问题描述：调度系统执行hive任务失败，一直执行失败，报错如下：
java.io.IOException: java.net.ConnectException: Call From #HostName/#IP to #HostName:10020 Failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
Caused by: java.net.ConnectException: Call From #HostName/#IP to #HostName:10020 Failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
CONSOLE# Ended Job = job_1638255473937_0568 with exception 'java.io.IOException(java.net.ConnectException: Call From #HostName/#IP to #HostName:10020 Failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused)
CONSOLE# Failed: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask. java.net.ConnectException: Call From #HostName/#IP to #HostName:10020 Failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
这个信息还看不出具体的问题所在，查看服务器上所有的日志,也没有看出问题，最后查看yarn的日志，看出问题所在。
根据调度系统，获取到ApplicationId：application_1638255473937_0568 ， 然后从hdfs上查看对应的日志信息。
查看yarn日志信息：
[hdfs@centos hadoop27]$ yarn logs -applicationId application_1638255473937_0568
关键报错信息：
org.apache.hadoop.ipc.remoteexception(org.apache.hadoop.hdfs.protocol.FSLimitException$MaxDirectoryItemsExceededException): The directory item limit of /tmp/hadoop-yarn/staging/history/done_intermediate/hdfs is exceeded: limit=1048576 items=1048576
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