Gera Shegalov created HDFS-6452: ----------------------------------- Summary: ConfiguredFailoverProxyProvider should randomize currentProxyIndex on initialization Key: HDFS-6452 URL: https://issues.apache.org/jira/browse/HDFS-6452 Project: Hadoop HDFS Issue Type: Improvement Components: ha, hdfs-client Affects Versions: 2.4.0 Reporter: Gera Shegalov Assignee: Gera Shegalov
We observe that the clients iterate proxies in the fixed order. Depending on the order of namenodes in dfs.ha.namenodes.<nameservice> (e.g. 'nn1,nn2') and the current standby (nn1), all the clients will hit nn1 first, and then failover to nn2. Chatting with [~lohit] we think we can simply select the initial value of {{currentProxyIndex}} randomly, and keep the logic of {{performFailover}} of iterating from left-to-right. This should halve the unnecessary load on standby NN. -- This message was sent by Atlassian JIRA (v6.2#6252)