e-c16087974edb,DISK]], original=[DatanodeInfoWithStorage[192.168.153.138:50010,DS-1757abd0-ffc8-4320-a277-3dfb1022533e,DISK], DatanodeInfoWithStorage[192.168.153.137:50010,DS-ddd9a357-58d6-4c2a-921e-c16087974edb,DISK]]). The current failed datanode replacement policy is DEFAULT, and a client may configure this via 'dfs.client.block.write.replace-datanode-on-failure.policy' in its configuration.
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:918)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:992)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1160)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:455)
2017-07-14 10:50:00,052 ERROR [org.apache.hadoop.hdfs.DFSClient] - Failed to close inode 16762
java.io.IOException: Failed to replace a bad datanode on the existing pipeline due to no more good datanodes being available to try. (Nodes: current=[DatanodeInfoWithStorage[192.168.153.138:50010,DS-1757abd0-ffc8-4320-a277-3dfb1022533e,DISK], DatanodeInfoWithStorage[192.168.153.137:50010,DS-ddd9a357-58d6-4c2a-921e-c16087974edb,DISK]], original=[DatanodeInfoWithStorage[192.168.153.138:50010,DS-1757abd0-ffc8-4320-a277-3dfb1022533e,DISK], DatanodeInfoWithStorage[192.168.153.137:50010,DS-ddd9a357-58d6-4c2a-921e-c16087974edb,DISK]]). The current failed datanode replacement policy is DEFAULT, and a client may configure this via 'dfs.client.block.write.replace-datanode-on-failure.policy' in its configuration.
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:918)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:992)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1160)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:455)
添加上
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之后报错如下：
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException): Failed to APPEND_FILE /weather/output/abc.txt for DFSClient_NONMAPREDUCE_1964095166_1 on 192.168.153.1 because this file lease is currently owned by DFSClient_NONMAPREDUCE_-590151867_1 on 192.168.153.1
然后再添加
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完事就没问题了。
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