Hadoop常见问题及解决⽅法汇总
1、ERROR: Unable to write in /opt/hadoop-3.3.0/logs. Aborting. Starting datanodes
解决：sudo chown -R hadoop:hadoop /usr/local/hadoop
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2、790 WARN util.NativeCodeLoader: Unable to load native-hadoop library for you
解决：/opt/hadoop-3.3.0/etc/hadoop/log4j.properties添加apache.hadoop.util.NativeCodeLoader=ERROR
3、localhost: ERROR: Cannot t priority of datanode process
<property>
<name>dfs.name.dir</name>
<value>/opt/hadoop-3.3.0/hdfsDir/name</value>
had
<description>datanode上存储hdfs名字空间元数据</description>
</property>
<property>
<name>dfs.data.dir</name>
<value>/opt/hadoop-3.3.0/hdfsDir/data</value>
建筑英文翻译
<description>datanode上数据块的物理存储位置</description>怎么安慰男朋友
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</property>
4、Cannot create Name node is in safe mode.
hadoop dfsadmin -safemode leave
5、There are 0 datanode(s) running and 0 node(s) are excluded in this operation.
vain找到hadoop安装⽬录下./data/dfs/data⾥⾯的current⽂件夹删除
drumstick
然后从新执⾏⼀下 hadoop namenode -format
brookfield6、ERROR org.apache.hadoop.hdfs.rver.namenode.SecondaryNameNode: Failed to start condary namenode
呢喃的拼音hadoop⽂件夹下的data和name⽂件夹⾥⾯的current/version，发现clusterID不⼀致.
轻音乐 mp3错误原因：多次错误初始化NameNode，导致namenode和datanode的namespaceID和clusterID不⼀致
解决⽅法：删除hdfs中配置的data⽬录下的所有⽂件（l中配置的p.dir）
1、删除Hadoop⽂件夹…/tmp/dfs ⾥⾯的data和name⽂件夹
2、初始化NameNode：hdfs namenode -format
3、启动HDFS：start-dfs.sh
