解决namenode一直处于安全模式的问题 |
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问题:hadoop集群的namenode一直处于安全模式。 现象:开启hive时报错: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.namenode.SafeModeException): Cannot create directory /tmp/hive/xxx/01ce6751-cfbf-4120-9d63-0a2432187af2. Name node is in safe mode.解决: 1、手动关闭安全模式,但是下一次还是会处于安全模式。 (1)bin/hdfs dfsadmin -safemode get (功能描述:查看安全模式状态) (2)bin/hdfs dfsadmin -safemode enter (功能描述:进入安全模式状态) (3)bin/hdfs dfsadmin -safemode leave (功能描述:离开安全模式状态) (4)bin/hdfs dfsadmin -safemode wait (功能描述:等待安全模式状态)2、具体解决如下: (1)查看当前的hdfs的blocks的状态 hdfs fsck -blocks发现有损坏的块:
(2)手动关掉安全模式 hadoop dfsadmin -safemode leave刷新namenode界面,可看到:
(3)hadoop fs -rm -r -f 删掉损坏的blocks hadoop fs -rm -r -f /tmp/logs/xxx/logs-tfile/application_1639968661551_0015/hadoop102_40775(4)再次查看blocks的状态 hdfs fsck -blocks出现下面的界面:Status: HEALTHY Status: HEALTHY Number of data-nodes: 1 Number of racks: 1 Total dirs: 160 Total symlinks: 0 Replicated Blocks: Total size: 401578760 B Total files: 621 Total blocks (validated): 538 (avg. block size 746428 B) Minimally replicated blocks: 538 (100.0 %) Over-replicated blocks: 0 (0.0 %) Under-replicated blocks: 538 (100.0 %) Mis-replicated blocks: 0 (0.0 %) Default replication factor: 3 Average block replication: 1.0 Missing blocks: 0 Corrupt blocks: 0 Missing replicas: 1076 (66.666664 %) Erasure Coded Block Groups: Total size: 0 B Total files: 0 Total block groups (validated): 0 Minimally erasure-coded block groups: 0 Over-erasure-coded block groups: 0 Under-erasure-coded block groups: 0 Unsatisfactory placement block groups: 0 Average block group size: 0.0 Missing block groups: 0 Corrupt block groups: 0 Missing internal blocks: 0 FSCK ended at Wed Dec 08 16:51:54 CST 2021 in 20 milliseconds The filesystem under path '/' is HEALTHY查看hadoopweb端口: 安全模式关闭 块也正常了
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