Hadoop 配置yarn常見錯誤

hadoop環境為一主三從，在namenode上啟用yarn，配置yarn-site.xml，三個從節點yarn-site.xml配置檔案為空。

yarn-site.xml的內容如下

yarn.nodemanager.aux-services

mapreduce_shuffle
yarn.nodemanager.aux-services.mapreduce.shuffle.class
org.apache.hadoop.mapred.shufflehandler
yarn.resourcemanager.address
node01:8032
yarn.resourcemanager.scheduler.address
node01:8030
yarn.resourcemanager.resource-tracker.address
node01:8035
yarn.resourcemanager.admin.address
node01:8033

yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar pi 2 1

vi hadoop/logs/yarn-root-nodemanager-node03.log

2019-10-18 23:21:36,604 info org.apache.hadoop.ipc.client: retrying connect to server: 0.0.0.0/0.0.0.0:8031. already tried 9 time(s); retry policy is retryuptomaximumcountwithfixedsleep(maxretries=10, sleeptime=1000 milliseconds)

這個錯誤的意思是 hadoop節點時間的時間不同步

解決方法：通過以下命令將每個節點的時間都設為一致

date -s '2019-10-18 22:49:00'

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