Elek, Marton created HDDS-1153:
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Summary: Make tracing instrumetntation configurable
Key: HDDS-1153
URL: https://issues.apache.org/jira/browse/HDDS-1153
Project: Hadoop Distributed Data Store
Issue Type: Sub-task
Reporter: Elek, Marton
TracingUtil.createProxy is a helper method to create a proxy instance with
tracing support.
The proxy instance implements the same interface as the original class and
delegates all the method calls to the original instance but it also sends
tracing information to the tracing server.
By default it's not a big overhead as the tracing libraries can be configured
to send tracing only with some low probability.
But to make it more safe we can make it optional. With a global
'hdds.tracing.enabled' configuration variable (can be true by default) we can
adjust the behavior of TracingUtil.createProxy.
If the tracing is disabled the TracingUtil.createProxy should return with the
'delegate' parameter instead of a proxy.
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