hadoop强制进行Active/Standby切换的命令

本文介绍如何使用特定命令在HDFS中强制手动地将NameNode从备用状态转换为主动状态,或者反之。

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hdfs haadmin -transitionToActive/transitionToStandby -forcemanual nn1
2025-03-22 21:22:25,122 WARN namenode.NameNode: Encountered exception during format java.io.IOException: Cannot create directory /opt/hadoop/tmp/dfs/name/current at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.clearDirectory(Storage.java:447) at org.apache.hadoop.hdfs.server.namenode.NNStorage.format(NNStorage.java:591) at org.apache.hadoop.hdfs.server.namenode.NNStorage.format(NNStorage.java:613) at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:189) at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1285) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1733) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1841) 2025-03-22 21:22:25,166 INFO namenode.FSNamesystem: Stopping services started for active state 2025-03-22 21:22:25,167 INFO namenode.FSNamesystem: Stopping services started for standby state 2025-03-22 21:22:25,169 ERROR namenode.NameNode: Failed to start namenode. java.io.IOException: Cannot create directory /opt/hadoop/tmp/dfs/name/current at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.clearDirectory(Storage.java:447) at org.apache.hadoop.hdfs.server.namenode.NNStorage.format(NNStorage.java:591) at org.apache.hadoop.hdfs.server.namenode.NNStorage.format(NNStorage.java:613) at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:189) at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1285) at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1733) at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1841) 2025-03-22 21:22:25,179 INFO util.ExitUtil: Exiting with status 1: java.io.IOException: Cannot create directory /opt/hadoop/tmp/dfs/name/current 2025-03-22 21:22:25,207 INFO namenode.NameNode: SHUTDOWN_MSG:
03-23
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