Chen Liang created HDFS-14016:
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Summary: ObserverReadProxyProvider can never enable observer read
except in tests
Key: HDFS-14016
URL: https://issues.apache.org/jira/browse/HDFS-14016
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Chen Liang
Assignee: Chen Liang
Currently in {{ObserverReadProxyProvider#invoke}}, only when
{{observerReadEnabled && isRead(method)}} is true, the code will check whether
to talk to Observer. Otherwise always talk to active. The issue here is that
currently it can only be set through {{setObserverReadEnabled}}, which is used
by tests only. So observer read is always disabled in deployment and no way to
enable it. We may want to either expose a configuration key, or hard code it to
true so it can only be changed for testing purpose, or simply remove this
variable. This is closely related to HDFS-13923.
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