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https://issues.apache.org/jira/browse/HDFS-13782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16575694#comment-16575694
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Konstantin Shvachko commented on HDFS-13782:
--------------------------------------------
Some thoughts. Our main goal for ObserverReadProxyProvider (ORPP) is to provide
fail-over of ANN to SBN, when active fails. The main difference between
ConfiguredFailoverProxyProvider (CFPP) and IPFailoverProxyProvider (IFPP) is
that CFPP chooses another NN, and repeats until until fail-over succeeds. While
IFPP does nothing, because somebody else fails over the VIP.
ORPP should inherit the fail-over behavior of CFPP or IFPP depending on which
fail-over method is used. The remaining logic or ORPP working with Obervers
stays the same in both cases, since we do not allow failing-over directly to an
Observer. So I propose to add another generic parameter to ORPP, which will
define the underlying fail-over class and encapsulate a corresponding method.
{code}
public class ObserverReadProxyProvider<T extends ClientProtocol, F extends
FailoverProxyProvider<T>> {
private F failoverProxy;
...............
@Override
public void performFailover(T currentProxy) {
failoverProxy.performFailover(currentProxy);
}
}
{code}
Then we can use the respective classes:
{code}
public class ObserverReadProxyProviderWithConfiguredFailover<T extends
ClientProtocol, ConfiguredFailoverProxyProvider<T>> {}
public class ObserverReadProxyProviderWithIPFailover<T extends ClientProtocol,
IPFailoverProxyProvider<T>> {}
{code}
> ObserverReadProxyProvider should work with IPFailoverProxyProvider
> ------------------------------------------------------------------
>
> Key: HDFS-13782
> URL: https://issues.apache.org/jira/browse/HDFS-13782
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: test
> Reporter: Konstantin Shvachko
> Priority: Major
>
> Currently {{ObserverReadProxyProvider}} is based on
> {{ConfiguredFailoverProxyProvider}}. We should also be able perform SBN reads
> in case of {{IPFailoverProxyProvider}}.
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