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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (HDFS-14017) ObserverReadProxyProviderWithIPFailover does not quite work
Date Mon, 22 Oct 2018 23:01:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-14017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Chen Liang updated HDFS-14017:
    Comment: was deleted

(was: Post initial v001 patch for early review. Still missing unit test. The basic idea is
not to extend ObserverReadProxyProvider, because it is extending ConfiguredProxyProvider,
which is by itself self different from IP failover we are trying to support here.  The patch
here does not have the ProxyProvider doing any actual failover. Additionally I'm thinking
of making a more clear separation by also renaming ObserverReadProxyProvider to ObserverReadConfiguredProxyProvider.)

> ObserverReadProxyProviderWithIPFailover does not quite work
> -----------------------------------------------------------
>                 Key: HDFS-14017
>                 URL: https://issues.apache.org/jira/browse/HDFS-14017
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>            Priority: Major
> Currently {{ObserverReadProxyProviderWithIPFailover}} extends {{ObserverReadProxyProvider}},
and the only difference is changing the proxy factory to use {{IPFailoverProxyProvider}}.
However this is not enough because when calling constructor of {{ObserverReadProxyProvider}}
in super(...), the follow line:
> {code}
> nameNodeProxies = getProxyAddresses(uri,
>         HdfsClientConfigKeys.DFS_NAMENODE_RPC_ADDRESS_KEY);
> {code}
> will try to resolve the all configured NN addresses to do configured failover. But in
the case of IPFailover, this does not really apply. 

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