Gera Shegalov created HDFS-6452:
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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.
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