Hari Sekhon created HDFS-8277: --------------------------------- Summary: Safemode enter fails when Standby NameNode is down Key: HDFS-8277 URL: https://issues.apache.org/jira/browse/HDFS-8277 Project: Hadoop HDFS Issue Type: Bug Components: ha, HDFS, namenode Affects Versions: 2.6.0 Environment: HDP 2.2.0 Reporter: Hari Sekhon
HDFS fails to enter safemode when the Standby NameNode is down (eg. due to AMBARI-10536). {code}hdfs dfsadmin -safemode enter safemode: Call From nn2/x.x.x.x to nn1:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused{code} This appears to be a bug in that it's not trying both NameNodes like the standard hdfs client code does, and is instead stopping after getting a connection refused from nn1 which is down. I verified normal hadoop fs writes and reads via cli did work at this time, using nn2. I happened to run this command as the hdfs user on nn2 which was the surviving Active NameNode. After I re-bootstrapped the Standby NN to fix it the command worked as expected again. Hari Sekhon http://www.linkedin.com/in/harisekhon -- This message was sent by Atlassian JIRA (v6.3.4#6332)