org.apache.hadoop.yarn.client.RMProxy - Connecting to ResourceManager at /0.0.0.0:8032
问题
flink-session启动无法连接到hadoop的resourceManager
尝试重新连接Retrying connect to server: 0.0.0.0/0.0.0.0:8032. Already tried 0 time(s)失败.
2021-03-19 07:43:15,103 WARN org.apache.flink.runtime.util.HadoopUtils - Could not find Hadoop configuration via any of the supported methods (Flink configuration, environment variables).
2021-03-19 07:43:15,545 WARN org.apache.hadoop.util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
2021-03-19 07:43:15,657 INFO org.apache.flink.runtime.security.modules.HadoopModule - Hadoop user set to ryxiong (auth:SIMPLE), credentials check status: true
2021-03-19 07:43:15,715 INFO org.apache.flink.runtime.security.modules.JaasModule - Jaas file will be created as /tmp/jaas-1195372589162118065.conf.
2021-03-19 07:43:15,734 WARN org.apache.flink.yarn.cli.FlinkYarnSessionCli - The configuration directory ('/opt/module/flink-1.10.1/conf') already contains a LOG4J config file.If you want to use logback, then please delete or rename the log configuration file.
2021-03-19 07:43:15,802 INFO org.apache.hadoop.yarn.client.RMProxy - Connecting to ResourceManager at /0.0.0.0:8032
2021-03-19 07:43:27,189 INFO org.apache.hadoop.ipc.Client - Retrying connect to server: 0.0.0.0/0.0.0.0:8032. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2021-03-19 07:43:28,195 INFO org.apache.hadoop.ipc.Client - Retrying connect to server: 0.0.0.0/0.0.0.0:8032. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2021-03-19 07:43:29,201 INFO org.apache.hadoop.ipc.Client - Retrying connect to server: 0.0.0.0/0.0.0.0:8032. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
原因:
1.检查是否启动hadoop集群, 如果没有启动, 是无法连接到hadoop的yarn
2.flink运行于yarn上，flink要能找到hadoop配置，因为要连接到yarn的resourcemanager和hdfs。
如果正常启动还无法连接yarn, 可以查看一下hadoop的环境变量是否配置好
解决方案:
1.启动hadoop集群
2.配置hadoop的环境变量
# HADOOP_HOME
export HADOOP_HOME=/opt/module/hadoop-2.7.2
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin
问题解决.