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Posted to hdfs-dev@hadoop.apache.org by "Gera Shegalov (JIRA)" <ji...@apache.org> on 2014/05/28 02:44:01 UTC
[jira] [Created] (HDFS-6452) ConfiguredFailoverProxyProvider should
randomize currentProxyIndex on initialization
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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