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https://issues.apache.org/jira/browse/HDDS-14769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Andika updated HDDS-14769:
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Summary: Client suggested leader failover mechanism does not work (was:
Suggested leader mechanism does not work)
> Client suggested leader failover mechanism does not work
> --------------------------------------------------------
>
> Key: HDDS-14769
> URL: https://issues.apache.org/jira/browse/HDDS-14769
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Ivan Andika
> Priority: Major
>
> When trying to improve testFailoverWithSuggestedLeader to validate whether
> the failover proxy actually failover directly to the suggested, I found
> suggested leader mechanism does not work (the test does not validate any
> client failover behavior). The client-side OMNotLeaderException leaderPeerId
> and leaderAddress are null even when the OM throws OMNotLeaderException with
> non-null leaderPeerId and leaderAddress.
> The issue is that currently RemoteException only supports "Exception(String)"
> constructor. See RemoteException#instantiateException used in
> RemoteException#unwrapRemoteException
>
> {code:java}
> private IOException instantiateException(Class<? extends IOException> cls)
> throws Exception {
> Constructor<? extends IOException> cn = cls.getConstructor(String.class);
> cn.setAccessible(true);
> IOException ex = cn.newInstance(this.getMessage());
> ex.initCause(this);
> return ex;
> } {code}
> This means the client always receives OMNotLeaderException without the
> suggested leader info.
>
> HADOOP-18816 attempted to introduce a way to reconstruct the actual exception
> which might be able to support suggested leader mechanism, but it has not
> moved forward for a long time.
> Alternatively, we can use some kind of regex to get the leader peer ID and
> leader address on the leader exception string. However, this can be fragile
> unless it's tested.
>
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