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From "Gera Shegalov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6452) ConfiguredFailoverProxyProvider should randomize currentProxyIndex on initialization
Date Wed, 28 May 2014 00:44:01 GMT
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.



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